CN101865786B - Experimental apparatus for measuring spray characteristics under low air pressure condition - Google Patents
Experimental apparatus for measuring spray characteristics under low air pressure conditionDownload PDFInfo
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- CN101865786B CN101865786BCN2010101652324ACN201010165232ACN101865786BCN 101865786 BCN101865786 BCN 101865786BCN 2010101652324 ACN2010101652324 ACN 2010101652324ACN 201010165232 ACN201010165232 ACN 201010165232ACN 101865786 BCN101865786 BCN 101865786B
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Abstract
Translated fromChineseDescription
Technical field
The invention belongs to safe and scientific and the engineering experiment equipment technical field, particularly under the low pressure condition, adopt the laser phase Doppler analyser to measure the experimental provision of spray characteristics.
Background technology
Infrabar is present under the multiple environmental baselines such as plateau, high-altitude, vaccum-pumping equipment.Water Mist Fire Extinguishing Technique has that fire extinguishing is efficient, environmentally safe, to plurality of advantages such as field staff and device security, water consumption are few, a large amount of work has been carried out in the research of its extinguishing property under condition of normal pressure, and has been widely used.But still lack the research work aspect the thin water smoke characteristic present under low air pressure condition so far, more do not see the analogue experiment installation that is suitable for thin water smoke mist droplet particle size and speed under normal pressure ground region measurement low air pressure condition." fire science and technology " magazine (2005; 24 (6): 733-734) introduced the advantage and the limitation of notion, extinguishing mechanism, control mode and the utilization in the historical relic ancient building of water mist system, but do not seen the research that relates under the low pressure condition thin water smoke mist field characteristic." atmospheric environment-A " magazine (1991; 25 (2): 217-230) introduced under environment under low pressure research, but do not seen atomization characteristics such as relating to thin water smoke atomizing angle, atomized drop diameter to the aspects such as chemical composition, temperature, transmission speed and direction of 97 kinds of different water smoke samples." the high altitude low air pressure condition is to the experimental study of fine mist fire-fighting performance impact " (Cai Xin, 2009.05; China Science & Technology University's PhD dissertation) introduced the thin water smoke mist characteristic research under the low pressure condition in, but its only adopted collecting method and laser sheet optical image-forming method Measurement and analysis low air pressure condition to the spray influence of subtended angle and droplet space distribution thereof of thin water smoke.And from Water Mist Fire Extinguishing Technique applying at hypobaric; Special is the historical relic ancient building of representative with Potala Palace like Tibet; And the fire protection of aerospace vehicle such as spaceship and the optimal design of corresponding fire extinguishing system thereof, need badly thin water smoke in the Measurement and analysis that experimentizes of the spray characteristics under the low air pressure condition.But lack the experimental provision of measuring thin water smoke characteristic under the low pressure condition at present, existing large laser measuring system also is unwell on aerospace vehicle to be used.
" multiphase fluid measurements test method " (polyphasic flow technology; 1994; 20:261-295) introduced the technological standard of laser phase Doppler measurement (PDA); This is a kind of optical measuring technique that the particle diameter and the speed of particle are carried out synchro measure, is made up of laser instrument, transmitting probe, signal processor and computing machine.The laser instrument emitted laser is passed through two mutually perpendicular transmitting probes, two mutually perpendicular first transparent windows and second transparent window Vertical Launch on the vacuum chamber wall respectively after the reference color pulser filters; Laser signal at the vacuum chamber inner focusing after spray particle amplifies and the refraction back is received by photodetector through the 3rd transparent window; Received laser signal through Transmission Fibers is consistent with tone set appearance after; A part of signal wherein is through Transmission Fibers entering signal processor; Data processing software deal with data on computing machine, the remainder signal gets into reference color pulser, recycle.But according to retrieval, only retrieve the document that under condition of normal pressure, utilizes the thin water smoke mist characteristic of PDA commercial measurement, do not see pertinent literature and the patent of utilizing PDA commercial measurement thin water smoke mist characteristic under low air pressure condition as yet domestic and foreign literature and patent.
Summary of the invention
The purpose of this invention is to provide a kind of experimental provision that adopts the laser phase Doppler measuring technique to measure spray characteristics under low air pressure condition, for characteristics such as thin water smoke mist field distribution under the research low air pressure condition, mist droplet particle size and droplet velocity distribution provide condition guarantee.
Employing laser phase Doppler of the present invention is measured the experimental provision of thin water smoke characteristic under the low air pressure condition, comprises that wall is provided with the airtight vacuum chamber of aspirating hole and pressure vacuum gauge, and said aspirating hole links to each other with vacuum pump through first pipeline that has first valve; The vacuum chamber top is provided with fine mist spray head, and this fine mist spray head links to each other with water system through second pipeline that has second valve; In the laser phase Doppler measuring system of forming by laser instrument, transmitting probe, signal processor and computing machine; The laser that emits from laser instrument passes through two mutually perpendicular transmitting probes respectively to two mutually perpendicular first, second transparent window Vertical Launch after the reference color pulser filters; Behind the vacuum chamber inner focusing, received by the laser pick-off probe through the 3rd transparent window; Received laser signal obtains the metrical information of desired parameters through Transmission Fibers entering signal processor after the Doppler measurement data processing software that is equipped with on the computing machine is handled; It is characterized in that: the internal thread outer fissure slot type structure that is complementary with vacuum chamber outside wall surface shape is adopted in the window pedestal junction that is welded on the vacuum chamber outside wall surface; The glass of said three transparent windows blocks respectively in the plough groove type structure of slotting and the window pedestal of closed set on being welded on the vacuum chamber outside wall surface; Form easily detachable internal cavity formula structure; The central point of these three transparent windows is on same horizontal circle side face; Each window plane is parallel with vacuum chamber outside wall surface tangent plane; Wherein the first transparent window in-plane and the second transparent window in-plane are orthogonal, and the 3rd transparent window in-plane matches with respect to the angle of the first transparent window in-plane and the angle that is become with second transparent window and Laser emission, the receiving angle of laser phase Doppler detector; The clamping hoop type joint is adopted in the junction of fine mist spray head and water system pipeline, and this clamping hoop type joint is made up of two circular flanges up and down: upper flange and above-mentioned second pipeline link together, and the xsect of upper flange is stepped, matches with the pipe clamp of clip; The shape on lower flange top and the pipe clamp of clip match, and bottom and vacuum chamber link together; Vacuum chamber bottom is provided with the outstanding liquid pipeline section that holds downwards, and this holds the liquid pipeline section through the 3rd valve and atmosphere.
Said vacuum chamber can be selected hollow ball, right cylinder or rectangular cylinder for use; Can adopt transparent pressure-resistant material manufacturing, or adopt nontransparent pressure-resistant material manufacturing and leave transparent window in the relevant position of laser process; It is to see through laser and the needs that receive laser on the one hand that transparent window is set, and also helps experimental phenomena and process are carried out observational record simultaneously; And can change the limit experimental pressure in the vacuum chamber through the transparent material of selecting, change different withstand voltages for use.
The present invention has adopted the clamping hoop type joint in the junction of fine mist spray head and water system pipeline; It is convenient to make in the experimentation replacing of shower nozzle install; And do not influence one-piece construction and sealing requirements, help the sprayability of different shower nozzles under the testing research low air pressure condition.
In order to reduce water smoke to the influence of window glass with avoid the influence of sidewall ponding to laser acquisition, the upper edge of each transparent window can be provided with and be inclined upwardly and the acutangulate dash shield of vacuum chamber inwall; Whether and the acclivitous angle and the length of stretching out window the employing of this dash shield; The height, spray cone angle and the shower nozzle negative pressure cylinder intracoelomic cavity size that are provided with the size of vacuum chamber cavity diameter, fine mist spray head are relevant: if the vacuum chamber cavity diameter is enough big, the height of fine mist spray head setting enough height, spray cone angle is enough little or shower nozzle negative pressure cylinder intracoelomic cavity size enough can not be ejected into the cavity inner wall face down to droplet greatly; Influence the problem of window measurement with regard to the trickling of wall condensate can not take place, this shield also just need not to stretch out window does not in this case even need it too much yet.
For the secondary water smoke of avoiding the collision of water smoke and cavity inner wall to produce impacts window, can keep 10-20 centimetre distance between cavity bottom and the laser focusing point; It is in order to reduce the liquid sputter that said vacuum chamber bottom is established the flange arrangement that stretches out downwards; This flange bottom is connected through the drainpipe of thimble connector with the may command water discharge that the 3rd valve is housed, and taking the clamp connection mode here is in order to ensure inner chamber not only salable but also thoroughly draining.
Each transparent window among the present invention is provided with; Taked the internal thread outer fissure slot type structure that is complementary with vacuum chamber outside wall surface shape; The glass of each transparent window blocks respectively in the plough groove type of slotting and the window pedestal of closed set on the vacuum chamber outside wall surface; Form quick detachable structure, the convenience of operation such as clean window during with the reliability that guarantees sealing and installation, experiment.Quick detachable structure is the replacing of window glass for ease not only, also makes simultaneously to research and analyse different glass the influence and the correction of measurement result become possibility.The internal cavity formula structure that each transparent window is taked has guaranteed when window glass is installed with respect to the adjustability of laser angle and has guaranteed laser vertical incident, thereby avoids the glass refraction of light to be caused the deviation of focal position.
When beginning to test, whether each valve of inspection all closes earlier; Open first valve and the vacuum pump that link to each other with aspirating hole then, when data presented satisfies experiment condition on the pressure vacuum gauge, first valve of closing vacuum pump and linking to each other with aspirating hole; Open second valve and the water system that link to each other with fine mist spray head; Open laser phase Doppler measuring system (PDA); The mutually perpendicular laser of two bundles that the laser instrument transmitting probe sends gets into vacuum chamber through two mutually perpendicular transparent windows respectively; Pass water smoke in vacuum chamber after the point focusing; Produce interference fringe and after the amplification of spray particle and scattering through the 3rd transparent window by the reception of laser pick-off probe; Received laser signal obtains required mist characteristic data through Transmission Fibers entering signal processor after the Doppler measurement data processing software that is equipped with on the computing machine is handled; Data acquisition is closed laser phase Doppler measuring system (PDA) and water system after accomplishing successively, closes all valves, opens the 3rd valve of drainpipe, discharges ponding.
The present invention utilizes existing laser phase Doppler to measure (PDA) technology; Specifically combine with the airtight withstand voltage vacuum chamber that has vacuum pump and thin water smoke occurrence condition; Creatively adopt clamping hoop type jointing, the quick detachable structure of internal thread outer fissure slot type and internal cavity formula structure, thereby realized experiment measuring at spray characteristics under low air pressure condition.Adopt experimental provision of the present invention can be implemented under the low pressure condition in 0.1～1 barometric pressure range spray characteristics is carried out measurement Research; Not only can do the spray characteristics experiment of clear water, also can do the water smoke characteristic test that contains adjuvant, also can measure the spray characteristics of media such as fuel oil, spray paint and measure.Fine mist spray head in the experimental provision of the present invention can select to adopt 7 hole shower nozzles or 5 hole shower nozzles or other porous nozzle, and the shower nozzle with different flow coefficient, thereby can measure the spray characteristics of all kinds of different shower nozzles under low air pressure condition.
Compare with existing method and the device of measuring spray characteristics, the present invention has overcome the difficulty that existing measuring method and device can't realize under the low air pressure condition spray characteristics is carried out measurement Research; Compare with the mist field picture diagnostic method that adopts in " the high altitude low air pressure condition is to the experimental study of fine mist fire-fighting performance impact " based on laser sheet optical; The laser phase Doppler that experimental provision of the present invention adopts is measured (PDA) technology can measure a plurality of parameters such as obtaining mist droplet particle size, velocity distribution and mist flux simultaneously, and has higher precision.
Description of drawings
Fig. 1 is the spherical vacuum chamber example structure synoptic diagram of the present invention's experimental provision of adopting PDA commercial measurement spray characteristics under low air pressure condition.
Fig. 2 is the structural section synoptic diagram of the clamping hoop type joint of the present invention's experimental provision of adopting PDA commercial measurement spray characteristics under low air pressure condition.
Fig. 3 is the joint schematic cross-section of the internal thread outer fissure slot type structure of the present invention's experimental provision of adopting PDA commercial measurement spray characteristics under low air pressure condition.
Fig. 4 is the PDA measuring system example structure synoptic diagram of the present invention's experimental provision of adopting PDA commercial measurement spray characteristics under low air pressure condition.
Fig. 5 is the cylindrical vacuum chamber example structure synoptic diagram of the present invention's experimental provision of adopting PDA commercial measurement spray characteristics under low air pressure condition.
Embodiment
Embodiment 1:
The spherical vacuum chamber experimental provision of the experimental provision of present embodiment employing PDA commercial measurement spray characteristics under low air pressure condition is as shown in Figure 1: this experimental provision comprises that wall is provided with the airtight vacuum chamber of aspirating hole and pressure vacuum gauge, and thevacuum chamber 13 in the present embodiment is made up of upper and lower two stainless steel hollow hemisphere body and function bolts and rubber sheet gasket fixing seal; Said aspirating hole links to each other with vacuum pump S2 throughfirst pipeline 16 that hasfirst valve 5; The top ofvacuum chamber 13 is provided with finemist spray head 3, and this finemist spray head 3 is connected with water system S1 throughsecond pipeline 2 that hassecond valve 4;Vacuum chamber 13 center of top are installed withsecond pipeline 2 that is connected with water system S1 throughtop flange 15; Fixing between the flange plate throughthimble connector 21; With replacing fine mist spray head for convenience detach,second valve 4 is arranged betweensecond pipeline 2 and the water system S1.Second pipeline, 2 lower ends adopt clampinghoop type joint 21 that finemist spray head 3 is installed nearvacuum chamber 13 tops,
On the wall of the both sides ofsecond pipeline 2 atvacuum chamber 13 tops, be separately installed with the pressure vacuum gauge 1 andfirst pipeline 16; Pressure vacuum gauge 1 is fixed on the outer wall ofvacuum chamber 13 through screwed pipe joint, andfirst pipeline 16 that is welded onvacuum chamber 13 walls links to each other with vacuum pump S2 throughfirst valve 5.
Fig. 2 is the structural section synoptic diagram of the clamping hoop type joint that design is adopted among the present invention: this joint is made up of twocircular flanges upper flange 21 andsecond pipeline 2 weld together; The lower end ofsecond pipeline 2 connects finemist spray head 3; The xsect ofupper flange 21 is stepped, matches with the pipe clamp of clip; The shape onlower flange 22 tops and the pipe clamp of clip match, and bottom and vacuum chamber weld together.This structure makes in experimentation, to be convenient to change installs different shower nozzles, and does not influence one-piece construction and sealing requirements, helps the sprayability of different shower nozzles under the testing research low air pressure condition.
Wall bottom nearhemisphere seam 14 has three transparent windows: the in-plane of the in-plane of firsttransparent window 9 and secondtransparent window 7 orthogonal; The in-plane of the 3rdtransparent window 6 becomes 120 degree angles in the clockwise direction with respect to the in-plane of firsttransparent window 9; With 7 one-tenth 30 degree of second transparent window angle; Joint 20 through internal thread outer fissure slot type structure is fixed on the outer mural margin of transparent window to good transmittance and the very little Pyrex 8 of Stimulated Light influence withpad 23, and the central point of these three transparent windows is on same surface level circumference.
Fig. 3 is joint 20 schematic cross-sections of the internal thread outer fissure slot type structure that design is adopted among the present invention: in thegroove 24 of this joint with the slotting also window pedestal of closed set on the vacuum chamber outside wall surface of glass card, form easily detachable internal cavity formula structure.The convenience of operation such as clean window when guaranteeing reliability and installation, the experiment of sealing.Quick detachable structure is the replacing of window glass for ease not only, also makes simultaneously to research and analyse different glass the influence and the correction of measurement result become possibility.When having guaranteed that window glass is installed, internal cavity formula structure with respect to the adjustability of laser angle and guarantee laser vertical incident, avoid the glass refraction of light to be caused the deviation of focal position.
Influence measurement result on the transparent window for preventing that droplet on the inwall is slipped to, being provided with on the internal face top of above-mentioned three transparent window upper edges is inclined upwardly becomes 45 with the vacuum chamber inwall thebaffle plate 17 and the two ends ofbaffle plate 17 are respectively than the outstanding 2cm of window edge.With three same surface levels of transparent window on, and be respectively the PDA measuring system that placement on the vacuum chamber position outward at 10cm place comprises data acquisition and disposal system from the distance of firsttransparent window 9 and secondtransparent window 7.
Bottom central atvacuum chamber 13 is welded with diameter 20cm, and outstanding downwards 5cm holdsliquid pipeline section 12, and this holdsliquid pipe 12 through the3rd valve 10 and atmosphere.
Consider the stability ofvacuum chamber 13, also the convenience in order to test is provided withsupport 18 to support vacuum chamber below vacuum chamber.
Water system adopts tap water in the present embodiment, and shower nozzle is 7 hole shower nozzles, and laser instrument is an Argon ion laser.
During experiment, whether each valve of inspection all closes earlier, opensfirst valve 5 that links to each other with aspirating hole, starts vacuum pump S2, when data presented satisfies experiment condition to pressure vacuum gauge 1, closes vacuum pump S2 andfirst valve 5 that links to each other with aspirating hole; Opensecond valve 4 and water system S1 that links to each other with fine mist spray head, finemist spray head 3 beginning atomized water sprays; Postpone a period of time, wait the water smoke disperse to open after, open PDA measuring system S3.
Fig. 4 is the PDA measuring system example structure synoptic diagram of the present invention's experimental provision of adopting PDA commercial measurement spray characteristics under low air pressure condition:
Laser instrument m4 emitted laser is after reference color pulser m5 filters; The vertical laser of two bundles through two transmitting probe m6a and m6b emission gets intovacuum chamber 13 through first, second two mutually perpendiculartransparent windows transparent window 6 after the droplet particle amplifies and reflects is received; Through Transmission Fibers m3, consistent appearance m8 and the wave filter m9 entering signal processor m10 of setting of tone, write down and print the mist characteristic data attransparent window 6 places through computing machine m11 then; Data acquisition is accomplished, and closes PDA measuring system S3 and water system S1 successively, closes all valves, opens the3rd valve 10 of drainpipe, discharges ponding.
Embodiment 2:
Fig. 5 adopts the structural representation of the cylindrical vacuum chamber experimental provision of thin water smoke characteristic under the PDA commercial measurement low air pressure condition for present embodiment; Wall in thisvacuum chamber 13 adopts stainless steel; The bottom surface diameter is 60cm, highly is 69cm, and what three windows were installed is transparent toughened glass.
On the wall at 20cm place,vacuum chamber 13 bottom, having three transparent windows: the in-plane of the in-plane of firsttransparent window 9 and secondtransparent window 7 is orthogonal; The in-plane of the 3rdtransparent window 6 becomes 120 degree angles in the clockwise direction with respect to the in-plane of firsttransparent window 9, with 7 one-tenth 30 degree of second transparent window angle; Joint 20 through internal thread outer fissure slot type structure is fixed on the outer mural margin of transparent window to good transmittance and the very little Pyrex 8 of Stimulated Light influence withpad 23, and the central point of these three transparent windows is on same surface level circumference.
In thegroove 24 of thejoint 20 of the internal thread outer fissure slot type structure that adopts with the slotting also window pedestal of closed set on the vacuum chamber outside wall surface of glass card, form easily detachable internal cavity formula structure.The convenience of operation such as clean window when guaranteeing reliability and installation, the experiment of sealing.Quick detachable structure is the replacing of window glass for ease not only, also makes simultaneously to research and analyse different glass the influence and the correction of measurement result become possibility.Internal cavity formula structure has guaranteed when window glass is installed with respect to the adjustability of laser angle and has guaranteed laser vertical incident, avoids the glass refraction of light to be caused the deviation of focal position.
Influence measurement result on the transparent window for preventing that droplet on the inwall is slipped to; Being provided with on the internal face top of above-mentioned three transparent window upper edges is inclined upwardly becomes 30 ° of angles with the vacuum chamber inwall thebaffle plate 17 and the two ends ofbaffle plate 17 are respectively than the outstanding 2cm of window edge; With three same surface levels of transparent window on, and be respectively the PDA measuring system that placement on the vacuum chamber position outward at 10cm place comprises data acquisition and disposal system from the distance of firsttransparent window 9 and secondtransparent window 7.
Bottom central atvacuum chamber 13 has a diameter 20cm, and outstanding downwards 5cm holdsliquid pipeline section 12, is fixed together with drainage pipeline through flange in the bottom 11 and bolt, passes through the3rd valve 10 and atmosphere on the drainage pipeline.
Be provided withsupport 18 below the vacuum chamber to support vacuum chamber.
Water system adopts the tap water that adjuvant (like NaCl, KCl) arranged in the present embodiment, and shower nozzle is 5 hole shower nozzles, and what laser instrument adopted is crystal optical-fibre laser device.
During experiment, whether each valve of inspection all closes earlier, opensfirst valve 5 that links to each other with aspirating hole, starts vacuum pump S2, when data presented satisfies experiment condition to pressure vacuum gauge 1, closes vacuum pump S2 andfirst valve 5 that links to each other with aspirating hole; Opensecond valve 4 and water system S1 that links to each other with fine mist spray head, finemist spray head 3 beginning atomized water sprays; Postpone a period of time, wait the water smoke disperse to open after, open PDA measuring system S3.
Laser instrument m4 emitted laser is after reference color pulser m5 filters; The vertical laser of two bundles through two transmitting probe m6a and m6b emission gets intovacuum chamber 13 through first, second two mutually perpendiculartransparent windows transparent window 6 after the droplet particle amplifies and reflects is received; Through Transmission Fibers m3, consistent appearance m8 and the wave filter m9 entering signal processor m10 of setting of tone, write down and print the mist characteristic data attransparent window 6 places through computing machine m11 then; Data acquisition is accomplished, and closes PDA measuring system S3 and water system S1 successively, closes all valves, opens the3rd valve 10 of drainpipe, discharges ponding.
Experimental provision of the present invention, its vacuum chamber also can adopt the stainless steel cuboid, at the wall middle part of vacuum chamber wall the transparent observing window is set.
Claims (3)
1. an experimental provision that adopts laser phase Doppler to measure thin water smoke characteristic under the low air pressure condition comprises that wall is provided with the airtight vacuum chamber of aspirating hole and pressure vacuum gauge, and said aspirating hole links to each other with vacuum pump through first pipeline that has first valve; The vacuum chamber top is provided with fine mist spray head, and this fine mist spray head links to each other with water system through second pipeline that has second valve; In the laser phase Doppler measuring system of forming by laser instrument, transmitting probe, signal processor and computing machine; The laser that emits from laser instrument passes through two mutually perpendicular transmitting probes respectively to two mutually perpendicular first, second transparent window Vertical Launch after the reference color pulser filters; Behind the vacuum chamber inner focusing, received by the laser pick-off probe through the 3rd transparent window; Received laser signal obtains the metrical information of desired parameters through Transmission Fibers entering signal processor after the Doppler measurement data processing software that is equipped with on the computing machine is handled; It is characterized in that: the internal thread outer fissure slot type structure that is complementary with vacuum chamber outside wall surface shape is adopted in the window pedestal junction that is welded on the vacuum chamber outside wall surface; The glass of said three transparent windows blocks respectively in the plough groove type structure of slotting and the window pedestal of closed set on being welded on the vacuum chamber outside wall surface; Form easily detachable internal cavity formula structure; The central point of these three transparent windows is on same horizontal circle side face; Each window plane is parallel with vacuum chamber outside wall surface tangent plane; Wherein the first transparent window in-plane and the second transparent window in-plane are orthogonal, and the 3rd transparent window in-plane matches with respect to the angle of the first transparent window in-plane and the angle that is become with second transparent window and Laser emission, the receiving angle of laser phase Doppler detector; The clamping hoop type joint is adopted in the junction of fine mist spray head and water system pipeline, and this clamping hoop type joint is made up of two circular flanges up and down: upper flange and above-mentioned second pipeline link together, and the xsect of upper flange is stepped, matches with the pipe clamp of clip; The shape on lower flange top and the pipe clamp of clip match, and bottom and vacuum chamber link together; Vacuum chamber bottom is provided with the outstanding liquid pipeline section that holds downwards, and this holds the liquid pipeline section through the 3rd valve and atmosphere.
2. measure the experimental provision of spray characteristics under low air pressure condition according to claim 1, be characterised in that said vacuum chamber selects hollow ball, cylindrical or rectangular cylindrical body for use; By transparent pressure-resistant material manufacturing, or be provided with transparent window in the relevant position of laser process by nontransparent pressure-resistant material manufacturing.
3. measure the experimental provision of spray characteristics under low air pressure condition according to claim 1, be characterised in that each transparent window upper edge is provided with to be inclined upwardly and the acutangulate dash shield of vacuum chamber inwall.
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| CN102506765B (en)* | 2011-10-21 | 2014-03-26 | 中国航空动力机械研究所 | Device for measuring spray cone angle |
| CN104089651A (en)* | 2014-07-06 | 2014-10-08 | 长春理工大学 | Smog environment simulation device for testing polarization laser transmission features |
| CN110146266B (en)* | 2019-05-21 | 2021-04-02 | 中国民用航空飞行学院 | Method for testing flow coefficient of high-pressure water mist spray head of hangar |
| CN115201151B (en)* | 2022-07-25 | 2025-04-29 | 北京航空航天大学 | A fuel atomization performance testing device |
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