CN115096540B - Continuous wind tunnel mach number fine adjustment mechanism - Google Patents

Abstract

The invention relates to a continuous wind tunnel Mach number fine adjustment mechanism, and belongs to the technical field of aerodynamic force tests. The Mach number fine adjustment mechanism solves the problem that dead points exist in the existing Mach number fine adjustment mechanism during mechanical movement. Prolong board, preceding adjusting piece subassembly, back tail and prolong board and drive arrangement including preceding tail, preceding tail prolongs board, preceding adjusting piece subassembly, back tail and prolongs the board and articulate in order, drive arrangement establishes with preceding adjusting piece subassembly and is connected. The front adjusting sheet at the connecting hinge point in the device is driven by an electric cylinder, so that dead points can be avoided.

Description

Continuous wind tunnel mach number fine adjustment mechanism

Technical Field

The invention relates to a wind tunnel Mach number fine adjustment mechanism, and belongs to the technical field of aerodynamic tests.

Background

Wind tunnel, wind tunnel laboratory, is a pipe-shaped experimental facility which is used for generating and controlling airflow in a manual mode, is used for simulating the flowing condition of air around an aircraft or a solid, can measure the effect of the airflow on the solid and observe physical phenomena, and is one of the most common and effective tools for aerodynamic experiments. Wind tunnels are an indispensable important component in aerodynamic research and aircraft aerodynamic design work. The downstream of the test section of the wind tunnel is provided with two throats, and the Mach number fine adjustment mechanism needs to be arranged in the two throats and used for controlling a flow field. The prior Mach number fine adjustment mechanism usually realizes the adjustment function through a driving device arranged at the rear end, namely the Mach number fine adjustment mechanism is driven at the last group of hinge points, a dead point exists, a set of driving device is additionally arranged to slightly open a central body to enable the central body to leave the dead point position, then the central body is driven by an electric cylinder mainly pushed, or the central body is not completely closed, only a certain included angle state can be kept, clamping stagnation easily occurs, the adjustment on the sectional areas of two throat parts is influenced, the front and rear adjusting pieces are equal in length, the loss of the two throat sections is large, only the front adjusting piece is arranged in part of a wind tunnel, and the airflow is unstable.

Therefore, it is desirable to provide a continuous mach number fine tuning mechanism for wind tunnel to solve the above technical problem.

Disclosure of Invention

The Mach number fine adjustment mechanism solves the problem that dead points exist in the existing Mach number fine adjustment mechanism during mechanical movement. The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to determine the key or critical elements of the present invention, nor is it intended to limit the scope of the present invention.

The technical scheme of the invention is as follows:

the continuous wind tunnel Mach number fine adjustment mechanism comprises a front tail extension plate, a front adjusting plate assembly, a rear tail extension plate and a driving device, wherein the front tail extension plate, the front adjusting plate assembly, the rear adjusting plate assembly and the rear tail extension plate are sequentially hinged, and the driving device is connected with the front adjusting plate assembly.

Preferably: the front adjusting piece assembly comprises two symmetrically-arranged front adjusting pieces, the rear adjusting piece assembly comprises two symmetrically-arranged rear adjusting pieces, one ends of the two front adjusting pieces are hinged to the front tail extension plate, the other ends of the two front adjusting pieces are hinged to one ends of the two rear adjusting pieces correspondingly arranged, and the other ends of the two rear adjusting pieces are hinged to the rear tail extension plate.

Preferably: the two throat adjusting plates are hinged to the front tail extension plate through the rotating shaft, and two ends of the rotating shaft are connected with the two throat upper wall plates and the two throat lower wall plates respectively.

Preferably: the rear tail extension plate slideway comprises a first slideway and a second slideway, the first slideway and the second slideway are respectively arranged on two sides of the rear tail extension plate, so that the rear tail extension plate slideway is in sliding connection with the rear tail extension plate, and the first slideway and the second slideway are respectively connected with an upper wallboard of the two throats and a lower wallboard of the two throats.

Preferably: still include the connecting plate subassembly, the connecting plate subassembly includes connecting plate, slide and slider, the quantity of connecting plate, slide is equal two, and two connecting plates, the equal symmetry of two slides set up, and equal fixed mounting has the slider on two connecting plates, and the connecting plate is connected with preceding adjustment sheet, one side and two throat wallboard fixed connection of slide, the opposite side and the slider sliding connection of slide.

Preferably: the slide is arc.

Preferably: the number of the connecting plate assemblies is two, and the two connecting plate assemblies are respectively connected with the upper wall plates of the two throats and the lower wall plates of the two throats through slideways.

Preferably, the following components: the driving device comprises a pin boss, a pin shaft, an electric cylinder, a support pin shaft and a support, the support is fixedly connected with the two throat wallboards, the support is connected with a cylinder body of the electric cylinder through the support pin shaft, the output end of the electric cylinder is connected with the pin boss through the pin shaft, and the pin boss is fixedly connected with the connecting plate.

Preferably: the length of the rear adjusting sheet is three times that of the front adjusting sheet.

Preferably: and the rear adjusting sheet is provided with a pressure balancing hole.

The invention has the following beneficial effects:

1. the device adjusts the sectional area of the two throat parts in real time by controlling the opening and closing angle of the quadrangle through the driving device, thereby achieving the purpose of accurately controlling the flow field;

2. the slideway of the device is arc-shaped, so that the load bearing of the electric cylinder is reduced, the functions of guiding and bearing are achieved, and the stable opening and closing motion of the central body is ensured;

3. the connecting hinge point (front adjusting sheet) in the device is driven by an electric cylinder, so that dead points can be avoided;

4. the device arranges a row of pressure balance holes along the height direction (longitudinal direction in figure 1) of the rear adjusting sheet at the position of 81 percent L, reduces the aerodynamic force applied to the rear adjusting sheet of the quadrangular central body, balances the pressure difference between the inner and outer parts of the cavity of the central body, can reduce the power of the driving device, is convenient for the model selection of the motor, and reduces the cost.

Drawings

FIG. 1 is a front view of a continuous wind tunnel Mach number fine tuning mechanism;

FIG. 2 is a cross-sectional view taken along line B-B of FIG. 1;

FIG. 3 isbase:Sub>A cross-sectional view A-A of FIG. 1;

in the figure, 1-front tail extension plate, 2-front blade assembly, 3-rear blade assembly, 4-rear tail extension plate, 5-pin seat, 6-connecting plate, 7-pin shaft, 8-motor, 9-electric cylinder, 10-slide, 11-rotating shaft, 12-support pin shaft, 13-support, 14-slide, 15-rear tail extension plate slide, 16-two throat upper wall plate, 17-two throat lower wall plate, 18-67% L opening position, 19-81% L opening position, 20-94% L opening position, 21-wind tunnel axis, 22-two throat front end surface, 23-home position.

Detailed Description

In order that the objects, aspects and advantages of the invention will become more apparent, the invention will be described by way of example only, and in connection with the accompanying drawings. It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

The first specific implementation way is as follows: the continuous wind tunnel mach number fine adjustment mechanism is described with reference to fig. 1-3, and comprises a fronttail extension plate 1, a frontadjusting plate assembly 2, a rear adjusting plate assembly 3, a rear tail extension plate 4 and a driving device, wherein the fronttail extension plate 1, the frontadjusting plate assembly 2, the rear adjusting plate assembly 3 and the rear tail extension plate 4 are sequentially hinged, and the driving device is connected with the front adjustingplate assembly 2.

The second embodiment is as follows: the embodiment is described with reference to fig. 1 to 3, and the continuous wind tunnel mach number fine adjustment mechanism of the embodiment comprises a fronttail extension plate 1, a frontadjusting blade assembly 2, a rear adjusting blade assembly 3, a rear tail extension plate 4 and a driving device, wherein the fronttail extension plate 1, the frontadjusting blade assembly 2, the rear adjusting blade assembly 3 and the rear tail extension plate 4 are sequentially hinged, the driving device is connected with the front adjustingblade assembly 2, and the device is arranged in sealing covers of upper and lower wall plates of two throats; the front adjustingpiece assembly 2 comprises two front adjusting pieces which are symmetrically arranged, the rear adjusting piece assembly 3 comprises two rear adjusting pieces which are symmetrically arranged, one ends of the two front adjusting pieces are hinged with the fronttail extension plate 1, the other ends of the two front adjusting pieces are hinged with one ends of the two rear adjusting pieces which are correspondingly arranged, and the other ends of the two rear adjusting pieces are hinged with the rear tail extension plate 4; the throat adjusting device is characterized by further comprising arotating shaft 11, wherein one ends of the two front adjusting pieces are hinged with the fronttail extension plate 1 through the rotatingshaft 11, and two ends of the rotatingshaft 11 are respectively connected with the two throatupper wall plates 16 and the two throatlower wall plates 17; the rear tailextension plate slideway 15 comprises a first slideway and a second slideway, the first slideway and the second slideway are respectively arranged at two sides of the rear tail extension plate 4, so that the rear tailextension plate slideway 15 is in sliding connection with the rear tail extension plate 4, and the first slideway and the second slideway are respectively connected with two throatupper wall plates 16 and two throatlower wall plates 17; the Mach number fine adjustment mechanism is arranged in the two throats, the two front adjusting pieces and the two rear adjusting pieces form a quadrilateral central body, and the cross section area of the two throats is adjusted in real time by controlling the opening and closing angle of a quadrilateral through the driving device in the operation process of the wind tunnel, so that the aim of accurately controlling a flow field is fulfilled.

The third concrete implementation mode: the embodiment is described with reference to fig. 1 to 3, and the continuous wind tunnel mach number fine adjustment mechanism of the embodiment comprises a fronttail extension plate 1, a frontadjusting plate assembly 2, a rear adjusting plate assembly 3, a rear tail extension plate 4 and a driving device, wherein the fronttail extension plate 1, the frontadjusting plate assembly 2, the rear adjusting plate assembly 3 and the rear tail extension plate 4 are sequentially hinged, and the driving device is connected with the front adjustingplate assembly 2; the front adjustingpiece assembly 2 comprises two front adjusting pieces which are symmetrically arranged, the rear adjusting piece assembly 3 comprises two rear adjusting pieces which are symmetrically arranged, one ends of the two front adjusting pieces are hinged with the fronttail extension plate 1, the other ends of the two front adjusting pieces are hinged with one ends of the two rear adjusting pieces which are correspondingly arranged, and the other ends of the two rear adjusting pieces are hinged with the rear tail extension plate 4; the two front adjusting pieces rotate around the rotatingshaft 11 anticlockwise and clockwise respectively by controlling the telescopic amount of theelectric cylinder 9, so that the opening or closing is realized, and theelectric cylinder 9 swings around thesupport pin shaft 12 by a certain angle when theelectric cylinder 9 is telescopic; the rear tailextension plate slideway 15 comprises a first slideway and a second slideway, the first slideway and the second slideway are respectively arranged at two sides of the rear tail extension plate 4, so that the rear tailextension plate slideway 15 is in sliding connection with the rear tail extension plate 4, and the first slideway and the second slideway are respectively connected with two throatupper wall plates 16 and two throatlower wall plates 17; the connecting plate assembly comprises two connectingplates 6, twoslideways 10 and two sliding blocks 14, the two connectingplates 6 and the twoslideways 10 are symmetrically arranged, the sliding blocks 14 are fixedly mounted on the two connectingplates 6, the connectingplates 6 are connected with the front adjusting sheet, one sides of theslideways 10 are fixedly connected with the two throat wall plates, and the other sides of theslideways 10 are in sliding connection with the sliding blocks 14; theslideway 10 is arc-shaped, so that the load bearing of theelectric cylinder 9 is reduced, the functions of guiding and bearing are achieved, and the stable opening and closing movement of the central body is ensured; the number of the connecting plate assemblies is two, and the two groups of connecting plate assemblies are respectively connected with two throatupper wall plates 16 and two throatlower wall plates 17 throughslideways 10; the driving device comprises apin boss 5, a pin shaft 7, anelectric cylinder 9, asupport pin shaft 12 and asupport 13, wherein thesupport 13 is fixedly connected with two throat wall plates through bolts, thesupport 13 is connected with a cylinder body of theelectric cylinder 9 through thesupport pin shaft 12, a motor 8 is connected with theelectric cylinder 9, an output end of the motor 8 is connected with an input end of theelectric cylinder 9, an output end of theelectric cylinder 9 is connected with thepin boss 5 through the pin shaft 7, thepin boss 5 is fixedly connected with a connectingplate 6 through bolts, three hinge points are almost on the same straight line when a quadrilateral central body is closed, and the connecting hinge point in the device is driven by theelectric cylinder 9 and can avoid a dead point; the length of the rear adjusting sheet is three times that of the front adjusting sheet, and the extension of the rear adjusting sheet is beneficial to reducing the loss of the two throat sections and reducing the pressure ratio of the wind tunnel; the rear regulating blade is provided with pressure balance holes, the rear regulating blade is perforated at a position of 67%, 81% or 94% of the overall length in the horizontal length direction (from front to rear in the lateral direction in fig. 1), i.e., the overall length of the rear regulating blade is L, and the distance between the perforated position and the front end of the rear regulating blade is 67, 81 or 94%, the rear regulating blade is minimally stressed when perforated at the position of 81% L, and a row of pressure balance holes is arranged at the position of 81% L along the height direction (longitudinal direction in fig. 1) of the rear regulating blade, thereby reducing the aerodynamic force on the rear regulating blade of the quadrangular central body, balancing the difference between the internal and external pressures of the central body cavity, reducing the power of the driving device, facilitating the selection of the motor 8, and reducing the cost; the device can realize multiple functions of reducing the energy loss of the airflow, reducing the operation pressure ratio of the wind tunnel, stabilizing the airflow and the like.

See table 1 for a comparison of the force applied to the open cell sites:

TABLE 1 stress comparison of open hole locations

Location of the opening	67%L	81%L	94%L
				Rear adjusting plate force (N)	48236	2946	97378

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

For ease of description, spatially relative terms such as "over 8230 \ 8230;,"' over 8230;, \8230; upper surface "," above ", etc. may be used herein to describe the spatial relationship of one device or feature to another device or feature as shown in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary terms "at 8230; \8230; above" may include both orientations "at 8230; \8230; above" and "at 8230; \8230; below". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

It should be noted that, in the above embodiments, as long as the technical solutions can be aligned and combined without contradiction, those skilled in the art can exhaust all possibilities according to the mathematical knowledge of the alignment and combination, and therefore, the present invention does not describe the technical solutions after alignment and combination one by one, but it should be understood that the technical solutions after alignment and combination have been disclosed by the present invention.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (5)

1. A continuous wind tunnel Mach number fine-tuning mechanism is characterized in that: the device comprises a front tail extension plate (1), a front adjusting piece assembly (2), a rear adjusting piece assembly (3), a rear tail extension plate (4) and a driving device, wherein the front tail extension plate (1), the front adjusting piece assembly (2), the rear adjusting piece assembly (3) and the rear tail extension plate (4) are sequentially hinged, and the driving device is connected with the front adjusting piece assembly (2);

the front adjusting piece assembly (2) comprises two front adjusting pieces which are symmetrically arranged, the rear adjusting piece assembly (3) comprises two rear adjusting pieces which are symmetrically arranged, one ends of the two front adjusting pieces are hinged with the front tail extension plate (1), the other ends of the two front adjusting pieces are hinged with one ends of the two rear adjusting pieces which are correspondingly arranged, and the other ends of the two rear adjusting pieces are hinged with the rear tail extension plate (4);

the rear tail extension plate slideway (15) comprises a first slideway and a second slideway, the first slideway and the second slideway are respectively arranged at two sides of the rear tail extension plate (4), so that the rear tail extension plate slideway (15) is in sliding connection with the rear tail extension plate (4), and the first slideway and the second slideway are respectively connected with a second throat upper wall plate (16) and a second throat lower wall plate (17);

the connecting plate assembly comprises two connecting plates (6), two slideways (10) and sliding blocks (14), the two connecting plates (6) and the two slideways (10) are symmetrically arranged, the sliding blocks (14) are fixedly arranged on the two connecting plates (6), the connecting plates (6) are connected with the front adjusting sheet, one sides of the slideways (10) are fixedly connected with the two throat wall plates, and the other sides of the slideways (10) are in sliding connection with the sliding blocks (14);

the slideway (10) is arc-shaped;

the driving device comprises a pin boss (5), a pin shaft (7), an electric cylinder (9), a support pin shaft (12) and a support (13), the support (13) is fixedly connected with the two throat wall plates, the support (13) is connected with the cylinder body of the electric cylinder (9) through the support pin shaft (12), the output end of the electric cylinder (9) is connected with the pin boss (5) through the pin shaft (7), and the pin boss (5) is fixedly connected with the connecting plate (6).

2. The continuous wind tunnel mach number fine tuning mechanism of claim 1, characterized in that: the throat adjusting mechanism is characterized by further comprising a rotating shaft (11), one ends of the two front adjusting pieces are hinged to the front tail extension plate (1) through the rotating shaft (11), and two ends of the rotating shaft (11) are connected with the two throat upper wall plates (16) and the two throat lower wall plates (17) respectively.

3. The continuous wind tunnel mach number fine tuning mechanism of claim 1, characterized in that: the number of the connecting plate assemblies is two, and the two connecting plate assemblies are respectively connected with the two throat upper wall plates (16) and the two throat lower wall plates (17) through slideways (10).

4. The continuous wind tunnel mach number fine tuning mechanism of claim 1, characterized in that: the length of the rear adjusting sheet is three times that of the front adjusting sheet.

5. A continuous wind tunnel Mach number fine-tuning mechanism according to claim 1 or 4, characterized in that: and the rear adjusting sheet is provided with a pressure balancing hole.

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