Propeller blade angle measuring device for wind tunnel test

Abstract

The invention discloses a propeller blade angle measuring device for a wind tunnel test. One end of a support plate is a reference positioning end matched with an upper propeller shell of a propeller; the scale plate is vertically connected to one end, far away from the reference positioning end, of the support plate and is provided with scale marks, and one surface, opposite to a connecting surface of the support plate and the scale plate, of the support plate is a horizontal reference surface; one end of the measuring plate is rotationally connected to the scale plate, the rotating angle of the measuring plate is calibrated through scale marks on the scale plate, the measuring plate is locked on the scale plate through a fastener so as to lock the rotating angle of the measuring plate, and meanwhile the end, away from the scale plate, of the measuring plate is provided with a positioning groove matched with a to-be-measured paddle in shape. And a measurement matching end face is limited. The invention discloses a propeller blade angle measuring device for a wind tunnel test. The propeller blade angle measuring device can quickly detect whether an adjusted blade angle reaches a target angle value or not.

Description

Technical Field

[0001] The present invention relates to the technical field of propeller wind tunnel tests, and more specifically, to a propeller blade angle measuring device for wind tunnel tests. Background Art

[0002] For the design of aircraft, since wind tunnel tests can help designers understand the aerodynamic performance of the propellers of aircraft under various conditions and provide important data support for the final design of aircraft, propeller wind tunnel tests are indispensable.

[0003] During the process of conducting propeller wind tunnel tests, when conducting wind tunnel tests on the external shape performance of propeller blades, it is necessary to change different blade angles during the tests.

[0004] Currently, when adjusting the blade angle, it is necessary to rotate the blade multiple times to rotate the blade to the target angle value. And during each rotation of the blade, a protractor is required to measure the blade angle until the measured value of the protractor reaches the target angle value when the blade is rotated for the last time and then stop. Moreover, each blade angle needs to be measured in this way, which makes the process of measuring the blade angle rather cumbersome.

[0005] Therefore, how to provide a propeller blade angle measuring device for wind tunnel tests that can quickly measure the blade angle is a technical problem that those skilled in the art urgently need to solve. Summary of the Invention

[0006] In view of this, the present invention provides a propeller blade angle measuring device for wind tunnel tests, which can quickly detect whether the adjusted blade angle reaches the target angle value.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A propeller blade angle measuring device for wind tunnel tests, comprising:

[0009] A support plate, one end of the support plate is a reference positioning end for mating with the upper propeller housing of the propeller;

[0010] A scale plate, the scale plate is vertically connected to the end of the support plate away from the reference positioning end, and the scale plate has scale lines. At the same time, the side of the support plate opposite to the connection surface of the support plate and the scale plate is a horizontal reference plane;

[0011] A measuring plate, one end of which is rotatably connected to the scale plate, and the rotation angle of the measuring plate is calibrated by the scale lines on the scale plate. The measuring plate is locked on the scale plate by a fastener to lock the rotation angle of the measuring plate. At the same time, a positioning groove matching the shape of the blade to be measured is provided at one end of the measuring plate away from the scale plate, and a measuring mating end face is defined.

[0012] By adopting the above technical solution of the present application, the beneficial effects achieved are as follows: By rotating the measuring plate, when the included angle between the plane where the measuring mating end face is located and the plane where the platform is located reaches a set value under the measurement of the angle measuring instrument, the measuring plate can be locked at this angle by a fastener. Thus, when rotating the blade, it is only necessary to observe whether the outer contour of the blade fits the positioning groove to determine that the blade has rotated to this set value. The operation is convenient, and the other multiple blades can also be fitted and compared with this positioning groove, so that the rotation of multiple blades to this set value can be quickly measured.

[0013] Preferably, an arc-shaped positioning groove matching the upper blade housing is provided at one end of the support plate away from the scale plate to form the reference positioning end.

[0014] By adopting the above technical solution of the present application, the beneficial effects achieved are as follows: By buckling the arc-shaped positioning groove on the outer edge of the upper blade housing of the bolt blade, a connection can be established between the present application and the propeller to be measured, thereby providing a measurement reference for the measurement of the present application.

[0015] Preferably, a positioning pin is connected to the bottom of the arc-shaped positioning groove, and a positioning hole is provided on the side wall of the upper blade housing, and the positioning pin is inserted into the positioning hole.

[0016] By adopting the above technical solution of the present application, the beneficial effects achieved are as follows: Through the cooperation between the positioning pin and the positioning hole, during the measurement of the present application, the stability of the cooperation between the reference positioning end on the support plate of the present application and the upper blade housing of the propeller can be improved, so that the present application is not likely to shake relative to the propeller during the measurement process, which is beneficial to improving the measurement accuracy of the present application.

[0017] Preferably, an arc-shaped limiting groove is provided on one surface of the scale plate, and the open end of the arc-shaped limiting groove extends to the end of the scale plate away from the support plate;

[0018] The measuring plate is arched and is embedded in the arc-shaped limiting groove. The arc-shaped surface of the measuring plate fits the inner wall of the arc-shaped limiting groove and can rotate in the arc-shaped limiting groove. At the same time, the flat end of the measuring plate is the measuring mating end face, and the positioning groove is provided.

[0019] With the above technical solution adopted in this application, the arc-shaped limiting groove provides guidance for the rotation of the measuring plate, thereby improving the accuracy of the rotation of the measuring plate relative to the scale plate.

[0020] Preferably, an arc-shaped hole penetrates through the bottom of the arc-shaped limiting groove, and the arc-shaped hole is concentrically arranged with the arc-shaped limiting groove and has the same radian, and both ends of the arc-shaped hole are closed ends;

[0021] At the position corresponding to the arc-shaped hole on the measuring plate, a plurality of positioning through holes penetrate through, and the plurality of positioning through holes are arranged at intervals along the length direction of the arc-shaped hole, and each of the positioning through holes is connected with the fastener, and at the same time each fastener passes through the arc-shaped hole and can move along its length direction in the arc-shaped hole and can be locked on the scale plate.

[0022] With the above technical solution adopted in this application, the rotation angle of the measuring plate can be adjusted and the measuring plate can be locked at this angle, so that different preset blade angles can be adjusted in this application, thereby being suitable for measuring the blade rotation angles of different sizes.

[0023] Preferably, it further includes: a plurality of adjusting screws and a plurality of adjusting nuts threadedly connected to the plurality of adjusting screws one by one;

[0024] One end of the scale plate away from the measuring plate is vertically bent to form a mounting portion, and one end of the support plate away from the reference positioning end is lapped on the mounting portion. At the same time, a plurality of strip-shaped through holes penetrate through the mounting portion, and the length of each strip-shaped through hole extends along the width direction of the mounting portion, and a plurality of mounting through holes corresponding to the plurality of strip-shaped through holes in one-to-one correspondence penetrate through one end of the support plate away from the reference positioning end;

[0025] The tail ends of the plurality of adjusting screws pass through the plurality of mounting through holes one by one, and the tail end of each adjusting screw passes through the corresponding strip-shaped through hole and is bolted to the corresponding adjusting nut. At the same time, the head diameter of each adjusting screw is larger than the aperture of the corresponding mounting through hole to be limited on the support plate, and the diameter of each adjusting nut is larger than the width of the corresponding strip-shaped through hole to be limited on the mounting portion.

[0026] With the above technical solution adopted in this application, the airfoil of the blade is made to have a higher degree of fit with the positioning groove in the blade span direction.

[0027] Preferably, it further includes: a gasket, and the gasket is clamped in the lapping gap between one end of the support plate away from the reference positioning end and the mounting portion.

[0028] With the above technical solution adopted in this application, the airfoil of the blade is made to have a higher degree of fit with the positioning groove in the axial direction of the blade shaft.

[0029] As can be seen from the above technical solutions, compared with the prior art, the present invention discloses a propeller blade angle measuring device for wind tunnel tests, which can achieve the following technical effects:

[0030] In this application, by rotating the measuring plate, when the angle between the plane where the measuring mating end face is located and the plane where the platform is located reaches a set value under the measurement of the angle measuring instrument, the measuring plate can be locked at this angle by a fastener. Thus, when the blade is rotated, it is only necessary to observe whether the outer contour of the blade fits the positioning groove to determine that the blade has rotated to this set value, which is convenient to operate. Moreover, the other multiple blades also fit and compare with this positioning groove, so that the rotation of multiple blades to this set value can be quickly measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0032] Figure 1 FIG. 1 is a schematic diagram of the overall structure of a propeller blade angle measuring device for wind tunnel tests according to the present invention in the front view direction.

[0033] Figure 2 FIG. 2 is an exploded view of the structure of a propeller blade angle measuring device for wind tunnel tests according to the present invention.

[0034] Figure 3 FIG. 3 is a schematic diagram of the overall structure of a propeller blade angle measuring device for wind tunnel tests according to the present invention in the rear view direction.

[0035] Figure 4 FIG. 4 is a schematic diagram of the overall structure of a propeller blade angle measuring device for wind tunnel tests according to the present invention in the top view direction.

[0036] Among them, 1 - support plate; 2 - scale plate; 10 - horizontal reference plane; 3 - measuring plate; 301 - positioning groove; 302 - measuring mating end face; 300 - positioning pin; 20 - arc-shaped limiting groove; 200 - arc-shaped hole; 30 - positioning through hole; 201 - mounting part; 202 - strip-shaped through hole; 100 - mounting through hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] An embodiment of the present invention discloses a propeller blade angle measuring device for wind tunnel tests, including:

[0041] A support plate 1, one end of the support plate 1 is a reference positioning end that fits with the upper propeller housing of the propeller;

[0042] A scale plate 2, the scale plate 2 is vertically connected to one end of the support plate 1 away from the reference positioning end, and the scale plate 2 has scale lines. At the same time, the side of the support plate 1 opposite to the connection surface of the support plate 1 and the scale plate 2 is a horizontal reference plane 10;

[0043] A measuring plate 3, one end of the measuring plate 3 is rotatably connected to the scale plate 2, and the rotation angle of the measuring plate 3 is calibrated by the scale lines on the scale plate 2. And the measuring plate 3 is locked on the scale plate 2 by a fastener to lock the rotation angle of the measuring plate 3. At the same time, a positioning groove 301 matching the shape of the blade to be measured is provided at the end of the measuring plate 3 away from the scale plate 2, and a measuring mating end face 302 is defined.

[0044] The working principle of this application is as follows:

[0045] S1, Preset blade angle: Place the support plate 1 on the platform, specifically, place the horizontal reference plane 10 on the support plate 1 flat on the platform. With the cooperation of an angle measuring instrument, rotate the measuring plate 3. When the angle between the plane where the measuring mating end face 302 is located and the plane of the platform reaches the set value under the measurement of the angle measuring instrument, stop rotating the measuring plate 3 and lock the measuring plate 3 at this position with a fastener. Then, mark the angle corresponding to the rotation of the measuring plate 3 at this time on the scale line of the scale plate 2.

[0046] S2, Positioning: Specifically, fit the reference positioning end of the support plate 1 of the present application on the upper blade housing of the propeller to determine the measurement reference and position.

[0047] S3, Measurement: Rotate the blade angle of the propeller (how to rotate the blade angle of the propeller is a well-known common means in the art and is irrelevant to the technical problem solved by the present application. Therefore, how to adjust the blade angle of the propeller will not be elaborated here). Until the blade inspection section is in close contact with the positioning groove 301, at this time, the rotation angle of the blade is the same as the preset blade angle, and the rotation angle of each other blade is measured in the same way, then the rotation angles of multiple blades can be quickly detected.

[0048] Among them, if you want to adjust the blade rotation angle to another new set value, loosen the fastener and repeat S1. And in the repeated S1, make the angle between the plane where the measuring mating end face 302 is located and the plane of the platform reach the new set value under the measurement of the angle measuring instrument, and then repeat S2 - S3.

[0049] To further optimize the above technical solution, an arc-shaped positioning groove 301 that cooperates with the upper blade housing is provided at one end of the support plate 1 away from the scale plate 2 to form a reference positioning end.

[0050] Specifically, during positioning, buckle the arc-shaped positioning groove 301 on the outer edge of the upper blade housing of the bolt propeller so as to establish a connection between the present application and the propeller to be measured, thereby providing a measurement reference for the measurement of the present application.

[0051] To further optimize the above technical solution, a positioning pin 300 is connected to the bottom of the arc-shaped positioning groove 301, and a positioning hole is provided on the side wall of the upper blade housing, and the positioning pin 300 is inserted into the positioning hole.

[0052] Specifically, during positioning, in addition to buckling the arc-shaped positioning groove 301 on the outer edge of the upper blade housing of the bolt propeller, insert the positioning pin 300 into the positioning hole, then it is not easy to cause deviation between the present application and the propeller.

[0053] To further optimize the above technical solution, an arc-shaped limiting groove 20 is provided on one side of the scale plate 2, and the open end of the arc-shaped limiting groove 20 extends to the end of the scale plate 2 away from the support plate 1;

[0054] The measuring plate 3 is arched and embedded in the arc-shaped limiting groove 20. The arc-shaped surface of the measuring plate 3 fits against the inner wall of the arc-shaped limiting groove 20 and can rotate within the arc-shaped limiting groove 20. At the same time, the flat end of the measuring plate 3 is the measuring mating end face 302, and a positioning groove 301 is provided.

[0055] To further optimize the above technical solution, an arc-shaped hole 200 penetrates through the bottom of the arc-shaped limiting groove 20. The arc-shaped hole 200 is concentric with the arc-shaped limiting groove 20 and has the same radian. Both ends of the arc-shaped hole 200 are closed ends.

[0056] At the position of the measuring plate 3 corresponding to the arc-shaped hole 200, a plurality of positioning through holes 30 penetrate through. The plurality of positioning through holes 30 are arranged at intervals along the length direction of the arc-shaped hole 200. A fastener is connected in each positioning through hole 30. Each fastener passes through the arc-shaped hole 200 and can move along its length direction within the arc-shaped hole 200 and can be locked on the scale plate 2.

[0057] Specifically: The fastener includes: a fastening bolt and a fastening nut. The tail end of each fastening bolt sequentially passes through the arc-shaped hole 200 and the corresponding positioning through hole 30 and is threadedly connected with a fastening nut. The outer diameter of the fastening nut is larger than the aperture of the corresponding positioning through hole 30 so that each fastening nut can abut against the support plate 1. The head end diameter of each fastening bolt is larger than the width of the arc-shaped hole 200 so that the head end of each fastening bolt is limited on the scale plate 2.

[0058] When it is necessary to adjust the preset blade angle, loosen each fastening nut from the corresponding fastening bolt, and then the angle of the measuring plate 3 can be rotated. When the angle between the plane where the measuring mating end face 302 is located and the plane of the platform reaches the set value under the measurement of the angle measuring instrument, rotate the fastening nut in the reverse direction to lock the measuring plate 3 at this angle.

[0059] To further optimize the above technical solution, it further includes: a plurality of adjusting screws and a plurality of adjusting nuts threadedly connected to the plurality of adjusting screws one by one.

[0060] One end of the scale plate 2 away from the measuring plate 3 is vertically bent to form an installation part 201. One end of the support plate 1 away from the reference positioning end is lapped on the installation part 201. A plurality of strip-shaped through holes 202 penetrate through the installation part 201. The length of each strip-shaped through hole 202 extends along the width direction of the installation part 201. A plurality of installation through holes 100 corresponding to the plurality of strip-shaped through holes 202 penetrate through one end of the support plate 1 away from the reference positioning end.

[0061] The tail ends of multiple adjusting screws respectively pass through multiple mounting through holes 100, and the tail end of each adjusting screw passes through the corresponding strip-shaped through hole 202 and is bolted to the corresponding adjusting nut. At the same time, the head diameter of each adjusting screw is greater than the aperture of the corresponding mounting through hole 100 to be limited on the support plate 1, and the diameter of each adjusting nut is greater than the width of the corresponding strip-shaped through hole 202 to be limited on the mounting portion 201.

[0062] Specifically: During the actual measurement process, when the angle of the blade is rotated to a set value, due to the operation errors existing in the actual operation process, the blade to be measured cannot be completely aligned with the positioning groove 301 in the spanwise direction of the blade. At this time, the adjusting nut can be loosened so that one end of the support plate 1 away from the reference positioning end can reciprocate on the mounting portion 201 along the length direction of the strip-shaped through hole 202, that is, one end of the support plate 1 away from the reference positioning end can reciprocate on the mounting portion 201 along the spanwise direction of the blade, so as to improve the matching degree of the airfoil of the blade with the positioning groove 301 in the spanwise direction.

[0063] To further optimize the above technical solution, it further includes: a gasket, and the gasket is clamped in the overlapping gap between one end of the support plate 1 away from the reference positioning end and the mounting portion 201.

[0064] Specifically: During the actual measurement process, when the angle of the blade is rotated to a set value, due to the operation errors existing in the actual operation process, the blade to be measured cannot be completely aligned with the positioning groove 301 in the axial direction of the blade. Then, the adjusting nut can be loosened first so that multiple gaskets can be inserted into the overlapping gap between one end of the support plate 1 away from the reference positioning end and the mounting portion 201, so as to adjust the distance of the present application relative to the blade in the axial direction of the blade shaft, thereby improving the matching degree of the airfoil of the blade with the positioning groove 301 in the axial direction of the blade shaft.

[0065] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0066] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A propeller blade angle measuring device for wind tunnel tests, characterized in that, it includes: A support plate (1), one end of the support plate (1) is a reference positioning end for mating with the upper propeller housing; A scale plate (2), the scale plate (2) is vertically connected to one end of the support plate (1) away from the reference positioning end, and the scale plate (2) has scale lines. At the same time, the side of the support plate (1) opposite to the connection surface of the support plate (1) and the scale plate (2) is a horizontal reference plane (10); A measuring plate (3), one end of the measuring plate (3) is rotatably connected to the scale plate (2), and the rotation angle of the measuring plate (3) is calibrated by the scale lines on the scale plate (2). And the measuring plate (3) is locked on the scale plate (2) by a fastener to lock the rotation angle of the measuring plate (3). At the same time, a positioning groove (301) matching the shape of the blade to be measured is opened at one end of the measuring plate (3) away from the scale plate (2), and a measuring mating end face (302) is defined.

2. The propeller blade angle measuring device for wind tunnel tests according to claim 1, characterized in that, An arc-shaped positioning groove (301) for mating with the upper propeller housing is opened at one end of the support plate (1) away from the scale plate (2) to form the reference positioning end.

3. The propeller blade angle measuring device for wind tunnel tests according to claim 2, characterized in that, A positioning pin (300) is connected to the bottom of the arc-shaped positioning groove (301), and a positioning hole is opened on the side wall of the upper propeller housing, and the positioning pin (300) is inserted into the positioning hole.

4. The propeller blade angle measuring device for wind tunnel tests according to claim 1, characterized in that, An arc-shaped limiting groove (20) is opened on one side of the scale plate (2), and the open end of the arc-shaped limiting groove (20) extends to one end of the scale plate (2) away from the support plate (1); The measuring plate (3) is arched and is embedded in the arc-shaped limiting groove (20). The arc surface of the measuring plate (3) fits against the inner wall of the arc-shaped limiting groove (20) and can rotate in the arc-shaped limiting groove (20). At the same time, the flat end of the measuring plate (3) is the measuring mating end face (302), and the positioning groove (301) is opened.

5. The propeller blade angle measuring device for wind tunnel tests according to claim 4, characterized in that, An arc-shaped hole (200) penetrates through the bottom of the arc-shaped limiting groove (20), and the arc-shaped hole (200) is concentric with the arc-shaped limiting groove (20) and has the same radian. Both ends of the arc-shaped hole (200) are closed ends; A plurality of positioning through holes (30) penetrate through the measurement plate (3) at positions corresponding to the arc-shaped holes (200), and the plurality of positioning through holes (30) are arranged at intervals along the length direction of the arc-shaped holes (200). Each of the positioning through holes (30) is connected with a fastener. At the same time, each fastener passes through the arc-shaped hole (200) and can move along its length direction in the arc-shaped hole (200), and can be locked on the scale plate (2).

6. A propeller blade angle measuring device for wind tunnel test according to claim 1, characterized in that, further comprising: a plurality of adjusting screws and a plurality of adjusting nuts threadedly connected to the plurality of adjusting screws one by one; One end of the scale plate (2) away from the measurement plate (3) is vertically bent to form a mounting portion (201), and one end of the support plate (1) away from the reference positioning end is lapped on the mounting portion (201). At the same time, a plurality of strip-shaped through holes (202) penetrate through the mounting portion (201), and the length of each strip-shaped through hole (202) extends along the width direction of the mounting portion (201). One end of the support plate (1) away from the reference positioning end is provided with a plurality of mounting through holes (100) that are in one-to-one correspondence and communicate with the plurality of strip-shaped through holes (202); The tail ends of the plurality of adjusting screws pass through the plurality of mounting through holes (100) one by one, and the tail end of each adjusting screw passes through the corresponding strip-shaped through hole (202) and is bolted to the corresponding adjusting nut. At the same time, the head diameter of each adjusting screw is larger than the aperture of the corresponding mounting through hole (100) to be limited on the support plate (1), and the diameter of each adjusting nut is larger than the width of the corresponding strip-shaped through hole (202) to be limited on the mounting portion (201).

7. A propeller blade angle measuring device for wind tunnel test according to claim 6, characterized in that, further comprising: a gasket, and the gasket is clamped in the lapping gap between one end of the support plate (1) away from the reference positioning end and the mounting portion (201).

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