Method and device for measuring sideslip angle of wind tunnel test model

Abstract

The invention belongs to the technical field of wind tunnel tests, and discloses a method and a device for measuring a sideslip angle of a wind tunnel test model. The device comprises a sideslip measuring tool, a reference plate and a measuring platform. The datum plate is a long-strip-shaped flat plate and is fixed to an outlet of the spray pipe. The measuring platform is a hexahedron with a reference plane and is sleeved and fixed on the wind tunnel model; the sideslip measurement tool is fixed on the side surface of the measurement platform, the laser range finder is fixed on the sideslip measurement tool, and the laser emission direction faces the reference plate. The method comprises the steps of installing a wind tunnel model and adjusting an attack angle and a roll angle of the wind tunnel model; installing a measuring platform; installing a sideslip measuring tool; installing a laser range finder; emitting horizontal light; oblique light rays are emitted; calculating a sideslip angle of the wind tunnel model; and calculating a seven-time average sideslip angle of the wind tunnel model. According to the device and the method, the sideslip angle of the model is measured in a wind tunnel test model preparation stage, the accuracy of a test result is improved, and data support is provided for aircraft development.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind tunnel tests, and particularly relates to a method and device for measuring the sideslip angle of a wind tunnel test model. Background Art

[0002] Wind tunnel tests are one of the important means to obtain the aerodynamic characteristics of aircraft and support the development of the aerospace field. When conducting wind tunnel tests, the measurement of the model angle is extremely important and determines the quality of the test results. The sideslip angle is a key parameter describing the lateral offset angle of the model relative to the oncoming flow direction, and its accurate measurement is of great significance for studying the lateral aerodynamic characteristics, flight stability, and control of aircraft. However, in the model preparation stage before wind tunnel tests, unlike the angle of attack and roll angle that can be directly measured using an angle gauge, there is a problem that the sideslip angle cannot be effectively measured. The accuracy of the sideslip angle depends on the precision of model processing, installation, and the angle of attack mechanism itself. During this process, the test model installers cannot confirm the sideslip angle to ensure the accuracy of installation. In particular, in multi-body separation tests, multiple separated bodies are respectively installed on different mechanisms or devices, and some devices are even added temporarily and do not have the ability to change the sideslip angle. How to confirm whether the sideslip angles between multiple mechanisms or devices match poses a practical requirement for the sideslip measurement method and device.

[0003] Currently, there is an urgent need to develop a method and device for measuring the sideslip angle of a wind tunnel test model. Summary of the Invention

[0004] One technical problem to be solved by the present invention is to provide a device for measuring the sideslip angle of a wind tunnel test model, and another technical problem to be solved is to provide a method for measuring the sideslip angle of a wind tunnel test model.

[0005] The device for measuring the sideslip angle of a wind tunnel test model of the present invention includes a sideslip measurement tooling, a reference plate, and a measurement platform; The reference plate is a long strip-shaped flat plate fixed at the outlet of the nozzle; the measurement platform is a hexahedron with a reference plane, sleeved and fixed on the wind tunnel model; the sideslip measurement tooling is fixed on the side of the measurement platform, and a laser rangefinder is fixed on the sideslip measurement tooling, and the laser emission direction of the laser rangefinder faces the reference plate.

[0006] Further, the sideslip measurement tooling is a Π-shaped frame; the horizontal plate of the Π-shaped frame is the tooling base, the tooling base is fixed on the side of the measurement platform, and the central axis of the tooling base is parallel to the central axis of the wind tunnel model; the two vertical plates of the Π-shaped frame include a long vertical plate and a short vertical plate; the long vertical plate is a shielding end plate, the shielding end plate is close to the reference plate, and a horizontal hole is arranged along the length direction on the shielding end plate F 1 and an inclined shooting holeF 2 ; The short vertical plate is the emission end plate. The emission end plate is away from the reference plate, and a laser emission hole is provided on the emission end plate. O ; The laser rangefinder is fixed on the outer side of the emission end plate. The horizontal light ray emitted by the laser rangefinder sequentially passes through the laser emission hole O , the horizontal hole F 1 and is incident on the horizontal point on the reference plate. The oblique light ray emitted by the laser rangefinder sequentially passes through the laser emission hole O , the oblique hole F 2 and is incident on the oblique point on the reference plate.

[0007] The method for measuring the sideslip angle of a wind tunnel test model of the present invention includes the following steps: S10. Install the wind tunnel model and adjust the angle of attack and roll angle of the wind tunnel model; Install the wind tunnel model on the support device of the wind tunnel, and then level the wind tunnel model through an angle measuring instrument to ensure that the angle of attack and roll angle of the wind tunnel model are at the theoretical zero degree; S20. Install the measurement platform; Set and fix the measurement platform on the wind tunnel model to ensure that each measurement reference surface of the measurement platform coincides with the model coordinate system; S30. Install the sideslip measurement tooling; Fix the tooling base of the sideslip measurement tooling on the side of the measurement platform, and the central axis of the tooling base is parallel to the central axis of the wind tunnel model; S40. Install the laser rangefinder; Fix the laser rangefinder on the outer side of the emission end plate by means such as holding it by hand, and align the laser head of the laser rangefinder with the laser emission hole on the sideslip measurement tooling O ; S50. Emit a horizontal light ray; The laser rangefinder emits a horizontal light ray, and the horizontal light ray sequentially passes through the laser emission hole O , the horizontal hole F 1 and is incident on the horizontal point on the reference plate. The distance between the laser emission hole O and the horizontal point is ; The vertical distance between the laser emission hole O and the reference plate is D ; S60. Emit an oblique light ray; The laser rangefinder emits an oblique light ray, and the oblique light ray sequentially passes through the laser emission hole O , the oblique hole F 2 and is incident on the oblique point on the reference plate. The laser emission holeO The distance to the oblique incidence point is ; S70. Calculate the sideslip angle of the wind tunnel model β ; The included angle between the horizontal light ray and the oblique incidence light ray is A , and the sideslip angle β The calculation formula is as follows: ; S80. Calculate the seven - time average sideslip angle of the wind tunnel model; Continuously adjust the position of the wind tunnel model in the wind tunnel and conduct seven measurements, and then calculate the seven - time average sideslip angle of the wind tunnel model by the method of taking the average value, and use the seven - time average sideslip angle as the sideslip angle of the wind tunnel model.

[0008] Furthermore, the included angle A between the horizontal light ray and the oblique incidence light ray is 45°.

[0009] The method and device for measuring the sideslip angle of a wind tunnel test model of the present invention utilize the spatial geometric transformation relationship to transform the measurement of the sideslip angle of the test model into the measurement of distance. First, measure the lengths of the horizontal light ray and the oblique incidence light ray through a laser rangefinder, and then obtain the sideslip angle through the spatial geometric transformation relationship between the lengths of the horizontal light ray and the oblique incidence light ray and the sideslip angle.

[0010] The method and device for measuring the sideslip angle of a wind tunnel test model of the present invention realize the measurement of the sideslip angle of the model in the preparation stage of the wind tunnel test, improve the accuracy of the test results, and provide good data support for the lateral aerodynamic characteristics, flight stability, and control of the aircraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic structural diagram of the device for measuring the sideslip angle of a wind tunnel test model of the present invention; Figure 2 is a schematic structural diagram of the sideslip angle measurement tooling in the device for measuring the sideslip angle of a wind tunnel test model of the present invention; Figure 3 is the schematic principle diagram of the method for measuring the sideslip angle of a wind tunnel test model of the present invention.

[0012] In the figure, 1. Sideslip measurement tooling; 2. Laser rangefinder; 3. Reference plate; 4. Nozzle; 5. Measurement platform; 6. Wind tunnel model; 101. Tooling base; 102. Emission end plate; 103. Shielding end plate; 104. Laser emission hole O ; 105. Horizontal hole F 1 ; 106. Oblique incidence hole F 2; 107. Horizontal light ray; 108. Oblique incident light ray; Figure 3 in O represents the laser emission hole O . Specific implementation mode

[0013] The following specific examples are used to illustrate the implementation modes of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0014] Example: As Figure 1 shown, the device for measuring the sideslip angle of a wind tunnel test model in this embodiment includes a sideslip measurement tooling 1, a reference plate 3, and a measurement platform 5; The reference plate 3 is a long strip-shaped flat plate, fixed at the outlet of the nozzle 4; the measurement platform 5 is a hexahedron with a reference plane, sleeved and fixed on the wind tunnel model 6; the sideslip measurement tooling 1 is fixed on the side of the measurement platform 5, and the laser rangefinder 2 is fixed on the sideslip measurement tooling 1, and the laser emission direction of the laser rangefinder 2 faces the reference plate 3.

[0015] Furthermore, as Figure 2 shown, the sideslip measurement tooling 1 is a Π-shaped frame; the horizontal plate of the Π-shaped frame is the tooling base 101, the tooling base 101 is fixed on the side of the measurement platform 5, and the central axis of the tooling base 101 is parallel to the central axis of the wind tunnel model 6; the two vertical plates of the Π-shaped frame include a long vertical plate and a short vertical plate; the long vertical plate is the shielding end plate 103, the shielding end plate 103 is close to the reference plate 3, and a horizontal hole F 1 105 and an oblique incident hole F 2 106 are provided on the shielding end plate 103 along the length direction; the short vertical plate is the emission end plate 102, the emission end plate 102 is far from the reference plate 3, and a laser emission hole O 104 is provided on the emission end plate 102; The laser rangefinder 2 is fixed on the outside of the emission end plate 102, and the horizontal light ray 107 emitted by the laser rangefinder 2 sequentially passes through the laser emission hole O 104 and the horizontal hole F 1 105 and is incident on the horizontal point on the reference plate 3, and the oblique incident light ray 108 emitted by the laser rangefinder 2 sequentially passes through the laser emission hole O 104 and the oblique incident hole F 2 106 and is incident on the oblique incident point on the reference plate 3.

[0016] The method for measuring the sideslip angle of a wind tunnel test model in this embodiment includes the following steps: S10. Install the wind tunnel model 6 and adjust the angle of attack and roll angle of the wind tunnel model 6; Install the wind tunnel model 6 on the support device of the wind tunnel, and then level the wind tunnel model 6 through an angle measuring instrument to ensure that the angle of attack and roll angle of the wind tunnel model 6 are theoretically zero degrees; S20. Install the measurement platform 5; Set and fix the measurement platform 5 on the wind tunnel model 6 to ensure that each measurement reference plane of the measurement platform 5 coincides with the model coordinate system; S30. Install the sideslip measurement tooling 1; Fix the tooling base 101 of the sideslip measurement tooling 1 on the side of the measurement platform 5, and the central axis of the tooling base 101 is parallel to the central axis of the wind tunnel model 6; S40. Install the laser rangefinder 2; Fix the laser rangefinder 2 outside the transmitting end plate 102 by hand or other means, and align the laser head of the laser rangefinder 2 with the laser emitting hole O 104 on the sideslip measurement tooling 1; S50. Emit the horizontal light ray 107; As Figure 3 shown, the laser rangefinder 2 emits the horizontal light ray 107, and the horizontal light ray 107 sequentially passes through the laser emitting hole O 104, the horizontal hole F 1 105 and is incident on the horizontal point on the reference plate 3. The distance between the laser emitting hole O 104 and the horizontal point is ; The vertical distance between the laser emitting hole O 104 and the reference plate 3 is D ; S60. Emit the oblique light ray 108; The laser rangefinder 2 emits the oblique light ray 108, and the oblique light ray 108 sequentially passes through the laser emitting hole O 104, the oblique hole F 2 106 and is incident on the oblique point on the reference plate 3. The distance between the laser emitting hole O 104 and the oblique point is ; S70. Calculate the sideslip angle of the wind tunnel model 6 β ; The included angle between the horizontal light ray 107 and the oblique light ray 108 is A , and the calculation formula for the sideslip angle β is as follows: ; S80. Calculate the seven - time average sideslip angle of the wind tunnel model 6; Continuously adjust the position of the wind tunnel model 6 in the wind tunnel and conduct seven measurements, and then calculate the seven - time average sideslip angle of the wind tunnel model 6 by the method of taking the average value. Take the seven - time average sideslip angle as the sideslip angle of the wind tunnel model 6.

[0017] Furthermore, the included angle A between the horizontal light ray 107 and the oblique light ray 108

[0018] The above - mentioned embodiments merely illustrate the principles and effects of the present invention, rather than limiting the present invention. Any person familiar with this technology can modify or change the above - mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A device for measuring the sideslip angle of a wind tunnel test model, characterized in that: The device comprises a side-slip measurement tool (1), a reference plate (3) and a measurement platform (5); The reference plate (3) is a long flat plate fixed to the outlet of the nozzle (4); the measuring platform (5) is a hexahedron having a reference plane, mounted on and fixed to the wind tunnel model (6); the side-slip measuring fixture (1) is fixed to the side of the measuring platform (5), the laser rangefinder (2) is fixed to the side-slip measuring fixture (1), and the laser emission direction of the laser rangefinder (2) is toward the reference plate (3).

2. The device for measuring the sideslip angle of a wind tunnel test model according to claim 1, characterized in that: The side-slip measurement tool (1) is a Π-shaped frame; the horizontal plate of the Π-shaped frame is a tool base (101), the tool base (101) is fixed to the side of the measurement platform (5), and the central axis of the tool base (101) is parallel to the central axis of the wind tunnel model (6); the two vertical plates of the Π-shaped frame include a long vertical plate and a short vertical plate; the long vertical plate is a shielding end plate (103), the shielding end plate (103) is close to the reference plate (3), and the shielding end plate (103) is provided with a horizontal hole along the length direction. F 1 (105) and oblique perforations F 2 (106); the short vertical plate is a transmitting end plate (102), the transmitting end plate (102) is far away from the reference plate (3), and a laser transmitting hole is provided on the transmitting end plate (102) O (104); The laser rangefinder (2) is fixed on the outside of the transmitting end plate (102), and the horizontal light (107) emitted by the laser rangefinder (2) passes through the laser emitting holes in sequence. O (104), horizontal hole F 1 (105) is incident on the horizontal point on the reference plate (3), and the oblique light (108) emitted by the laser rangefinder (2) passes through the laser emission holes in sequence. O (104) Oblique perforation F 2 (106) is incident on the oblique point on the reference plate (3).

3. A method for measuring the sideslip angle of a wind tunnel test model, which is used in the device for measuring the sideslip angle of a wind tunnel test model as claimed in claim 2, characterized in that: The method comprises the following steps: S10. Installing the wind tunnel model (6), and adjusting the angle of attack and the roll angle of the wind tunnel model (6); The wind tunnel model (6) is mounted on a supporting device of the wind tunnel, and the wind tunnel model (6) is leveled by an angle measuring instrument to ensure that the angle of attack and the rolling angle of the wind tunnel model (6) are theoretically zero degrees; S20. Install the measuring platform (5); Mounting and fixing the measuring platform (5) on the wind tunnel model (6) to ensure that each measuring reference surface of the measuring platform (5) coincides with the model coordinate system; S30. Install the side slip measurement tool (1); Fixing a tool base (101) of the side-slip measurement tool (1) on a side of the measurement platform (5), wherein the central axis of the tool base (101) is parallel to the central axis of the wind tunnel model (6); S40. Install the laser rangefinder (2); The laser rangefinder (2) is fixed to the outside of the transmitting end plate (102) by hand-holding or the like, and the laser head of the laser rangefinder (2) is aligned with the laser transmitting hole on the side-slip measuring tool (1). O (104); S50. emit horizontal light (107); The laser rangefinder (2) emits a horizontal light beam (107), which passes through the laser emission holes in sequence. O (104), horizontal hole F 1 (105) is incident on the horizontal point on the reference plate (3), the laser emission hole O The distance between (104) and the horizontal point is ; Laser emission hole O The vertical distance between (104) and the reference plate (3) is D ; S60. emit oblique light (108); The laser rangefinder (2) emits oblique light (108), and the oblique light (108) passes through the laser emission holes in sequence. O (104) Oblique perforation F 2 (106) incident on the oblique point on the reference plate (3), the laser emission hole O The distance between (104) and the oblique point is ; S70. Calculation of the sideslip angle of the wind tunnel model (6) β ; The angle between the horizontal light (107) and the oblique light (108) is A , sideslip angle β The calculation formula is as follows: ； S80. Calculate seven average sideslip angles of the wind tunnel model (6); The position of the wind tunnel model (6) in the wind tunnel is continuously adjusted and seven measurements are performed. Then, the seven average sideslip angles of the wind tunnel model (6) are calculated by an average value method, and the seven average sideslip angles are taken as the sideslip angles of the wind tunnel model (6).

4. The method for measuring the sideslip angle of a wind tunnel test model according to claim 3, characterized in that: The angle between the horizontal light (107) and the oblique light (108) is A is 45°.

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