A rapid measurement test bench for the infrared radiation characteristics of an S-bend nozzle

Abstract

A rapid measurement test bench for the infrared radiation characteristics of an S-bend nozzle according to the present invention belongs to the field of experimental test devices; it includes an aeroengine, an S-bend nozzle, an azimuth angle adjustment mechanism, a pitch angle adjustment mechanism, and a base. The base is the supporting component of the entire test bench; the azimuth angle adjustment mechanism is installed on the base and can rotate relative to the base in the horizontal plane; the aeroengine is installed on the azimuth angle adjustment mechanism through an engine mount and rotates in the horizontal plane with the azimuth angle adjustment mechanism to achieve the adjustment of the horizontal azimuth angle; the S-bend nozzle is rotationally connected to the outlet of the aeroengine through the pitch angle adjustment mechanism and is controlled by the pitch angle adjustment mechanism to rotate around the axis. By adjusting the roll angle of the S-bend nozzle, the vertical pitch angle adjustment is equivalently simulated. The present invention solves the problems of the existing test bench for the infrared radiation characteristics of the S-bend nozzle, such as the extension of the test period and the increase of errors caused by frequently adjusting the position of the infrared detector, the installation angle of the S-bend nozzle, and the position of the baffle plate.

Description

Technical Field

[0001] The present invention belongs to the field of experimental test devices, and particularly relates to a rapid measurement test bench for the infrared radiation characteristics of an S-bend nozzle. Background Art

[0002] The exhaust system of an aeroengine is a major infrared radiation source of an aircraft. Conducting infrared stealth design on the exhaust system of an aeroengine can improve the survival ability and combat effectiveness of the aircraft on the battlefield. The S-bend nozzle can effectively shield the high-temperature components of the engine and significantly reduce the infrared radiation characteristics of the exhaust system. Therefore, experimental research on the infrared radiation characteristics of the S-bend nozzle is required. The curved geometric configuration of the S-bend nozzle makes the distribution of its infrared radiation characteristics uneven in the rear hemisphere space. During the experiment, the infrared radiation characteristics of the S-bend nozzle should be measured from different detection angles, and a baffle should be used to shield the environmental radiation outside the target. The national military standard GJB241A-2010 "General Specification for Aero-Turbine Jet and Turbofan Engines" specifies that the infrared radiation characteristics of the exhaust system should include the infrared radiation intensity characteristics measured at horizontal azimuth angles and vertical pitch angles of 0°, 5°, 10°, 15°, 20°, 30°, 40°, 60°, and 90° respectively.

[0003] At present, the technical solution for obtaining the infrared radiation characteristics of the S-bend nozzle at multiple detection angles is to keep the S-bend nozzle and the baffle stationary and move the position of the infrared detection instrument to achieve the adjustment of the detection azimuth. The paper "Influence of Low Emissivity Material Coated Area on Wall Temperature and Infrared Characteristics of Exhaust System" in the 49th Volume, No. 10, 2020 issue of Infrared and Laser Engineering used this technology to measure the infrared radiation characteristics of the S-bend nozzle. However, each time the infrared detection instrument is moved, it is necessary to recheck the instrument position and measurement parameters, resulting in an extended test cycle and increased measurement error. The patent "A New Type of Infrared Radiation Intensity Auxiliary Measurement Device" (Patent No.: CN109489829A) achieved the adjustment of the horizontal azimuth angle of the nozzle by keeping the infrared detection instrument stationary and rotating the detection target. However, this solution still requires manually adjusting the installation angle of the exhaust system and the position of the baffle according to the positioning through holes, and cannot adjust the vertical pitch angle, making it difficult to achieve continuous measurement of the infrared radiation characteristics of the S-bend nozzle in any detection direction and at multiple angles. Summary of the Invention

[0004] Technical Problems to be Solved:

[0005] To avoid the deficiencies of the prior art, the present invention provides a rapid measurement test bench for the infrared radiation characteristics of an S-bend nozzle. The test bench uses a motor to drive the turntable, S-bend nozzle, and baffle to rotate together. The horizontal azimuth angle is adjusted by rotating the turntable, and the vertical pitch angle is equivalently simulated by adjusting the roll angle of the S-bend nozzle. The infrared radiation characteristics of the S-bend nozzle at different detection angles can be continuously measured, so as to solve the problems of extended test cycle and increased error caused by frequently adjusting the position of the infrared detector, the installation angle of the S-bend nozzle, and the position of the baffle in the existing test bench for the infrared radiation characteristics of the S-bend nozzle.

[0006] The technical solution of the present invention is: a rapid measurement test bench for the infrared radiation characteristics of an S-bend nozzle, including an aeroengine, an S-bend nozzle, an azimuth angle adjustment mechanism, a pitch angle adjustment mechanism, and a base. The base is the supporting component of the entire test bench.

[0007] The azimuth angle adjustment mechanism is installed on the base and can rotate relative to the base in the horizontal plane.

[0008] The aeroengine is installed on the azimuth angle adjustment mechanism through an engine mount and rotates in the horizontal plane with the azimuth angle adjustment mechanism to achieve the adjustment of the horizontal azimuth angle.

[0009] The S-bend nozzle is rotationally connected to the outlet of the aeroengine through a pitch angle adjustment mechanism and is controlled by the pitch angle adjustment mechanism to rotate around an axis. The vertical pitch angle is equivalently simulated by adjusting the roll angle of the S-bend nozzle.

[0010] A further technical solution of the present invention is: the azimuth angle adjustment mechanism includes a turntable drive motor, an adapter plate, and a turntable. The adapter plate is fixed on the upper surface of the base. The central axis of the turntable is in rolling connection with the adapter plate, and the turntable is driven to rotate around the axis by the turntable drive motor.

[0011] A further technical solution of the present invention is: it further includes a turntable drive gear; a passive gear is provided on the outer peripheral surface of the turntable and meshes with the turntable drive gear; the output shaft of the turntable drive motor is coaxially and fixedly connected to the turntable drive gear, and the turntable drive motor drives the turntable drive gear to rotate, and at the same time drives the turntable to rotate around the axis.

[0012] A further technical solution of the present invention is: both the adapter plate and the turntable are of a disc structure, and the central axis of the turntable is rotationally connected to the central hole of the adapter plate through a bearing.

[0013] A further technical solution of the present invention is: the pitch angle adjustment mechanism includes an adapter section, a nozzle drive gear, and a nozzle drive motor; the adapter section is a sleeve structure with openings at both ends. Its inlet end is coaxially and fixedly connected to the engine outlet, and its outlet end is in coaxial rolling connection with the inlet end of the S-bend nozzle.

[0014] A toothed disk is sleeved on the outer peripheral surface of the inlet end of the S-bend nozzle and meshes with the nozzle driving gear. The nozzle driving gear and the toothed disk are driven to rotate by a nozzle driving motor, and then the S-bend nozzle is driven to rotate around the axis.

[0015] A further technical solution of the present invention is that the cross-sectional shape and size of the inlet end of the transition section are the same as those of the outlet end of the engine, and the cross-sectional shape and size of the outlet end of the transition section are the same as those of the inlet end of the S-bend nozzle, and both are hermetically connected.

[0016] A further technical solution of the present invention is that it further includes a μ-shaped baffle and a circular baffle; the μ-shaped baffle includes two lateral baffles and a rear baffle fixedly connected in a μ shape, and is installed on the periphery of the aeroengine and the S-bend nozzle and follows the azimuth angle adjustment mechanism; the rear baffle is opposite to the outlet of the S-bend nozzle, and can completely block the radiation of the lateral and rear environments at any angle.

[0017] A further technical solution of the present invention is that the outlet end of the S-bend nozzle is connected to the rear baffle through a circular baffle in a rolling manner.

[0018] A further technical solution of the present invention is that a circular window is opened on the plate surface of the rear baffle, and the circular baffle is coaxially installed in the circular window and is in a rolling connection;

[0019] An installation hole is opened at the center of the circular baffle, and the outlet of the S-bend nozzle is inserted into the installation hole, and the cross-sections of the two are the same; the central axis of the circular window of the rear baffle coincides with the axis of the S-bend nozzle.

[0020] A further technical solution of the present invention is that the two lateral baffles are symmetrically installed on both sides of the rear baffle, and their bottoms are bolted to the turntable.

[0021] A further technical solution of the present invention is that a convex platform is provided at the bottom of the lateral baffle, and a through groove is opened on the convex platform, and a bolt passes through the through groove to vertically fix the lateral baffle to the azimuth angle adjustment mechanism.

[0022] Beneficial effects

[0023] The beneficial effects of the present invention are as follows: For the S-bend nozzle infrared radiation characteristic test bench applying the technical solution of the present invention, the measurement azimuth angle can be continuously adjusted by controlling the rotation of the turntable by a motor, and the continuous adjustment of the pitch angle is equivalently simulated by controlling the change of the roll angle of the S-bend nozzle by a motor, realizing the continuous measurement of the infrared radiation characteristics of the S-bend nozzle at multiple detection angles on the premise of keeping the position of the infrared detection instrument unchanged; in addition, the μ-shaped baffle and the circular baffle rotate together with the turntable and the S-bend nozzle to completely block the radiation of the lateral and rear environments at any angle, and there is no need to make additional adjustments to the baffle during the test process.

[0024] The difficulty of the present invention lies in controlling the azimuth angle of the turntable and the roll angle of the S-bend nozzle to equivalently simulate the continuous adjustment of any detection angle, and achieving complete shielding of environmental radiation by the shielding plate at different detection angles. Description of the Drawings

[0025] Figure 1 FIG. is a schematic structural diagram of a rapid measurement test bench for the infrared radiation characteristics of an S-bend nozzle according to an optional embodiment of the present invention;

[0026] Figure 2 FIG. is a structural diagram of a μ-shaped shielding plate of a rapid measurement test bench for the infrared radiation characteristics of an S-bend nozzle according to an optional embodiment of the present invention;

[0027] Figure 3 FIG. is an enlarged view of a roll angle adjustment structure of a rapid measurement test bench for the infrared radiation characteristics of an S-bend nozzle according to an optional embodiment of the present invention;

[0028] Figure 4 FIG. is a side view of an azimuth angle adjustment structure of a rapid measurement test bench for the infrared radiation characteristics of an S-bend nozzle according to an optional embodiment of the present invention;

[0029] Figure 5 FIG. is a schematic diagram of the state of the azimuth angle of a rapid measurement test bench for the infrared radiation characteristics of an S-bend nozzle being 0° according to an optional embodiment of the present invention;

[0030] Figure 6 FIG. is a schematic diagram of the state of the azimuth angle of a rapid measurement test bench for the infrared radiation characteristics of an S-bend nozzle being 90° according to an optional embodiment of the present invention;

[0031] Figure 7 FIG. is a schematic diagram of the state of the pitch angle of a rapid measurement test bench for the infrared radiation characteristics of an S-bend nozzle being 90° according to an optional embodiment of the present invention;

[0032] Figure 8 FIG. is a schematic diagram of the state of the pitch angle of a rapid measurement test bench for the infrared radiation characteristics of an S-bend nozzle being -90° according to an optional embodiment of the present invention;

[0033] Description of the reference numerals: 1. μ-shaped shielding plate; 2. circular shielding plate; 3. S-bend nozzle; 4. transition section; 5. engine test stand; 6. aero-engine; 7. turntable; 8. nozzle drive gear; 9. nozzle drive motor; 10. adapter plate; 11. turntable drive motor; 12. turntable drive gear; 13. base; 14. lateral shielding plate; 15. rear shielding plate; 16. infrared detection device. Detailed Embodiments

[0034] The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0035] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the 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 to the present invention.

[0036] A rapid measurement test bench for the infrared radiation characteristics of an S-bend nozzle according to the present invention includes an aero-engine, an S-bend nozzle, an azimuth angle adjustment mechanism, a pitch angle adjustment mechanism, and a base. The base is the supporting component of the entire test bench;

[0037] The azimuth angle adjustment mechanism is installed on the base and can rotate relative to the base in the horizontal plane;

[0038] The aero-engine is installed on the azimuth angle adjustment mechanism through an engine mount and rotates in the horizontal plane with the azimuth angle adjustment mechanism to achieve the adjustment of the horizontal azimuth angle;

[0039] The S-bend nozzle is rotationally connected to the outlet of the aero-engine through the pitch angle adjustment mechanism and is controlled by the pitch angle adjustment mechanism to rotate around an axis. By adjusting the roll angle of the S-bend nozzle, the vertical pitch angle adjustment is equivalently simulated.

[0040] Preferably, the azimuth angle adjustment mechanism includes a turntable drive motor, an adapter plate, a turntable drive gear, and a turntable. The adapter plate is fixed on the upper surface of the base, and the central axis of the turntable is in rolling connection with the adapter plate; a passive gear is provided on the outer peripheral surface of the turntable and meshes with the turntable drive gear; the output shaft of the turntable drive motor is coaxially and fixedly connected to the turntable drive gear, and the turntable drive motor drives the turntable drive gear to rotate, and at the same time drives the turntable to rotate around an axis.

[0041] Preferably, the pitch angle adjustment mechanism includes an adapter section, a nozzle drive gear, and a nozzle drive motor; the adapter section is a sleeve structure with openings at both ends. Its inlet end is coaxially and fixedly connected to the engine outlet, and its outlet end is in rolling connection with the inlet end of the S-bend nozzle coaxially; a toothed disc is sleeved on the outer peripheral surface of the inlet end of the S-bend nozzle and meshes with the nozzle drive gear. The nozzle drive motor drives the nozzle drive gear and the toothed disc to rotate, thereby driving the S-bend nozzle to rotate around an axis.

[0042] Example:

[0043] Refer to Figure 1As shown in the figure, an S-bend nozzle infrared radiation characteristic rapid measurement test bench according to an embodiment of the present invention includes: a μ-shaped baffle 1, a circular baffle 2, an S-bend nozzle 3, an adapter section 4, an engine mount 5, an aero-engine 6, a turntable 7, a nozzle drive gear 8, a nozzle drive motor 9, an adapter plate 10, a turntable drive motor 11, a turntable drive gear 12, and a base 13. The μ-shaped baffle 1 is bolted to the turntable 7 and is in rolling connection with the circular baffle 2. The engine mount 5 is fixed to the aero-engine 6 and the adapter section 4 and is fixedly connected to the turntable 7 below. The S-bend nozzle 3 is in rolling connection with the adapter section 4 and cooperates with the circular baffle 2. The turntable 7 is in rolling connection with the central axis of the adapter plate 10, and the relative position of the turntable is defined by a pin on the central axis of the adapter plate 10. The bottom of the adapter plate 10 is fixedly connected to the base 13. The nozzle drive motor 9 is fixed on the engine mount 5. The nozzle drive gear 8 is fixedly connected to the rotating shaft of the nozzle drive motor 9 and meshes with the inlet gear disk of the S-bend nozzle 3. The turntable drive motor 11 is fixed to the adapter plate 10. The turntable drive gear 12 is fixedly connected to the rotating shaft of the turntable drive motor 11 and meshes with the turntable 7 gear.

[0044] For the S-bend nozzle infrared radiation characteristic test bench applying the technical solution of the present invention, the rotation of the turntable 7 can be continuously adjusted by controlling the turntable drive motor 12 to measure the azimuth angle. The rolling angle change of the S-bend nozzle 3 is controlled by the nozzle drive motor 9 to equivalently simulate the continuous adjustment of the pitch angle measurement. The continuous measurement of the infrared radiation characteristics of the S-bend nozzle at multiple detection angles is realized on the premise of keeping the position of the infrared detection device 16 unchanged. In addition, the μ-shaped baffle 1 and the circular baffle 2 rotate together with the turntable 7 and the S-bend nozzle 3 to completely block the environmental radiation at any angle, avoiding additional adjustment of the baffle.

[0045] Specifically, as Figure 1 、 2 shown, the μ-shaped baffle 1 includes two lateral baffles 14 and a rear baffle 15 connected in a μ shape. The rear baffle 15 is provided with a circular window and is in rolling connection with the circular baffle 2. The axis of the circular window coincides with the axis of the S-bend nozzle. The bottom bosses of the two lateral baffles 14 are grooved and bolted to the turntable. The shape and position of the window opened on the circular baffle 2 are the same as the shape and position of the outlet of the S-bend nozzle 3 and cooperate with the outlet wall surface of the S-bend nozzle 3.

[0046] As Figure 1 、 3 shown, the engine mount 5 fixes the aero-engine 6 and the adapter section 4 and is fixed to the turntable 7 below. The S-bend nozzle 3 is in rolling connection with the adapter section 4. The axis of the S-bend nozzle 3 coincides with the axes of the adapter section 4 and the aero-engine 6. The inlet gear of the S-bend nozzle 3 meshes with the nozzle drive gear 8 and drives the circular baffle 2 to rotate around the axis of the S-bend nozzle 3 under the drive of the nozzle drive motor 9.

[0047] As Figure 1 、4 As shown, the turntable 7 is in rolling connection with the middle axis of the adapter plate 10. The middle axis of the adapter plate 10 fixes the relative position of the turntable 7 on the middle axis with a pin. The turntable driving motor 11 is fixedly connected to the adapter plate 10. The gear of the turntable 7 meshes with the turntable driving gear 12. Driven by the turntable driving motor 11, the μ-shaped baffle 1 and the engine test stand 5 are driven to rotate together around the central axis of the turntable 7.

[0048] As Figure 1 、 2 As shown in FIGS. 5, when the measured azimuth angle is 0°, the center line of the field of view of the infrared detection device 16 coincides with the axis of the S-bend nozzle 3. At this time, the rear baffle 15 completely blocks the environmental radiation.

[0049] As Figure 1 、 2 As shown in FIGS. 5 and 6, when the measured azimuth angle is 90°, the turntable 7 is driven by the turntable driving motor 11 to rotate clockwise by 90°, so that the axis of the S-bend nozzle 3 is perpendicular to the center line of the field of view of the infrared detection device 16. At this time, the side baffle 14 completely blocks the environmental radiation.

[0050] As Figure 1 、 2 As shown in FIGS. 5 and 7, when the measured pitch angle is 90°, the turntable 7 is driven by the turntable driving motor 11 to rotate clockwise by 90°, and at the same time the nozzle driving motor 9 drives the S-bend nozzle 3 to rotate counterclockwise by 90°, so that the actual pitch angle is equivalently deflected to 90°. At this time, the side baffle 14 completely blocks the environmental radiation.

[0051] As Figure 1 、 2 As shown in FIGS. 5 and 8, when the measured pitch angle is -90°, the turntable 7 is driven by the turntable driving motor 11 to rotate clockwise by 90°, and at the same time the nozzle driving motor 9 drives the S-bend nozzle 3 to rotate clockwise by 90°, so that the actual pitch angle is equivalently rotated to -90°. At this time, the side baffle 14 completely blocks the environmental radiation.

[0052] As Figure 5 、 6 As shown in FIGS. 7 and 8, the angles and quantities of the measured azimuth angle and pitch angle are determined by the infrared test requirements of the S-bend nozzle, and can be any angles and multiple angles with continuous changes. In this patent, the azimuth angle of 0°, the azimuth angle of 90°, the pitch angle of 90° and the pitch angle of -90° are taken as examples.

[0053] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and purposes of the present invention.

Claims

1. A rapid measurement test bench for the infrared radiation characteristics of an S-bend nozzle, characterized in that: It includes an aeroengine, an S-shaped nozzle, an azimuth angle adjustment mechanism, a pitch angle adjustment mechanism and a base. The base is the supporting component of the entire test bench. It also includes a turntable drive gear. A passive gear is provided on the outer peripheral surface of the turntable and meshes with the turntable drive gear. The output shaft of the turntable drive motor is coaxially and fixedly connected to the turntable drive gear. The turntable drive motor drives the turntable drive gear to rotate, and at the same time drives the turntable to rotate around the axis. The azimuth angle adjustment mechanism is installed on the base and can rotate in the horizontal plane relative to the base. The azimuth angle adjustment mechanism includes a turntable drive motor, an adapter plate and a turntable. The adapter plate is fixed on the upper surface of the base. The central axis of the turntable is in rolling connection with the adapter plate. The turntable is driven to rotate around the axis by the turntable drive motor. The aeroengine is installed on the azimuth angle adjustment mechanism through an engine mount and rotates in the horizontal plane with the azimuth angle adjustment mechanism to achieve the adjustment of the horizontal azimuth angle. The S-shaped nozzle is rotationally connected to the aeroengine outlet through the pitch angle adjustment mechanism and is controlled by the pitch angle adjustment mechanism to rotate around the axis. By adjusting the roll angle of the S-shaped nozzle, the vertical pitch angle adjustment is equivalently simulated. The pitch angle adjustment mechanism includes an adapter section, a nozzle drive gear and a nozzle drive motor. The adapter section is a sleeve structure with openings at both ends. Its inlet end is coaxially and fixedly connected to the engine outlet, and its outlet end is in coaxial rolling connection with the inlet end of the S-shaped nozzle. A toothed disc is sleeved on the outer peripheral surface of the inlet end of the S-shaped nozzle and meshes with the nozzle drive gear. The nozzle drive motor drives the nozzle drive gear and the toothed disc to rotate, and then drives the S-shaped nozzle to rotate around the axis. It also includes a μ-shaped baffle and a circular baffle. The μ-shaped baffle includes two side baffles and a rear baffle fixedly connected in a μ shape. It is installed on the periphery of the aeroengine and the S-shaped nozzle and follows the azimuth angle adjustment mechanism. The rear baffle is opposite to the outlet of the S-shaped nozzle and can completely block the lateral and rearward environmental radiation at any angle.

2. The rapid measurement test bench for the infrared radiation characteristics of an S-bend nozzle according to claim 1, characterized in that: Both the adapter plate and the turntable are disc structures. The central axis of the turntable is rotationally connected to the central hole of the adapter plate through a bearing.

3. The rapid measurement test bench for the infrared radiation characteristics of an S-bend nozzle according to claim 1, characterized in that: The cross-sectional shape and size of the inlet end of the adapter section are the same as those of the engine outlet end, and the cross-sectional shape and size of the outlet end of the adapter section are the same as those of the inlet end of the S-shaped nozzle, and both are in sealed connection.

4. The rapid measurement test bench for the infrared radiation characteristics of an S-bend nozzle according to claim 1, characterized in that: The outlet end of the S-shaped nozzle is in rolling connection with the rear baffle through the circular baffle.

5. The rapid measurement test bench for the infrared radiation characteristics of an S-bend nozzle according to claim 4, characterized in that: A circular window is opened on the plate surface of the rear baffle. The circular baffle is coaxially installed in the circular window and is in rolling connection. An installation hole is opened at the center of the circular baffle. The outlet of the S-shaped nozzle is inserted into the installation hole, and their cross-sections are the same. The central axis of the circular window of the rear baffle coincides with the axis of the S-shaped nozzle.

6. The rapid measurement test bench for the infrared radiation characteristics of an S-bend nozzle according to claim 4 or 5, characterized in that: The two side baffles are symmetrically installed on both sides of the rear baffle, and their bottoms are bolted to the turntable.

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