A fan nacelle simulation device for wind tunnel noise tests of wing / fan installation effects

Abstract

The present invention discloses a fan nacelle simulation device for wind tunnel noise tests of wing / fan installation effects, which includes a fan model, a fan model support mechanism, a high-speed drive motor, and a nacelle angle-of-attack mechanism. The nacelle angle-of-attack mechanism is fixedly installed on a hydraulic tail support. The fan model is a scaled-down model of a real aeroengine fan. Multiple sets of measurement rakes are fixedly installed on the inner wall of the fan model, and total pressure manometer tubes, static pressure manometer tubes, or total temperature sensors are installed on the measurement rakes to measure the parameters of total pressure, total temperature, and static pressure required for the test. The fan model is connected to the fan model support mechanism through a flange. The output shaft of the high-speed drive motor drives the blades of the fan model to rotate. The nacelle angle-of-attack mechanism is rotatably connected to the rear end of the high-speed drive motor, and the nacelle angle-of-attack mechanism can change the windward angle of the fan model. The present invention can truly simulate the noise generated by the external duct airflow of the fan nacelle.

Description

Technical Field

[0001] The invention belongs to the field of wind tunnel engine noise test, and in particular relates to a fan nacelle simulation device for wind tunnel noise test of wing / fan installation effect. Background Art

[0002] The wing / fan installation effect test is a test to test the size of the external noise value under different interference effects caused by different positional relationships (distances or angles) between the aircraft wing and the aircraft engine after the aircraft engine is disturbed by the aircraft wing, and obtain the noise increment caused by the interference. The fan nacelle simulator is used to simulate the working state of the aircraft engine. The wing model is installed on a multi-degree-of-freedom support platform, which can realize 2 degrees of freedom in the horizontal direction and the angle of attack of the wing model. The fan nacelle simulator is installed on the hydraulic tail support, and the height change of the fan nacelle simulator is realized by the hydraulic tail support, and the angle of attack change is realized by the fan nacelle angle of attack mechanism of the fan nacelle simulator itself. The existing fan nacelle simulator has a small fan model size, and the high-speed motor that usually matches it is large in size and cannot be installed inside the fan model. Therefore, a fan nacelle simulator is needed. Summary of the invention

[0003] In view of the above shortcomings, the present invention provides a fan nacelle simulation device for wind tunnel noise testing of wing / fan installation effects, which can simulate the working state of a scaled-down fan model of an aircraft engine, and can meet the noise testing and experimental simulation requirements of approach, flyover, cruise and other working conditions of real aircraft, especially civil passenger aircraft, in wind tunnel noise testing of wing / fan installation effects.

[0004] The technical scheme adopted by the present invention is: a fan nacelle simulation device for a wind tunnel noise test of a wing / fan installation effect, comprising a fan model, a fan model support mechanism, a high-speed drive motor and a nacelle angle of attack mechanism, wherein the nacelle angle of attack mechanism is fixedly mounted on a hydraulic tail support, the fan model is a scaled model of a real aircraft engine fan, a plurality of groups of measuring rakes are fixedly mounted on the inner wall of the fan model, a total pressure pressure measuring tube, a static pressure pressure measuring tube or a total temperature sensor is mounted on the measuring rake, and the measurement of the total pressure, total temperature and static pressure parameters required for the test is achieved, the fan model is connected to the fan model support mechanism through a flange, the output shaft of the high-speed drive motor drives the blades of the fan model to rotate, and the speed, flow rate and pressure ratio required by the test working condition are achieved, the nacelle angle of attack mechanism is rotatably connected to the rear end of the high-speed drive motor, and the nacelle angle of attack mechanism can change the windward angle of the fan model.

[0005] Further, the fan model support mechanism includes a bushing and a transmission long shaft. The fan model includes a blade cap, a sound lining, a measurement rake, fan blades, a hub, an outlet guide vane, and a fan nacelle. The blade cap is installed at the front end of the fan blades, and the fan blades are installed on the hub. The blade cap, fan blades, and hub are located inside the fan nacelle. The sound lining is installed on the inner wall of the air inlet of the fan nacelle. The front end of the transmission long shaft is fixedly connected to the hub. The bushing is sleeved on the transmission long shaft through multiple groups of bearings. The outlet guide vane is installed at the front end of the bushing, and the front end of the bushing is also fixedly connected to the inner wall of the fan nacelle. Three groups of measurement rakes are respectively installed on the inner wall of the air inlet of the fan nacelle, located in front of the fan blades, between the fan blades and the outlet guide vane, and behind the outlet guide vane. The rear end of the transmission long shaft is connected to the output shaft of the driving motor, and the rear end of the bushing is fixedly connected to the housing of the driving motor.

[0006] Further, the nacelle angle of attack mechanism includes a mounting rotating shaft, a connecting rod assembly, a spherical plain bearing, an electric push rod assembly, and an angle of attack mechanism housing. The electric push rod assembly is installed on the angle of attack mechanism housing. The movement direction of the electric push rod assembly is parallel to the axis of the angle of attack mechanism housing. The electric push rod assembly is hinged to one end of the connecting rod assembly through a spherical plain bearing. The other end of the connecting rod assembly is connected to the upper end of the rear cover of the high-speed driving motor. The front end of the angle of attack mechanism housing is hinged to the center of the plane of the rear cover of the high-speed driving motor through a mounting rotating shaft.

[0007] Further, the measurement rake is a cross-shaped rake.

[0008] The advantages and beneficial effects of the present invention are as follows: The fan nacelle model device of the present invention can cover the noise test working condition ranges of various aero-engines, has the advantages of simple test simulation equipment and easy control of working condition changes, and can truly simulate the noise generated by the external duct airflow of the fan nacelle. Description of the Drawings

[0009] Figure 1 is the structural external view of the present invention

[0010] Figure 2 is the structural axial sectional view of the present invention;

[0011] Figure 3 is the measuring point layout diagram on the measurement rake located in front of the fan blades;

[0012] Figure 4 is the measuring point layout diagram on the measurement rake located between the fan blades and the outlet guide vane;

[0013] Figure 5 is the measuring point layout diagram on the measurement rake located behind the outlet guide vane; Detailed Embodiments

[0014] The following further illustrates the present invention by way of examples according to the accompanying drawings of the specification:

[0015] Example 1

[0016] As Figure 1 shown, a fan nacelle simulation device for wind tunnel noise test of wing / fan installation effect is mainly applied to simulate the working conditions of an aero-engine in the wing / fan installation effect test in a wind tunnel noise test. The wing / fan installation effect test is an experiment to measure the magnitude of the external noise value under different interference effects generated by the different position relationships (distance or angle) between the aircraft wing and the aero-engine after the aero-engine is interfered by the aircraft wing. The device includes a fan model 1-1, a fan model support mechanism 1-2, a high-speed drive motor 1-3, and a nacelle angle-of-attack mechanism 1-4. The nacelle angle-of-attack mechanism 1-4 is fixedly installed on a hydraulic tail support. The fan model 1-1 is a scaled-down model of a real aero-engine fan. A plurality of measurement rakes 3 are fixedly installed on the inner wall of the fan model 1-1. A total pressure manometer tube 3-1, a static pressure manometer tube 3-2, or a total temperature sensor 3-3 is installed on the measurement rake to measure the parameters of total pressure, total temperature, and static pressure required for the test. The fan model 1-1 is connected to the fan model support mechanism 1-2 through a flange. The output shaft of the high-speed drive motor 1-3 drives the blades of the fan model 1-1 to rotate to reach the rotational speed, flow rate, and pressure ratio required for the test measurement conditions. The nacelle angle-of-attack mechanism 1-4 is rotatably connected to the rear end of the high-speed drive motor 1-3, and the nacelle angle-of-attack mechanism 1-4 can change the windward angle of the fan model 1-1. The fan model 1-1 can be replaced with models of different scaled-down sizes of different types of engines. The rotation direction of the fan model 1-1 is clockwise in the direction of flight.

[0017] As Figure 2As shown, the fan model support mechanism includes a shaft sleeve 9 and a transmission long shaft 8, and the fan model includes a propeller cap 1, an acoustic liner 2, a measuring rake 3, a fan blade 4, a hub 5, an outlet guide vane 6, and a fan nacelle 7. The propeller cap 1 is installed at the front end of the fan blade 4, and plays a role in smoothing the air flow of the intake. The fan blade 4 is installed on the hub 5. The rotation of the fan blade 4 has a role in pressurizing and accelerating the air flow. The propeller cap 1, the fan blade 4 and the hub 5 are located inside the fan nacelle 7. The acoustic liner 2 is installed on the inner wall of the air inlet of the fan nacelle 7, and plays a role in suppressing noise. The transmission long shaft The front end of the fan model 1-1 is fixedly connected to the hub 5, and the sleeve 9 is sleeved on the transmission shaft 8 through three groups of bearings 10. The sleeve 9 mainly plays the role of cantilever support for the fan model 1-1. The outlet guide vane 6 is installed at the front end of the sleeve 9. The front end of the sleeve 9 is also fixedly connected to the inner wall of the fan nacelle 7. Three groups of measuring rakes 3 are respectively installed on the inner wall of the air inlet of the fan nacelle 7, which are respectively located in front of the fan blade 4, between the fan blade 4 and the outlet guide vane 6, and behind the outlet guide vane 6. The rear end of the transmission shaft 8 is connected to the output shaft of the drive motor, and the rear end of the sleeve 9 is fixedly connected to the housing of the drive motor. According to different test objects, the number and shape of the fan blades 4 can be replaced. The sleeve 9 can adapt to different interfaces of the fan model 1-1, so as to replace fan models 1-1 of different sizes and models. The high-speed drive motor 1-3 is mainly composed of a motor body 11 and a motor back cover 12. Under the control of the corresponding frequency converter, the motor body 11 can output the speed and torque required for the test. The motor rear cover 12 is used to connect the nacelle angle of attack mechanism 1-4 and the motor body 11, playing a role of transition and support.

[0018] like Figure 2 As shown, the nacelle angle of attack mechanism 1-4 includes a mounting shaft 13, a connecting rod assembly 14, a spherical bearing 15, an electric push rod assembly 16 and an angle of attack mechanism housing 17. The electric push rod assembly 16 is mounted on the angle of attack mechanism housing 17. The movement direction of the electric push rod assembly 16 is parallel to the axis of the angle of attack mechanism housing 17. The electric push rod assembly 16 is hinged to one end of the connecting rod assembly 14 through the spherical bearing 15. The other end of the connecting rod assembly 14 is connected to the upper end of the rear cover of the high-speed drive motor 1-3. The front end of the angle of attack mechanism housing 17 is hinged to the center of the rear cover plane of the high-speed drive motor 1-3 through the mounting shaft 13. The electric push rod assembly 16 is the power source of the nacelle angle of attack mechanism 1-4. The electric push rod assembly 16 outputs force and linear displacement under the control of its controller, which is transmitted to the motor rear cover 12 through the spherical bearing 15, the connecting rod assembly 14 and the mounting shaft 13, thereby realizing the change of the windward angle of the fan model 1-1. The rear end of the nacelle angle of attack mechanism 1-4 is installed on the hydraulic tail support ɑ head. The angle of attack variation range is: -15°~+15°, and the position control accuracy is controlled within 5′.

[0019] like Figures 3 - 5As shown in the figure, the measuring rake is a cross-shaped rake. There are 10 total pressure measuring tubes 3-1, 6 total temperature sensors 3-3 and 4 static pressure measuring tubes 3-2 arranged on the measuring rake in front of the fan blade. There are 10 total pressure measuring tubes 3-1 and 4 static pressure measuring tubes 3-2 arranged on the measuring rake between the fan blade and the outlet guide vane. There are 10 total pressure measuring tubes 3-1, 6 total temperature sensors 3-3 and 4 static pressure measuring tubes 3-2 arranged on the measuring rake behind the outlet guide vane. The fan nacelle 7 reserves positions for sensor wiring. The total pressure measuring tubes and the static pressure measuring tubes are connected to the data acquisition instrument 8400 device to measure the parameters of total pressure, total temperature and static pressure required for the test, which can be used for pressure ratio calculation. These cross-shaped measuring rakes can be easily disassembled. The outlet guide vane 6 not only guides the outlet air flow of the fan blade 4, but also plays a role of static support.

[0020] In this embodiment, the size of the real aeroengine fan is scaled down to become a fan model. After scaling down, the driving power required for the fan model is reduced. In order to generate the fundamental wave effect, the rotational speed of the fan needs to be increased. The fan model is driven by a high-speed motor with a rotational speed and power matching it. At the same time, a fan nacelle angle-of-attack mechanism is installed at the tail of the high-speed driving motor, which can change the windward angle of the fan nacelle simulation device in the wind tunnel test, realize the simulation of the working state of the aeroengine model for the wing / fan installation effect wind tunnel noise test, and apply it to the wing / fan installation effect wind tunnel noise test.

Claims

1. A fan nacelle simulation device for wind tunnel noise test of wing / fan installation effect, comprising a fan model, a fan model support mechanism, a high-speed drive motor and a nacelle angle-of-attack mechanism. The nacelle angle-of-attack mechanism is fixedly installed on a hydraulic tail support, and is characterized in that, The fan model is a scaled model of a real aircraft engine fan. A plurality of measuring rakes are fixedly installed on the inner wall of the fan model. A total pressure pressure measuring tube, a static pressure measuring tube or a total temperature sensor is installed on the measuring rake to measure the total pressure, total temperature and static pressure parameters required for the test. The fan model is connected to the fan model support mechanism through a flange. The output shaft of the high-speed drive motor drives the blades of the fan model to rotate to achieve the speed, flow rate and pressure ratio required by the test conditions. The nacelle angle of attack mechanism is rotatably connected to the rear end of the high-speed drive motor. The nacelle angle of attack mechanism can change the windward angle of the fan model. The fan model support mechanism includes a shaft sleeve and a transmission shaft. The fan model includes a propeller cap, an acoustic liner, a measuring rake, a fan blade, a hub, an outlet guide vane and a fan nacelle. The propeller cap is installed at the front end of the fan blade, and the fan blade is installed on the hub. The propeller cap, the fan blade and the hub are located inside the fan nacelle. The acoustic liner is installed on the inner wall of the air inlet of the fan nacelle. The transmission The front end of the long shaft is fixedly connected to the wheel hub, the sleeve is sleeved on the transmission long shaft through multiple groups of bearings, the outlet guide vane is installed at the front end of the sleeve, and the front end of the sleeve is also fixedly connected to the inner wall of the fan nacelle. Three groups of measuring rakes are installed on the inner wall of the fan nacelle air inlet, respectively, which are located in front of the fan blades, between the fan blades and the outlet guide vanes, and behind the outlet guide vanes. The rear end of the transmission long shaft is connected to the output shaft of the drive motor, and the rear end of the sleeve is fixedly connected to the shell of the drive motor; the nacelle angle of attack mechanism includes an installation shaft, a connecting rod assembly, a spherical bearing, an electric push rod assembly and an angle of attack mechanism housing, the electric push rod assembly is installed on the angle of attack mechanism housing, the movement direction of the electric push rod assembly is parallel to the axis of the angle of attack mechanism housing, the electric push rod assembly is hinged to one end of the connecting rod assembly through the spherical bearing, and the other end of the connecting rod assembly is connected to the upper end of the rear cover of the high-speed drive motor, and the front end of the angle of attack mechanism housing is hinged to the center of the rear cover plane of the high-speed drive motor through the installation shaft; the measuring rake is a M-shaped rake.

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