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Jet noise active control test platform based on engine nozzle scale model

A technology of engine nozzles and scaled models, which is applied in jet engine testing, gas turbine engine testing, etc., can solve the problems of lack of test platform for active jet flow noise control of aeroengines, limited by the site, high test funds, etc., to achieve test The effect of short preparation time, strong anti-risk ability and low cost

Active Publication Date: 2022-04-05
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0004] The present invention proposes a jet noise active control test platform based on a turbofan engine nozzle scale model. Defects of the test platform for active jet noise control of aero-engines, a jet flow composed of a turbofan engine nozzle scale model, an air supply system, a noise reduction test chamber, a noise spectrum measurement device, an electric valve and a controller is disclosed Noise active control test platform, controlling the size of jet noise radiation by changing the micro-jet flow rate and the configuration angle of the outer guide vane

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  • Jet noise active control test platform based on engine nozzle scale model
  • Jet noise active control test platform based on engine nozzle scale model
  • Jet noise active control test platform based on engine nozzle scale model

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[0024] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0025] The schematic diagram of the jet noise active control test platform based on the turbofan engine nozzle scale model is as follows: figure 1 shown. It consists of a turbofan engine nozzle scale model, air supply system, noise reduction test chamber, noise spectrum measurement device, electric valve and controller. The air supply system adopts a screw air compressor and a high-pressure air tank. By adjusting the opening of the electric valve, the air flow and the micro-jet flow entering the inner and outer ducts are changed. The control signal of the electric valve is given by the controller, which provides a serial Line interface and external data transmission. The size of the jet noise radiation is controlled by the micro-jet flow rate and the configuration and angle of the guide vanes in the outer duct. For the nozzle test piece of ...

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Abstract

The invention relates to a jet flow noise active control test platform based on a scaled model of an engine nozzle, including a scaled model of a turbofan engine nozzle, an air supply system, a noise reduction test chamber, a noise spectrum measuring device, an electric valve and a controller . The size of the jet noise radiation is adjusted by the change of the micro-jet flow rate and the configuration and angle of the guide vane in the outer duct. The test piece is a scale model of the engine nozzle, including the nozzle test piece with micro-jet flow and Nozzle test pieces with various shrouded guide vane configurations. The air supply system adopts a screw air compressor and a high-pressure air tank. By adjusting the electric valve, the air and micro-jet flow into the inner and outer ducts are changed. The noise spectrum measuring device includes a noise spectrum measuring instrument, a microphone array and signal processing software, and online acquisition of sound signal processing and analysis. The scaled model of the nozzle and the noise spectrum measurement device are placed in the test chamber installed with sound-absorbing materials. Advantages: high flexibility, convenient test and low cost.

Description

technical field [0001] The invention relates to an active jet noise control test platform based on a turbofan engine nozzle scale model, and belongs to the technical field of aeroengine noise control. Background technique [0002] Jet flow noise is one of the most important noise sources of aircraft. At present, jet flow noise reduction technology of aero-engines is mostly passive noise control technology, which has little potential to reduce the noise of aero-engines, and most of them have a negative impact on the thrust performance of engines. Since passive noise reduction technology needs to be designed according to the most stringent working conditions and noise indicators, its negative impact on engine thrust performance is more obvious in other working conditions. Micro-jet noise reduction technology is an active noise reduction solution that is feasible for both subsonic and supersonic speeds. On aero-engines, noise reduction is mainly achieved by injecting a small am...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M15/14
CPCG01M15/14
Inventor 黄向华赵晓春孙庆彪冉鹏宇刘乔
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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