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

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...

AI Technical Summary

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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