Jet noise active control test platform based on engine jet pipe scaling model

Abstract

The invention relates to a jet flow noise active control test platform based on an engine jet pipe scaling model. The jet flow noise active control test platform comprises a turbofan engine jet pipe scaling model, an air supply system, a noise reduction test cabin, a noise spectrum measuring device, an electric valve and a controller. The jet flow noise radiation is adjusted through the micro jet flow and the change of the configuration and angle of the outer duct guide vane, and the test piece is a scale model of the engine jet pipe and comprises a jet pipe test piece with micro jet flow and jet pipe test pieces with various outer duct guide vane configurations. The air supply system adopts a screw type air compressor and a high-pressure air tank, and the flow of air and micro jet flow entering the inner duct and the outer duct is changed by adjusting an electric valve. The noise spectrum measuring device comprises a noise spectrum measuring instrument, a microphone array and signal processing software, and is used for processing and analyzing acquired sound signals on line. And the spray pipe scaling model and the noise spectrum measuring device are both placed in a test cabin provided with a sound absorption material. The platform has the advantages of 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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