Aeroacoustic test system design and experimental research for counter-rotating propeller
The aerodynamic noise test of counter-rotating propellers in wind tunnels has the problems of difficult time coordination and high cost.The aerodynamic noise test system of counter-rotating propellers,which is capable of simulating the driving state of counter-rotating propellers on the ground,is developed by relying on the acoustic environment of the ground.The aerodynamic noise test is carried out on a perforated counter-rotating propeller and a reference propeller to validate the test system and evaluate the noise reduction effect of the perforated counter-ro-tating propeller.The results show that the perforated counter-rotating propeller can effectively reduce the noise un-der the prerequisite of guaranteeing the aerodynamic performance in the range of the tested working conditions.In the 90° pointing angle,which has the most significant effect on the aircraft cabin,the noise reduction at the second-order passing frequency reaches 5 dB.The designed aerodynamic noise test system can provide assistance for the evaluation of aerodynamic noise of the counter-rotating propeller and the design of noise reduction.
counter-rotating propelleraeroacousticsperforated structurefar field noisenoise reduction design
万方数据
维普
