Experimental Study on Aeroacoustic of Counter-Rotating Propeller in Ground Acoustic Environment

According to the performance evaluation and optimization research requirement of counter-rotating propellers aeroacoustics, based on ground acoustic environment, a set of counter-rotating propeller aeroacoustics test platform was built. The aeroacoustic test of counter-rotating propeller was carried out in a semi-anechoic chamber. The aerodynamic performance and far-field noise characteristics of the counter-rotating propeller were obtained, and the distribution of far-field noise were analyzed. The results show that the tension, torque and power increase with the increase of rotating speed. The amplitude distribution of sound pressure level of far-field noise will move with the change of speed. The discrete noise at each passing frequency is also different. The test platform and the test scheme could provide help for the aeroacoustic evaluation and optimization design of counter-rotating propeller under ground takeoff condition.