Experimental acoustic characterization of phase-synchronized propellers

Acoustic measurements were performed in an aeroacoustic wind tunnel with a
distributed electric propulsion (DEP) system. These tests involved adjusting relative
propeller phase angles from 0° to 90° in increments of 15°. A range of advance ratios
(J = 0 − 0.47) were investigated at a fixed propeller rotation speed of 5000 rpm. The
investigation explored the impact on noise directivity and frequency characteristics.

本研究的声学测量实验在搭载分布式电力推进（distributed electric propulsion, DEP）系统的气动声学风洞（aeroacoustic wind tunnel）中开展。本次实验以15°为步长，将螺旋桨相对相位角调整至0°至90°区间内的各取值；在螺旋桨转速固定为5000 rpm的条件下，对取值范围为0~0.47的前进比（advance ratio）J进行了测试。本探究旨在考察上述参数变化对噪声指向性与频率特性的影响。