高速气流中传声器探管声学特性的实验研究

本文通过气流马赫数M=0~0.8风速下的研究了在高速气流中进行声学测量用的开缝式传声器探管的声学特性。结果表明,探管缝口覆盖材料的声流阻对探管的声学特性影响很大;在探管内放入一根吸声内管可以改善探管的声学特性,另外指出,探管的静、动态标定对于气流中声学测量结果的修正具有重要意义。

Experimental investigation of acoustic characteristic of microphone slit-probe in high speed flow

In this paper, the acoustic characteristic of microphone slit-probe in high speed flow, with Mach number up to 0.8, was investigated experimentally. Results show that the acoustic flow resistance of the cover-cloth of the slit-probe has a significant influence to the acoustic characteristic of the probe,and that the frequency response of acoustic sensitivity can be smoothed by inserting a additional pipe filled with absorbent material inside the probe. Experiment also indicates that the static and dynamic calibraions of probe are important to the correction of the acoustic measurment in high speed flow.