Abstract: The gas chamber pressure, throat flow rate and the acoustic characteristics of an airflow modulator were analyzed by using the theory of fluid mechanics and aeroacoustics. The computation results are compared with the experimental results. The changes of the throat acoustic amplitude with gas supply pressure, gas supply flow rate and working frequencies were given. The results show that the computation results can agree with the experimental results, and the throat acoustic amplitude can be improved with the increase of the gas supply pressure and flow rate.

Key words: acoustics, airflow modulator, throat, low-frequency

摘要： 采用流体力学和声学相关原理，分析圆孔转动型气流调制器气室压力、喷口流量和喉道声波特性。理论计算与实验结果进行了对,并给出喉道声波的声压级随供气压力、供气流量和工作频率改变的变化规律。结果表明理论计算与实验结果基本符合，增大供气压力和流量可提高喉道声波强度。该分析方法对气流调制器设计有一定的指导意义。

关键词: 声学, 气流调制器, 喉道, 低频