压缩机吸气消声器气动噪声辐射特性研究

以某变频压缩机吸气消声器为研究对象,在不同压缩机转速下,研究消声器内流场气动噪声辐射特性。通过仿真分析消声器内部流场和声场,采用FW-H声学模型计算其声场参数,获得噪声源数据,计算气动噪声辐射特性,并与整机测试结果进行对比分析。结果表明,吸气消声器噪声源强度从入口至出口沿气流方向逐渐增大,主要噪声源位于出口附近;随转速增加,噪声源强度逐渐增大;出口和入口的声压级都随转速上升而增大,且声压级的最大值所在频段随转速上升逐渐向高频移动;相同转速下,出口处的声压级高于入口处;消声器气动噪声表现为一种宽频噪声,主要集中于400 Hz至6 000 Hz频段内,吸气消声器气动噪声对压缩机整机噪声影响较大。

Study on Aerodynamic Noise Radiation Characteristics of Compressor’s Suction Mufflers

The aerodynamic noise radiation characteristics of the internal flow field in the muffler under different rotate speeds are studied upon a suction muffler of inverter compressor. In this paper, the simulation analysis of internal flow field and sound field of the muffler was carried out, and sound field parameters were calculated by FW-H acoustical model to obtain noise source data and aerodynamic noise radiation characteristics which were compared with the test results of overall unit. The results showed that the noise source intensity of suction muffler increased gradually from inlet to outlet alongside the airflow direction, and the main noise source was near the outlet. And the faster it rotated, the higher the noise source intensity became. The sound pressure level of both the inlet and outlet increased with the rotating speed raising and the frequency range the maximum sound pressure level located moved to higher frequency too. Under the same rotating speed, the sound pressure level of outlet was higher than that of inlet. The aerodynamic noise of the muffler was a broadband noise concentrated mainly on 400-6000Hz. The total noise of a compressor is highly dependent on the aerodynamic noise of the suction muffler.The aerodynamic noise of the suction muffler has a large effect on the noise of the compressor.