蜗舌间隙对离心泵流动噪声影响的研究

Research on the influence to the flow noise of the centrifugal pumps with different gap between impeller and tongue

应用基于声相似律的旋转流体机械噪声声源分离方法,实现离心泵声源特性与管道声响应特性的分离。通过建立离心泵管道试验系统,根据分离得到的声源特性对蜗舌间隙与离心泵流动噪声源的定量关系进行试验研究。结果表明,当蜗舌间隙由2.5mm增加至5mm,各阶次噪声有大于10dB的下降,当蜗舌间隙超过8.5mm后,间隙的增大不会导致各阶次噪声显著下降。

The acoustic similarity law was applied to separate the noise source of the centrifugal pump and acoustic response function of the duct.An experimental duct system of the centrifugal pump was established.According to the noise source separation,the influence to the flow noise of different blades in centrifugal pump was studied by experiments.The results shows： the discrete noises of the centrifugal pump decrease more than 10 dB when the gap increases from 2.5 mm to 5 mm and they do not decrease significantly anymore when the gap exceeds 8.5 mm.