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为了确定离心压气机失速先兆形成的原因,分析蜗舌与失速先兆位置的关系,采用数值计算方法对高速小流量离心压气机失速先兆特征进行了研究。计算结果表明:失速过程中流场结构的变化说明了离心压气机出现的是脉冲波失速先兆,离心压气机失速先兆现象由蜗舌对气流的阻滞作用诱发,蜗壳内部流场在周向55°附近区域出现高静压区域,高静压区域形成的扰动通过前倾后弯的叶轮通道逆向传播至叶轮进口,从而在进口周向115°附近出现失速先兆。
In order to determine the causes of the airstream stall in centrifugal compressor and analyze the relationship between the volute tongue and the position of stalling arson, the characteristics of stalling precursors of high speed and low flow centrifugal compressor were studied by numerical calculation. The calculation results show that the change of the flow field structure during the stalling process shows that the occurrence of the pulse compressor in the centrifugal compressor is a precursor of the pulse wave stall. The phenomenon of the stall of the centrifugal compressor is induced by the blockage of the volute tongue by the volute tongue. A high hydrostatic pressure region appears in the vicinity of 55 °, and the disturbance caused by the high hydrostatic pressure region propagates reversely to the impeller inlet through the impeller channel of the forward-backward bend so that a precursor of stall occurs in a vicinity of 115 ° in the circumferential direction of the inlet.