离心压气机不稳定特性的研究

Research on the Instability of Centrifugal Compressors

采用实验方法研究了高速离心压气机的流动不稳定特性———失速与喘振。实验中采用了平板叶型扩散器和双圆弧叶型扩散器。通过在流向和周向布置的多个压力测点,详细地观察了小流量下的流场不稳定特性。实验结果表明,在转速30000 r/min的条件下,失速总是出现在喘振之前。但是在转速50000 r/min的条件下,带有双圆弧叶型扩散器的压气机直接进入喘振。根据所测得的压力信号,采用混沌方法分析了失速与喘振的非线性特征。

The flow instability rotating stall and surging —properties of high speed centrifugal compressors has been experimentally investigated. Diffusors with flat plate guide vanes and vanes with the shape of two circular arcs were used during the test. The flow field＇ s instability at low flow volume was observed in detail at pressure sensing points located in flow direction as well circumferentially. Test results show that, at 30,000 r/min, stalling always proceeds surging, but at 50,000 r/min, in case of diffusors fitted with double arc vanes, the surging state is entered directly. The non-linear characteristics of stalling and surging are analyzed with chaos theory methods. Figs 8, table 1 and refs 8.