轴向间距对压气机失速特性的影响

EFFECTS OF AXIAL SPACING ON COMPRESSOR STALLING CHARACTERISTICS

采取在静子叶片表面埋入微型压力传感器的方法,对叶尖、叶中和叶根三个截面上的动态压力进行测量,实验研究了六个轴向间距下压气机的旋转失速特性。实验结果表明:轴向间距对压气机失速点的流量系数影响很大,转静子轴向间距减少,压气机失速推迟;压气机刚进入旋转失速的模态与轴向间距有关,轴向间距较大时,压气机首先进入多团全叶高旋转失速,当轴向间距为21％CR时,压气机直接进入单团全叶高旋转失速;轴向间距不同,近失速点的压力扰动也存在差别。

In order to investigate the impact of the rotor-to-stator axial spacing on the compressor stalling characteristics, experimental studies for characteristics of the low speed research compressor with different rotor/stator gaps had been carried out. The pressure dynamic proceedings of three cross-section of the stator surface had been investigated. Results show that the axial spacing strongly affects the stall flow coefficient. As the axial spacing of the successive blade rows decreases, the compressor postpones the onset of stall instabilities. The stall pattern when compressor enters just now into unstable condition is related to the axial spacing. For 21%CR compressor directly enters into single cell rotating stall and for other configurations the compressor firstly works in multi-cell rotating stall. The disturbance wave propagating speed is different depending on the rotor-stator gap.