非轴对称尖部间隙对轴流压气机性能影响的实验研究

在实际的压气机中,转子尖部间隙总是不同程度地存在着非轴对称性。针对非轴对称尖部间隙对压气机性能的影响,本文设计了一系列结构,在一台亚音速单、双级轴流压气机实验台上对其孤立转子进行了实验研究,分析和比较了各种结构形式对压气机性能的影响。实验表明,非轴对称尖部间隙的存在,将使压气机的稳态和过失速性能下降。 

Effects of Asymmetric Tip Clearance on Axial Flow Compressor Performance

Asymmetry of rotor tip clearance in compressors always exists to some extent.To investigate the effects of rotor tip clearance asymmetry on compressor performances,a series of nonaxisymmetric tip clearance casing configurations were designed and experimented on a low speed,axial flow compressor with a single rotor.For each geometry,experiments were taken under both 5059 r/min and 8130 r/min conversion velocities.According to the experiments,several phenomena could be obtained:(1) With tip clearance asymmetry increasing,the stall points on compressor performance curves shifted to the lower right,compared with the solid casing and symmetric tip clearance.To evaluate such shifting effects quantitatively,two parameters were defined.(2) With tip clearance asymmetry increasing,the average stall performance was also decreased.(3) On the other hand,however,the size of the stall-unstall hysteresis loops on the performance map decreased with the increasing of the tip clearance asymmetry,which showed that it was easier for the compressor to recover from stall.As a whole, the experimental results showed that,such treated casings were detrimental to the compressor performances.