Analysis of the dominant frequency in a subsonic compressor stator at near stall condition

作者：Shi Ke; Fu Song^*

来源：Chinese Science Bulletin, 2014, 59(1): 23-28.

DOI：10.1007/s11434-013-0026-3

• Hybrid RANS/LES
• Compressor stator
• Blade stall
• Leakage flow

IDDES method was applied to investigate the highly unsteady flow in a subsonic compressor stator with very large hub clearance and high incidence angle. The blade loading variation frequency was found close to the rotating instability (RI) frequency f (RI) a parts per thousand 333 Hz observed in the experiment. Detailed analysis of the flow physics shows that the loading variation is caused by the periodic swing of the large scale separated flow on the blade suction side surface. The breakdown of the leakage vortex has no significant dominant frequencies, thus cannot be the cause of RI in this compressor stator as normally believed. Furthermore, the vortex shedding and vortex breakdown due to shear layer instability at the outer edge of the blade suction surface separation region excite high frequency unsteadiness that can form the sources of noise.

• 出版日期2014-1
• 单位清华大学