Numerical simulations on circumferential propagating characteristics of tip leakage flow oscillation in compressor

作者：Wang, Hao; Wu, Ya Dong; Ouyang, Hua

来源：Journal of Aerospace Power, 2017, 32(3): 538-548.

DOI：10.13224/j.cnki.jasp.2017.03.004

• Field fluctuations
• Frequency spectrum analysis
• Low speed axial compressor
• Numerical investigations
• Phase lags
• Propagating characteristics
• Tip leakage flow
• Tip leakage vortex

Through numerical investigations on the characteristics of tip leakage flow oscillation in a low speed axial compressor, it was found that at large flow rate conditions, the tip flow field did not vary with time. As flow rate decreased, the tip flow field gradually started to fluctuate, meanwhile the tip leakage flow oscillated periodically, showing that the origin position, vortex structure pattern and impinging position on the pressure surface of neighboring blade changed with time. The tip leakage vortex and its detached vortex induced low pressure regions on the neighboring blade surface, leading to the oscillation of pressure distribution in blade tip region. Then this also affected the generation of the tip leakage flow in the neighboring passages. The interaction effect of tip leakage flow and the neighboring blade was the main cause of the tip flow field fluctuation. Furthermore, the tip leakage flow oscillations had phase lag between neighboring blade passages, which induced a flow disturbance with non-blade-number periodicity propagating circumferentially around the rotor.

• 出版日期2017
• 单位上海交通大学