Analysis and control of tip-leakage vortex core stability of turbine rotor

作者：Wei, Zuojun; Duan, Wenhua; Qiao, Weiyang; Liu, Jian; Han, Pinlian

来源：Journal of Aerospace Power, 2018, 33(9): 2139-2149.

DOI：10.13224/j.cnki.jasp.2018.09.011

• Aerodynamic loss
• Analysis and controls
• Centrifugal instability
• Stability control
• Stability mechanisms
• Suction surfaces
• Tip leakage vortex
• Vortex cores

The feature of tip-leakage vortex breakdown and the stability mechanism were analyzed and summarized using the first-stage rotor blade of GE-E3turbine. The study indicated that: the breakdown of tip-leakage vortex core was caused by vortex's centrifugal instability;the vortex core expanded rapidly after losing stability and reversed flow was formed;the vortex core stability depended on two factors: swirling number and reversed pressure gradient. After that, the control of tip-leakage loss was carried out from the perspective of vortex core stability. Calculations show that: moving forward the loading of tip blade profile can reduce the pressure gradient;employing straight profile on the suction surface after passage throat can directly decrease the profile diffuse factor;and the redesigned blade by those two methods can obviously weaken the tip-leakage vortex, suppress the instability of vortex core and decrease the tip-leakage losses.

• 出版日期2018-9-1
• 单位西北工业大学; 华南理工大学