Session: 34-03 Endwall, Seal & Leakage Flows

Paper Number: 82361

82361 - Loss Analysis of Cavity Leakage Flow in a Compressor Cascade 

The cavity flow of shrouded stators is quite complex and not yet completely understood, especially for its loss characteristics. In this paper, a matrix of numerical simulations was designed and conducted to investigate the loss characteristics of the cavity flow in a compressor cascade, with a wide range of incidence, two flow coefficients, and three seal clearances. The effect of the skewed boundary layer was introduced to simulate the practical compressor environment as far as possible. Results show that the total pressure loss coefficient is unable of evaluating the cavity leakage loss correctly since it ignores the temperature rise. With the reduction of the flow coefficient, the entropy loss coefficient and thermal entropy generation rate trend to increase, while the change of the viscous entropy generation rate is dependent on the incidence since the high tangential velocity deteriorates the flow of the pressure side at large negative incidence but significantly improves the flow of the suction side as the incidence increases. In addition, there is a significant difference in loss sensitivity to the seal clearance at various incidences. One of the major reasons is the change of pressure difference between the downstream and upstream. And the other major reason is the distribution difference of the high-loss fluid caused by the variation in the passage vortex. These key findings are able to provide insights leading to reducing the compressor loss due to the cavity leakage flow.  

Presenting Author: He-fang Deng Shanghai Jiao Tong University

Presenting Author Biography: PhD candidate of School of Aeronautics and Astronautics, Shanghai Jiao Tong University

Authors:

He-fang Deng Shanghai Jiao Tong University
Kailong Xia School of Aeronautics and Astronautics, Shanghai Jiao Tong University
Jinfang Teng School of Aeronautics and Astronautics, Shanghai Jiao Tong University
Shaopeng Lu School of Aeronautics and Astronautics, Shanghai Jiao Tong University
Mingmin Zhu School of Aeronautics and Astronautics, Shanghai Jiao Tong University
Xiaoqing Qiang School of Aeronautics and Astronautics, Shanghai Jiao Tong University