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Investigation on shock-induced separation loss mitigation method considering radial equilibrium in a transonic compressor rotor

Published online by Cambridge University Press:  09 March 2022

Y. Liu
Affiliation:
Institute of Engineering Thermophysics, Chinese Academy of Sciences,Beijing, China School of Aeronautics and Astronautics, University of Chinese Academy of Sciences,Beijing, China
Q. Zhao*
Affiliation:
Institute of Engineering Thermophysics, Chinese Academy of Sciences,Beijing, China Innovation Academy for Light-duty Gas Turbine, Chinese Academy of Sciences,Beijing, China School of Aeronautics and Astronautics, University of Chinese Academy of Sciences,Beijing, China
W. Zhao
Affiliation:
Institute of Engineering Thermophysics, Chinese Academy of Sciences,Beijing, China Innovation Academy for Light-duty Gas Turbine, Chinese Academy of Sciences,Beijing, China School of Aeronautics and Astronautics, University of Chinese Academy of Sciences,Beijing, China
Q. Zhou
Affiliation:
Institute of Engineering Thermophysics, Chinese Academy of Sciences,Beijing, China Innovation Academy for Light-duty Gas Turbine, Chinese Academy of Sciences,Beijing, China
J. Xu
Affiliation:
Institute of Engineering Thermophysics, Chinese Academy of Sciences,Beijing, China Innovation Academy for Light-duty Gas Turbine, Chinese Academy of Sciences,Beijing, China School of Aeronautics and Astronautics, University of Chinese Academy of Sciences,Beijing, China
*
*Corresponding author. Email: zhaoqingjun@iet.cn

Abstract

A shock-induced separation loss reduction method, using local blade suction surface shape modification (smooth ramp structure) with constant adverse pressure gradient with the consideration of radial equilibrium effect to split a single shock foot into multiple weaker shock wave configuration, is investigated on the NASA Rotor 37 for promoting aerodynamic performance of a transonic compressor rotor. Numerical investigation on baseline blade and improved one with blade modification on suction side has been conducted employing the Reynolds-averaged Navier–Stokes method to reveal flow physics of ramp structure. The results indicate that the passage shock foot of baseline is replaced with a family of compression waves and a weaker shock foot generating moderate adverse pressure gradient on ramp profile, which is beneficial for mitigating the shock foot and shrinking flow separation region as well. In addition, the radial secondary flow of low-momentum fluids within boundary layer is decreased significantly in the region of passage shock-wave/boundary-layer interaction on blade suction side, which mitigates the mass flow and mixing intensity of tip leakage flow. With the reduction of flow separation loss induced by passage shock, the adiabatic efficiency and total pressure ratio of improved rotor are superior to baseline model. This study herein implies a potential application of ramp profile in design method of transonic and supersonic compressors.

Type
Research Article
Copyright
© The Author(s), 2022. Published by Cambridge University Press on behalf of Royal Aeronautical Society

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