Large Eddy Simulation of Unsteady Flow Mechanism in Low Pressure Turbine Cascade

被引：0
|
作者：
Wang Y. [1 ]
Cui K. [2 ]
Song Y. [3 ]
Chen F. [3 ]
机构：
[1] School of Transportation and Vehicle Engineering, Shandong University of Technology, Zibo
[2] CRRC Zhuzhou Electric Co., Ltd., Zhuzhou
[3] School of Energy Science and Engineering, Harbin Institute of Technology, Harbin
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2020年 / 40卷 / 24期
关键词：
Aerodynamic loss; Boundary layer separation; Cascade; Large eddy simulation; Low pressure turbine; Natural transition;
D O I：
10.13334/j.0258-8013.pcsee.191970
中图分类号：
学科分类号：
摘要：
In order to deeply understand the spatio- temporal evolution of unsteady flow in a high-load low pressure turbine cascade, a large eddy simulation program of compressible Navier-Stokes equations based on dynamic Smagorinsky model was developed. The Mach number was 0.4 and Reynolds number at the outlet was 0.6×105 (based on isentropic expansion process). The distribution of time- averaged wall-static pressure coefficient and total pressure loss coefficient agreed well with experiment and direct numerical simulation results. The numerical results show that the transition process of the fluid in suction side boundary layer is close to natural transition at low Reynolds number. In the transient flow field, the boundary layer near the rear part of the suction side subjected to intermittent separation and reattachment. More than one separation bubble existed on the cascade surface. The separation zone was just the accumulation area of low-energy fluid rather than the region of aerodynamic loss source. © 2020 Chin. Soc. for Elec. Eng.
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页码：8082 / 8089
页数：7
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