Very-large eddy simulation of the rotational effects on turbulent flow in a ribbed channel  

作　　者：Hao QIAN Tao GUO Xing-si HAN Jun-kui MAO 

机构地区：[1]College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China [2]Shanghai Academy of Spaceflight Technology(SAST),Shanghai 201109,China [3]Key Laboratory of Aero-engine Thermal Environment and Structure,Ministry of Industry and Information Technology,Nanjing 210016,China

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2021年第7期564-584,共21页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：the National Natural Science Foundation of China(No.91841302);the Jiangsu Provincial Natural Science Foundation of China(No.BK20200069);the Shanghai Academy of Spaceflight Technology(SAST)Innovation Fund;the Fundamental Research Funds for the Central Universities,China。

摘　　要：For the simplified model of the internal cooling passage in the turbine blade of an aero-engine,the present study applies a newly developed turbulence modeling method,very-large eddy simulation(VLES),for analyzing rotational effects on the characteristics of complex turbulent flow.For comparison,not only are the delayed detached eddy simulation(DDES)method(recognized as one of the most popular hybrid Reynolds-averaged Navier-Stokes–large eddy simulation(RANS-LES)methods)and the LES method used with the same numerical setup,but also three RANS turbulence models,including the k-ωshear stress transport(SST),standard k-ε,and Reynolds stress models,are applied to analyze the flow structure in the ribbed channel(whether rotating or stationary).Complex turbulent flows in a square ribbed channel at high Reynolds number of 100000 in the stationary state and different rotational numbers(Ro)between 0.1 and 0.4 are simulated and analyzed in detail.The comparisons show that when compared with the experimental data the VLES method works best in both the stationary and rotating states.It can capture unsteady flow characteristics such as wall shear layer separation and the vortex structure resulting from the rib disturbance.The DDES method can only capture the larger-scale vortex structures,and its predictions of the time-averaged velocity differ considerably from experiments,especially in the stationary state.With a relatively coarse grid,satisfactory prediction cannot be achieved in either rotating or stationary state by the LES method with wall-adapting local eddy-viscosity(WALE)and dynamic Smagorinsky models.The three RANS models perform poorly in both the stationary and rotating states.The results demonstrate the advantages of the VLES method in analyzing the unsteady flow characteristics in the ribbed channel at high Reynolds numbers for both stationary and rotating conditions.On that basis,the study uses the VLES method to analyze the flow evolution under different rotational numbers,and the rotational effects on the

关 键 词：Very-large eddy simulation(VLES) Rotation effect Ribbed channel flow Unsteady flow Turbine blade 

分 类 号：TK14[动力工程及工程热物理—热能工程] V235.1[航空宇航科学与技术—航空宇航推进理论与工程]