Hybrid LES/RANS Simulations of Compressible Flow in a Linear Cascade of Flat Blade Profiles  

作　　者：Jaromír PRIHODA Petr STRAKA David SIMURDA Petr SIDLOF Jan LEPICOVSKY 

机构地区：[1]Institute of Thermomechanics of the Czech Academy of Sciences,Dolejskova 1402/5,18200 Prague 5,Czech Republic [2]Aerospace Research and Test Centre,Beranovych 130,19905 Prague,Czech Republic [3]Technical University of Liberec,Faculty of Mechatronics,Studentska 2,46117 Liberec 1,Czech Republic

出　　处：《Journal of Thermal Science》2024年第5期1839-1850,共12页热科学学报（英文版）

基　　金：supported by the Czech Science Foundation(GACR)(Grant No.20-11537S);Institutional support RVO:61388998。

摘　　要：The paper reports on 3D numerical simulations of unsteady compressible airflow in a blade cascade consisting of flat profiles using a hybrid LES/RANS approach including a transition model.As a first step towards simulation of blade flutter in turbomachinery,various incidence angle offsets of the middle blade were modeled.All simulations were run for the flow regime characterized by outlet isentropic Mach number M_(is)=0.5and zero incidence.The results of the LES/RANS simulations(pressure and Mach number distributions)were compared to a baseline RANS model,and to experimental data measured in a high-speed wind tunnel.The numerical results show that both methods overpredict flow separation taking place at the leading edge.In this regard,the hybrid LES/RANS method does not provide superior results compared to the traditional RANS simulations.Nevertheless,the LES/RANS results also capture vortex shedding from the blunt trailing edge.The frequency of the trailing edge vortex shedding in CFD simulations matches perfectly the spectral peak recorded during wind tunnel measurements.

关 键 词：numerical simulation blade cascade hybrid LES/RANS 

分 类 号：TK05[动力工程及工程热物理]