Effect of Incoming Vortex on Secondary Flows in Turbine Cascades with Planar and Non-Axisymmetric Endwall

作     者：CAO Zhiyuan WANG Chuxuan SONG Zhigao GAO Xi ZHAO Wei LIU Bo CAO Zhiyuan;WANG Chuxuan;SONG Zhigao;GAO Xi;ZHAO Wei;LIU Bo

作者机构：School of Power and EnergyNorthwestern Polytechnical UniversityXi'an 710072China National Key Laboratory of Science and Technology on Aerodynamic Design and ResearchNorthwestern Polytechnical UniversityXi'an 710072China Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100080China School of Aeronautics and AstronauticsUniversity of Chinese Academy of SciencesBeijing 100080China 

出 版 物：《Journal of Thermal Science》 (热科学学报（英文版）)

年 卷 期：2024年第33卷第1期

页      面：138-157页

核心收录：

学科分类：080703[工学-动力机械及工程] 080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by National Science and Technology Major Project (J2019-Ⅱ-0011-0031) the foundation of National Key Laboratory of Science and Technology on Aerodynamic Design and Research (No. D5150230005) the Practice and Innovation Funds for Graduate Students of Northwestern Polytechnical University (No.PF2023091) National Natural Science Foundation of China (No.51806174) 

主　　题：non-axisymmetric endwall secondary flow incoming vortex passage vortex stage environment 

摘      要：Non-Axisymmetric Endwall Profiling(NAEP) is commonly utilized in turbines to eliminate secondary ***,most of the NAEP methods consider a single-blade row environment without incorporating the effect of the stage *** paper aims to investigate the influence mechanism of the incoming vortex on the endwall secondary flow structures of NAEP in a highly loaded turbine *** model the incoming vortex in a stage environment,this study considers a half-delta wing as the vortex generator at the upstream of the turbine *** NAEP is then carried out for a highly loaded turbine cascade with an in-house numerical optimization design platform subject to no incoming *** simulation is also carried out under the influence of the incoming vortex for the turbine cascades with both planar and non-axisymmetric *** paper furthers investigated the pitchwise effect of the incoming vortex on the near endwall secondary *** results indicate that the NAEP effectively improves the endwall secondary flow of the turbine cascade,where the total pressure loss coefficient and the secondary kinetic energy(SKE) are reduced by 7.3%,and 45.7%,*** is further seen that with the incoming vortex,the NAEP achieves a considerable control effect on the endwall secondary flow of the turbine *** incoming vortex,the NAEP can still achieve considerable control effect on the endwall secondary flow of the turbine cascade;the averaged reductions of loss coefficient and SKE are 7.8% and 14.2%,*** some pitchwise locations,incoming vortex can suppress the convection of cross-passage flow toward the suction corner greatly and reduce the loss coefficient of the baseline *** incoming vortex at 4/7 pitch impinged right at the blade leading edge,leading to the generation of low-momentum fluid,which increased the size and the strength of the horseshoe *** all the pitchwise locations,NAEP can suppress the seco