A numerical study of segmented cooling-stream injection in supersonic film cooling

作     者：Hang NI Mingjun WANG Peixue JIANG Wei PENG Yinhai ZHU Hang NI;Mingjun WANG;Peixue JIANG;Wei PENG;Yinhai ZHU

作者机构：Institute of Nuclear and New Energy TechnologyCollaborative Innovation Center of Advanced Nuclear Energy TechnologyKey Laboratory of Advanced Reactor Engineering and Safety of Ministry of EducationTsinghua UniversityBeijing 100084China School of Nuclear Science and TechnologyXi’an Jiaotong UniversityXi’an 710049China Department of Energy and Power EngineeringKey Laboratory for Thermal Science and Power Engineering of Ministry of EducationTsinghua UniversityBeijing 100084China Tsinghua University-Zhang Jiagang Joint Institute for Hydrogen Energy and Lithium-Ion Battery TechnologyTsinghua UniversityBeijing 100084China 

出 版 物：《Chinese Journal of Aeronautics》 (中国航空学报（英文版）)

年 卷 期：2022年第35卷第6期

页      面：156-171页

核心收录：

学科分类：080704[工学-流体机械及工程] 082502[工学-航空宇航推进理论与工程] 08[工学] 0807[工学-动力工程及工程热物理] 0825[工学-航空宇航科学与技术] 

基　　金：co-supported by the National Key R&D Program of China (No. 2018YFB1900500) the National S&T Major Project of China (No. J2019-Ⅲ-0019-0063) 

主　　题：Film cooling Mach number Segmented injection Shock wave Supersonic flow 

摘      要：The present study proposes a segmented cooling-stream injection structure based on a certain coolant mass flow rate,and numerically investigates the effect of segmented cooling-stream injection on supersonic film *** results indicate that without shock-wave impingement and with helium as the coolant,segmented cooling-stream injection can reduce the mixing between the mainstream and the cooling stream to produce better cooling performance than single injection,especially at larger coolant Mach ***,with nitrogen as the coolant,the cooling effect of the segmented-injection system is very close to that of the single-injection *** at the impinging region is enhanced significantly when there is an incident shock *** the shock wave impinges between the two coolant inlets,segmented cooling-stream injection improves film cooling effectiveness in the midstream and downstream regions more than single injection because only part of the cooling stream undergoes the enhanced mixing effect of the shock *** advantage of segmented injection is reduced when the impinging region is behind the second coolant *** further downstream the impinging region,the smaller the associated advantage.