Effects of mid-passage gap with a variable surface angle on a turbine vane endwall’s aerothermal and film cooling performances

作     者：Zhiyu LI Kaiyuan ZHANG Zhigang LI Jun LI Zhiyu LI;Kaiyuan ZHANG;Zhigang LI;Jun LI

作者机构：Institute of TurbomachineryXi’an Jiaotong UniversityXi’an 710049China 

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

年 卷 期：2024年第37卷第6期

页      面：20-37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] 0817[工学-化学工程与技术] 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] 0703[理学-化学] 0825[工学-航空宇航科学与技术] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by the National Science and Technology Major Project,China(No.J2019-II-0011-0031) the National Natural Science Foundation of China(No.51936008) 

主　　题：Film cooling Heat transfer Surface angle Mid-passagegap Turbinevane endwall 

摘      要：The mid-passage gap is an inevitable structure in a vane passage due to turbine vanes being manufactured *** coolant from this gap is able to prevent hot mainstream ingression and provide cooling protection for the endwall.A novel idea of enlarging the endwall’s coverage area and reducing the endwall’s thermal load by applying the mid-passage gap with variable surface angles is carried out in this *** endwall’s aerothermal and film cooling performances under four mid-passage gap modes at three typical mass flow ratio conditions are numerically *** indicate that under the traditional mid-passage mode,the coolant flows into the mainstream with a perpendicular incidence angle and can’t stick to the ***,cooling failure occurs,and the endwall’s thermal load is badly *** film cooling level at the suction-side endwall is improved when applying the mid-passage gap of a 45
surface angle due to the secondary vortex being *** addition,when applying the mid-passage gap of a 135
surface angle,the horseshoe vortex is pushed away,and the coverage area at the pressure-side endwall is enlarged *** best film cooling performance is achieved when the upstream surface angle is 135
and the downstream surface angle is 45
due to the adiabatic film cooling effectiveness being increased at both the pressure-and suction-side *** the mass flow ratio is 1.5%,the coverage area is enlarged by 43%,and the area-averaged adiabatic film cooling effectiveness is increased by 37%,when compared with those under the traditional mid-passage mode.