不同开度可调涡轮导叶前缘气膜冷却效果研究  

Leading edge film cooling effectiveness of variable turbine guide vane with different opening degrees

作　　者：靳合龙 白晓辉 张振华 李鹏刚 陈磊 刘存良[1] JIN Helong;BAI Xiaohui;ZHANG Zhenhua;LI Penggang;CHEN Lei;LIU Cunliang(School of Power and Energy,Northwestern Polytechnical University,Xi’an 710129,China;AECC Sichuan Gas Turbine Establishment,Chengdu 610500,China)

机构地区：[1]西北工业大学动力与能源学院,西安710129 [2]中国航发四川燃气涡轮研究院,成都610500

出　　处：《燃气涡轮试验与研究》2024年第2期19-28,共10页Gas Turbine Experiment and Research

基　　金：航空发动机及燃气轮机基础科学中心项目(P2022-B-Ⅱ-026-001);陕西省创新能力支撑计划(2023-CX-TD-19)。

摘　　要：针对变循环发动机的可调低压涡轮导叶开展了不同开度下的前缘气膜冷却效果研究。采用数值仿真的方法,研究了5种典型导叶开度下的导叶表面压力系数分布规律,探究了开度与冷气吹风比对叶片前缘气膜出流特性和覆盖特性的影响规律。结果表明:导叶开度的减小导致前缘的气动驻点位置向压力面方向移动,造成前缘冷气射流更多地流向吸力面侧,使吸力面气膜冷却效率提高;此外,导叶开度的减小导致吸力面与压力面的冷气贴壁效果都有提高,但两者的具体机理不同。导叶开度的变化对前缘气膜孔最佳吹风比影响较小,不同开度下的最佳吹风比都在1.0附近。由于导叶开度为0°时滞止线位于气膜孔排4之上,堵塞效应显著,与开度为5°、−5°条件相比,面平均气膜冷却效率降低了13.6%。The study on leading edge film cooling characteristics of a variable low-pressure turbine guide vane in a variable cycle engine has been carried out.With 5 typical opening degrees,the pressure coefficient distribution on the surface of the guide vane has been studied by numerical simulation.Subsequently,the influence of opening degree and blowing ratio on the variation of film cooling effectiveness and coverage characteristics has been investigated.The results indicate that the position of the aerodynamic stationary point of the leading edge is shifted towards the pressure side by reducing the opening degree of the adjustable guide vane.As a result,the leading edge coolant air flows more towards the suction side,increasing the cooling efficiency of the suction surface.Furthermore,the reduction of opening degree causes an improvement in the coolant air advection effect on both suction and pressure sides,but the two mechanisms are different.Changing the opening degree has little impact on the optimum blowing ratio of the leading edge film holes,and optimum blowing ratios(M)under different openings are all around M=1.0.Since the stationary line is above film hole row 4 atθ=0°,the blocking effect is significant,reducing the surface average air film cooling efficiency by 13.6%compared to that of openings atθ=5°and−5°.

关 键 词：变循环发动机 可调低压涡轮导叶 气膜冷却 导叶开度 吹风比 

分 类 号：V231.3[航空宇航科学与技术—航空宇航推进理论与工程]