绝热气膜冷却效率的传热传质类比数值分析  

Numerical analysis of heat-mass transfer analogy for adiabatic film-cooling effectiveness

作　　者：姚家旭 罗丁 范青 张科[1] 雷蒋[1] 马元[2] YAO Jiaxu;LUO Ding;FAN Qing;ZHANG Ke;LEI Jiang;MA Yuan(State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace,Xi'an Jiaotong University, Xi'an 710049, China;Xi'an Aerospace Propulsion Institute, Xi'an 710100, China)

机构地区：[1]西安交通大学航天航空学院机械结构强度与振动国家重点实验室,陕西西安710049 [2]西安航天动力研究所,陕西西安710100

出　　处：《火箭推进》2021年第1期62-69,共8页Journal of Rocket Propulsion

基　　金：国家自然科学基金(5177615);国家科技重大专项(2017-III-0009-0035);西安市科技计划(201805034YD12CG18(3))。

摘　　要：为验证不同温度条件下的传热传质类比是否有效,应用CFD模拟方法分析了密度比(Rd)为1.5和2.5、吹风比为0.5和1.5工况下的平板双射流气膜冷却结构。双射流孔间流向距离(Ds/d)为3.0,横向距离(Dp/d)为1.0。通过传热和传质方法分别得到了气膜冷却效率。分析结果表明:传质方法与传热方法所获得的气膜冷却效率结果差距较小,二者偏差的主要原因是流体的热导率。CFD simulation methods were employed to analyze the double-jet film-cooling structure on a flat plate with the density ratio of 1.5 and 2.5, and the blowing ratio of 0.5 and 1.5, in order to check the validity of heat-mass transfer analogy at different temperature conditions. The streamwise distance(D_s/d) between the double-jet holes was 3.0 and the spanwise distance(D_p/d) was 1.0. The film-cooling effectiveness was acquired from heat-transfer and mass-transfer methods. The results show that, the difference in film-cooling effectiveness results from mass transfer and heat transfer methods is rather small. The main reason that leads to the difference between the two methods is the heat conductivity of the fluid.

关 键 词：气膜冷却 双射流 绝热气膜冷却效率 传热传质类比 密度比 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]