基于热色液晶技术的尾迹对涡轮动叶表面换热系数影响研究

推进技术 ›› 2019, Vol. 40 ›› Issue (3): 653-659.

基于热色液晶技术的尾迹对涡轮动叶表面换热系数影响研究

陈大为¹,朱惠人¹,李华太¹,周道恩¹,贾晓萌²

西北工业大学动力与能源学院，陕西西安 710072,西北工业大学动力与能源学院，陕西西安 710072,西北工业大学动力与能源学院，陕西西安 710072,西北工业大学动力与能源学院，陕西西安 710072,北京动力机械研究所，北京 100074

发布日期:2021-08-15
作者简介:陈大为，博士生，研究领域为非定常条件下航空发动机高温部件的传热和冷却。E-mail: 1079673928@qq.com 通讯作者:朱惠人，博士，教授，研究领域为航空发动机的传热和冷却。

Effects of Unsteady Wake on Heat Transfer Distribution of Turbine Blade Using Thermochromic Liquid Crystal Technique

School of Power and Energy，Northwestern Polytechnical University，Xi’an 710072，China,School of Power and Energy，Northwestern Polytechnical University，Xi’an 710072，China,School of Power and Energy，Northwestern Polytechnical University，Xi’an 710072，China,School of Power and Energy，Northwestern Polytechnical University，Xi’an 710072，China and Beijing Power Machinery Institute，Beijing 100074，China

Published:2021-08-15

摘要/Abstract

摘要： 为探究上游尾迹影响下的涡轮动叶表面换热特性，采用热色液晶技术测量了尾迹对光滑叶片表面换热分布的影响，获得了高低湍流度(2%，20%)来流时不同尾迹斯特劳哈尔数(0，0.12，0.36)条件下光滑动叶表面换热系数的实验数据。结果表明:当湍流度为2%时，随着尾迹斯特劳哈尔数增加，压力面换热系数增高幅度最大为142%，前缘区域增高幅度最大为7%，吸力面增高幅度最大为186%。当湍流度为20%时，尾迹对换热系数的影响相对减弱，随着尾迹斯特劳哈尔数增加，压力面换热系数增高幅度最大为10%，前缘区域增高幅度最大为10%，吸力面增高幅度最大为26%。尾迹导致吸力面转捩点提前，过渡区延长。整体看来，尾迹导致光滑叶片表面换热系数升高，对吸力面换热系数的影响大于压力面。

关键词: 尾迹；涡轮动叶；换热系数；斯特劳哈尔数；热色液晶

Abstract: The effects of unsteady wake on the heat transfer coefficient of the turbine blade without film holes is studied using the Thermochromic Liquid Crystal (TLC) measurement technique. The turbulence intensity of the free-stream is 2% and 20% respectively， and the wake Strouhal number is varied from 0 to 0.36. Results show that as the wake Strouhal number increases， the heat transfer coefficient of the pressure surface increases by up to 142%， the heat transfer coefficient of the leading edge increases by up to 7% and that of the suction surface increases by up to 186% for the case of free-stream turbulence intensity Tu=2%. At the case of Tu=20%， the influence of the wake is weakened and the heat transfer coefficient of the pressure surface increases by up to 10%， the heat transfer coefficient of the leading edge increases by up to 10% and that of the suction surface increases by up to 26%. The unsteady wake causes an earlier laminar to turbulent boundary layer transition on the suction surface and the transition length increases. Overall， the wake causes an increase in the heat transfer coefficient of the turbine blade and the effect of wake on the suction surface is greater than that on the pressure surface.

Key words: Wake；Turbine blade；Heat transfer coefficient；Strouhal number；Thermochromic liquid crystal

陈大为,朱惠人,李华太,周道恩,贾晓萌. 基于热色液晶技术的尾迹对涡轮动叶表面换热系数影响研究[J]. 推进技术, 2019, 40(3): 653-659.

CHEN Da-wei¹,ZHU Hui-ren¹,LI Hua-tai¹,ZHOU Dao-en¹,JIA Xiao-meng². Effects of Unsteady Wake on Heat Transfer Distribution of Turbine Blade Using Thermochromic Liquid Crystal Technique[J]. Journal of Propulsion Technology, 2019, 40(3): 653-659.

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