透平静叶叶身全覆盖气膜冷却有效度实验研究  

An Experimental Investigation of Full Coverage Film Cooling Effectiveness of a Turbine Vane

作　　者：胡可欣 张振[1] 苏欣荣 袁新[1] HU Kexin;ZHANG Zhen;SU Xinrong;YUAN Xin(Department Energy and Power Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学能源与动力工程系,北京100084

出　　处：《工程热物理学报》2023年第7期1793-1799,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金面上项目(No.51876098);国家科技重大专项(No.2017-III-0009-0035)。

摘　　要：燃气轮机透平叶片气膜冷却性能受到吹风比、曲率、压力梯度等多种因素的影响。本文采用压力敏感漆(PSP)技术研究了燃气轮机静叶气膜冷却的冷却性能,实验测量了不同吹风比下全覆盖气膜的冷却有效度,并结合单排孔冷却的实验结果进行分析。结果表明:随吹风比增大,压力面冷却有效度递增,吸力面受曲率和压力梯度影响,冷却有效度先递增后递减;前缘射流在低吹风比下附壁效果较好,高吹风比下由于复合角造成冷气向中叶展汇聚;通过对比单排冷却的叠加结果与全覆盖实验结果的误差,研究了Sellers叠加模型在叶栅条件下的适用性。The performance of film cooling on a turbine vane is affected by many factors such as blowing ratio,surface curvature,and pressure gradient.In this paper,the Pressure Sensitive Paint(PSP)measurement technique is used to measure the film cooling effectiveness of gas turbine guide vane.The full coverage film cooling effectiveness in the blowing ratio(0.5~2.5)have been measured in experiments,and the results of single-row flm cooling effectiveness are analyzed.The results are as follow:With the increase of blowing,the film cooling effectiveness of the pressure surface increases.While such of suction surface first increases and then decreases because of surface curvature and pressure gradient.The jet fow has a better attachment effect to the surface in leading edge region under low blowing ratio,while the compound angle lead to convergence towards the mid-plane of vane under high blowing ratio.By comparing the superposition results with the full coverage experiment,the applicability of Sellers model to the vane cascade condition is studied.

关 键 词：燃气轮机 气膜冷却 吹风比 压力敏感漆 

分 类 号：TK124[动力工程及工程热物理—工程热物理]