冲击衬套对于一级静叶气膜孔流量分配和气膜冷却效率的影响  

Influence of Impingement Bush on the Film Hole Mass Flow Distribution and Film Cooling Efficiency of First Stage Vane

作　　者：陈娉婷[1] 李雪英[1] 任静[1] 蒋洪德[1] 

机构地区：[1]清华大学热能工程系,北京100084

出　　处：《工程热物理学报》2015年第8期1662-1665,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51376099)

摘　　要：燃气轮机一级静叶冷却结构非常复杂,要提高燃气轮机的设计水平,在现有的结构和设计的基础上,需要进行更加精细化的设计,需要对多种设计因素进行综合考虑,挖掘现有结构的冷却潜力。本文采用数值计算方法,研究了叶栅环境下,冲击衬套的使用对于一级静叶气膜孔流量分配和气膜冷却效率的影响。结果表明,冲击衬套会影响气膜孔的流量分配,而流量分配是传热的基础。同时,冲击腔会改善气膜孔内的流动,在流量不变的条件下提升气膜冷却效率。The cooling structure of the first vane of gas turbine is very complicated.To improve the design level of gas turbine,a more refined design is necessary based on the existing structure and design.Considering a variety of design factors synthetically is needed to tap potential of existing structure.The influence of impingement bush on the film hole mass flow distribution and film cooling efficiency of first vane was investigated using CFD.The results showed that the existing of impingement bush changed the mass flow distribution of film holes,thus changed the cooling efficiency.The impingement bush improved the flow condition inside film holes,therefore,the film cooling efficiency was lifted.

关 键 词：冲击冷却 流量分配 气膜冷却 

分 类 号：TK474.7[动力工程及工程热物理—动力机械及工程]