燃烧室温度剖面对非轴对称端壁冷却的影响  

Influence of Combustor Outlet Profile on a Contoured Vane Endwall Cooling

作　　者：陈娉婷[1] 李雪英[1] 任静[1] 蒋洪德[1] CHEN Ping-Ting;LI Xue-Ying;REN Jing;JIANG Hong-De(Department of thermal engineering,Tsinghua University,Beijing 100084,China)

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》2019年第1期191-197,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51376099)

摘　　要：为了降低污染物排放,燃气轮机燃烧方式的改变带来透平进口温度分布的改变,给透平端壁冷却带来压力;同时,为了降低二次流损失,非轴对称端壁结构被应用于端壁上;燃烧室与一级静叶之间的缝隙泄漏流冷却是一种典型的端壁冷却形式。本文根据真实燃气轮机透平入口温度条件,抽象出三种代表性的燃烧室出口温度剖面,分别比较其在非轴对称端壁和平端壁条件下对端壁冷却的影响。结果表明,燃烧室温度剖面对端壁前缘附近和压力面附近的温度分布影响较大;非轴对称端壁几何条件会增加下游压力面附近的端壁温度,同时也会改变缝隙泄漏流气膜冷却有效度。In order to reduce the pollution, the combustor used premixed combustion which changes the temperature profile at the turbine inlet. This will increase the importance of endwall cooling.Meanwhile, to decrease the secondary flow loss, endwall contouring is introduced on NGV endwall.As for cooling, the slot leakage between combustor and NGV is a typical format of endwall cooling.In this work, three typical temperature profiles were abstracted based on real engine conditions to investigate the different influences on endwall cooling both on contoured endwall and flat endwall.The results showed that the change in temperature profile had great effect in the near leading edge region and near pressure side region.; the endwall contouring increased the temperature on the endwall downstream bear the pressure side, and changed the adiabatic effectiveness on slot leakage cooling.

关 键 词：燃烧室温度剖面 非轴对称端壁 缝隙泄漏流冷却 

分 类 号：TK474.7[动力工程及工程热物理—动力机械及工程]