端壁通道间隙对端壁泄漏流冷却的影响  

Effects of Mid-Passage Gap on Endwall Purge Flow Film Cooling

作　　者：杨星[1] 刘钊[1] 刘战胜[1] 丰镇平[1] 

机构地区：[1]西安交通大学能源与动力工程学院叶轮机械研究所,西安710049

出　　处：《工程热物理学报》2017年第1期44-48,共5页Journal of Engineering Thermophysics

基　　金：国家自然科学基金重点项目资助(No.51336007);高等学校博士学科点专项科研基金资助(No.20130201120060)

摘　　要：本文针对叶栅通道中端壁间隙的影响进行数值研究,详细分析了有无端壁间隙、不同间隙泄漏流流量和不同间隙射流角情况下端壁表面泄漏流气膜冷却有效度的分布特性。结果表明:端壁间隙会在一定程度上限制端壁表面冷却气膜的扩散分布,主要影响区域为端壁吸力面侧及喉部下游;不恰当的端壁间隙泄漏流会削弱端壁某些局部区域的泄漏流冷却效果;端壁间隙射流角对端壁表面泄漏流冷却效果的作用总体上非常有限,其主要改变某些局部区域的气膜冷却分布。Numerical Simulations were performed to study the effects of mid-passage gap on endwall purge flow film cooling.Film cooling performance from upstream slot purge flow with and without mid-passage gap was examined in detail.The effects of mass flow ratio and jet angle of purge flow from the mid-passage gap were studied.Results show that the mid-passage gap could restrict the spreading of the upstream purge flow over the endwall surfaces.The mid-passage gap significantly affected cooling coverage near the suction side and the downstream region of the endwall passage.In addition,the purge flow from the mid-passage gap could reduce the purge flow cooling performance on the endwall when the mid-passage purge flow was improperly applied.The effects of the jet angle of the mid-passage gap on endwall purge flow cooling were limited,which could only alter the film cooling distributions slightly in some local areas on the endwall.

关 键 词：燃气涡轮端壁 泄漏流 通道间隙 气膜冷却 数值分析 

分 类 号：TK472[动力工程及工程热物理—动力机械及工程]