摘要
本文通过数值模拟的方法,研究了在不同吹风比条件下透平叶片压力面和吸力面气膜冷却对叶栅气动损失的影响,采用损失分离方法,分析了各部分损失的变化规律。结果表明,气膜冷却引起的损失与冷气射流与主流的动能比成正比;孔内损失随吹风比迅速增加,高吹风比下不可忽略;低速条件下温差传热不可逆损失是气膜冷却不可逆损失的主要来源;气膜冷却有可能减小边界层内的损失。
Film cooling on vane pressure surface and suction surface were simulated by means of CFD. The influence of blowing ratio on aerodynamic loss was studied, using the loss separation method. Analysis results showed that the aerodynamic loss caused by film cooling was in linear relation with the kinetic energy ratio; at higher BR, the loss generated in the cooling hole became more important and was not negligible;the irreversible loss caused by heat transfer between different temperatureswas the main loss causation at low speed situation; film cooling may reduce the boundary layer loss.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2016年第8期1627-1634,共8页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51336007)
关键词
叶栅
气膜冷却
气动损失
熵产率
数值计算
vane cascade
film cooling
aerodynamic loss
entropy creation
numerical simulation
