径向轮缘密封预旋盘腔流动换热特性数值研究  

Numerical Investigations of the Flow and Heat Transfer in a Pre-swirl Rotor-Stator Cavity With Rim Radial Seal

作　　者：程舒娴 晏鑫[1] 李志刚[1] 宋立明[1] 李军[1] CHENG Shu-Xian YAN Xin LI Zhi-Gang SONG Li-Ming LI Jun(Institute of Turbomachinery, Xi＇an Jiaotong University, Xi＇an 710049, China)

机构地区：[1]西安交通大学叶轮机械研究所,西安710049

出　　处：《工程热物理学报》2017年第8期1647-1654,共8页Journal of Engineering Thermophysics

摘　　要：本文通过SST湍流模型求解RANS方程组,研究了带径向轮缘密封的预旋盘腔流动换热特性,并采用附加变量法研究径向密封的封严特性。比较了不同冷气量,不同进气预旋比下的盘腔内流动系数、转盘表面努塞尔数和封严效率。结果表明:在中分面处,预旋比随进气预旋比的增大而增大,静压系数沿径向线性增大。主流入侵使转盘壁面绝热温度升高,根据流动状态计算得出的Nu较实际略大。进气预旋提高封严效率。The flow and heat transfer in a pre-swirl rotor-stator cavity with rim radial seal are numerically investigated by RANS equations and SST turbulence model, and the additional passive tracer method is used to simulate the mainstream ingestion phenomenon. The variations of flow coefficient in cavity, the Nusselt number on rotor surface and sealing efficiency with different sealing flow rate or pre-swirl ratio are investigated. The numerical results show that in the split, pre-swirl ratio increases with the increase of the ratio of inlet pre-swirl. Static pressure coefficient along the radial direction increases linearly. On account of the mainstream ingestion which makes adiabatic temperature on rotor rise, The nusselt number calculated by the flow state is slightly larger than the actual. Inlet pre-swirl is beneficial to sealing efficiency.

关 键 词：涡轮 轮缘密封 预旋进气 数值模拟 

分 类 号：TK474.7[动力工程及工程热物理—动力机械及工程]