耦合末级叶片的汽轮机排汽缸气动数值模拟  

Numerical Simulation on Aerodynamic Performance of Steam Turbine Exhaust Hood Coupling Last Stage Blade

作　　者：史立群 杨建道 杨锐 彭泽瑛 

机构地区：[1]上海电气电站设备有限公司,上海201108

出　　处：《动力工程学报》2011年第9期655-658,共4页Journal of Chinese Society of Power Engineering

摘　　要：为研究末级叶片出口流场径向的不均匀性对排汽缸气动性能的影响,基于稳态的三维N-S方程、能量方程以及连续性方程,采用商业CFD软件进行了排汽缸气动性能的数值模拟计算.结果表明:耦合末级叶片的数值模拟计算结果更接近真实值;动叶叶顶漏气射流对排汽缸内的流动结构有很大影响,使得计算得出的静压恢复系数有所增加;叶片叶顶漏气影响不可忽略,在今后的排汽缸气动设计及优化工作中需要考虑末级叶片的影响;排汽缸进口条件对于其气动性能有着决定性的影响.In order to study the influence of flow field non--uniformity at last blade exit of steam turbine on aerodynamic performance of its exhaust hood, a numerical simulation has been carried to analyze the aerodynamic performance based on 3D steady-state N-S and energy and continuity equations using commercial CFD software. Results show that the numerical simulation coupling last stage blade works out a result closer to the true value; the leakage jet at blade tip has a significant impact on flow field in the exhaust hood, which generally results in increased recovery coefficient of calculated static pressure; the effect of tip leakage cafft be neglected in future design and optimization concerning aerodynamic performance of the exhaust hood; the inlet condition of exhaust hood affects the aerodynamic performance decisively.

关 键 词：汽轮机排汽缸 气动性能 叶片耦合 叶顶间隙 叶顶漏气 

分 类 号：TK229.2[动力工程及工程热物理—动力机械及工程]