某新型高效冷凝发电汽轮机排汽缸气动性能研究与结构优化  

Numerical Simulation on Aerodynamic Performance and Structure Optimization of LowPressure Exhaust Hood for A New High Efficiency Condensing Steam Turbine

作　　者：张超[1] 陆晋[1] 李宏福[1] 鲁桂明 ZHANG Chao;LU Jin;LI Hong-fu;LU Gui-ming(Industrial Turbine Academy Turbo mechanical Institute,Hangzhou Steam Turbine Company Limited,Hangzhou 310022,China)

机构地区：[1]杭州汽轮机股份有限公司工业透平研究院,杭州310022

出　　处：《汽轮机技术》2020年第1期23-26,共4页Turbine Technology

基　　金：杭州汽轮机股份有限公司资助项目(C新17-08)。

摘　　要：采用雷诺时均处理的N-S方程和标准k-ε湍流模型,将某新型高效冷凝发电汽轮机低压排汽缸与末级叶栅进行了联合仿真数值模拟研究。计算结果表明:排汽缸中存在以分离涡和通道涡占主导地位的漩涡流,导致气动性能不佳;为了改善扩压能力进而提高其气动性能,采取调整内外导流环扩张角度以及轴向长度等措施对扩压器进行了结构优化,优化后排汽缸出口静压恢复系数从-0.137提升到了0.1617,总压损失系数降低了近18.5%,整机效率提升了近0.5%。A combined numerical simulation,which couples the low pressure exhaust hood with the last stage blade of a new high efficiency condensing steam turbine,is carried out in this paper by using the Reynolds averaged N-S equations and standard k-εturbulence model.Simulation results show that the complicated vortex flow,which mainly including passage vortex and separation vortex,leads to poor aerodynamic performance of the exhaust hood.And some measures,such as modifying the expansion angle and the axial length of the guide ring,has been taken to improving the aerodynamic performance of low pressure exhaust hood.For the optimized exhaust hood,the static pressure recovery coefficient increased from-0.137 to 0.1617,total pressure loss coefficient reduced nearly 18.5%,and the efficiency of the steam turbine increased nearly 0.5%.

关 键 词：低压排汽缸 联合仿真 气动性能 结构优化 

分 类 号：TK263.[动力工程及工程热物理—动力机械及工程]