600MW空冷汽轮机组低压排汽缸流场模拟和结构优化  

Numerical Simulation and Structure Optimization of the Low-pressure Exhaust Hood of an Air Cooling Steam Turbine

作　　者：刘艳[1] 李宇峰[2] 冀春俊[1] 

机构地区：[1]大连理工大学能源与动力学院,大连116024 [2]哈尔滨汽轮机厂有限责任公司,哈尔滨150046

出　　处：《汽轮机技术》2010年第5期329-332,共4页Turbine Technology

摘　　要：采用雷诺平均的NS方程和标准的k-ε湍流模型对某空冷汽轮机低压排汽缸进行数值模拟。计算结果显示设计工况下该排汽缸中扩压器出口附近流动发生了分离,导致排汽缸的气动性能不理想。为了改善扩压通道的流场进而提高其气动性能,对扩压器结构进行了优化。优化后的扩压器出口的静压恢复系数比原结构提高了46.5%,总压损失系数分别降低了20.4%。对于排汽缸,其出口的静压恢复系数提高了137.7%,总压损失系数降低了30.6%。由此说明优化后的排汽缸具有较好的气动性能。Numerical simulation of the low pressure exhaust hood of an air cooling steam turbine is carried out in this paper by using the reynolds averaged NS equation and standard k-ε model. Simulation results show that flow separation occurs near the outlet of the diffuser under the design condition. This leads to poor aerodynamic performance of the exhaust hood. The ＂paper has made optimization for the diffuser to improve flow field of it. Compared to corresponding data of the previous structure ,the static pressure recovery coefficient of the optimized diffuser increases 46： 5% and the total pressure loss coefficient decreases 20.4%. For the exhaust hood, the static pressure recovery coefficient increases 137.7% and total pressure loss coefficient reduces 30.6%. These show that the aerodynamic performance of the new hood has been improved.

关 键 词：低压排汽缸 湿蒸汽 湍流模拟 结构优化 

分 类 号：TK262[动力工程及工程热物理—动力机械及工程]