摘要
利用计算流体软件基于Spalart-Allmaras单方程模型分别对600MW机组的排汽缸、凝汽器喉部和两者耦合的排汽通道进行三维数值模拟,以便更加清晰地了解排汽通道的整体流场,并对排汽通道进行合理优化改造。计算结果表明,单独结构模拟结果与排汽通道耦合模拟的结果存在很大差异,主要体现在流场和压力损失上。在有进口漩流的模型中,蒸汽流场分布不对称,因此,不能为简化而采用1/2模型进行研究。针对排汽通道内流场分布,在排汽缸拱顶处加装导流挡板和在扩压管处加装分流板,能有效改善通道内的流场。
Models of exhaust hood, condenser throat and that one coupled with both in 600MW unit were simulated by fluid numerical simulation software based on the single equation model of Spalart-Allmaras, so that learning about the integral flow field in the exhaust passage more clearly and optimize the structure . Simulation results show that there are differences between single model and exhaust passage model coupled with exhaust hood and condenser throat, which reflect mainly on flow field and pressure drop. In the model which considers the inlet swirl on the flow, the flow field is not uniform symmetrical. Therefore, the coupled model must be a complete structure but not an half for the simplification. According to the flow flied in the exhaust passage, the installations of guide baffles on the top wall of exhaust hood and spreader plates in the diffuser improve the flow field effectively.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2014年第14期2267-2273,共7页
Proceedings of the CSEE
关键词
汽轮机
排汽缸
凝汽器喉部
耦合流动
数值模
拟
结构优化
steam turbine
exhaust hood
condenser throat
coupled flow
numerical simulation
structure optimization
