摘要
为了研究轴流透平与非轴对称排汽系统流场间的相互作用,对带有单级透平的300/600 MW汽轮机排汽系统模型内流场进了模型实验,并用商用软件CFX数值计算了实验工况下带有全周叶栅通道的单级透平与排汽系统内的耦合流场.对比实验与数值模拟结果,二者吻合较好.通过对实验和数值结果分析发现,排汽系统内的非轴对称流场使透平叶栅通道内流动沿周向发生变化,扩压器内出现大的流动分离,排汽系统内总压损失增大,静压恢复系数为负.
This paper describes experimental and numerical studies on the flow field in a coupled turbine stage and exhaust hood model. The low subsonic stage with 22 stator blades and 30 rotor blades is especially designed for the hood model, which is a typical design for 300/600 MW steam turbine. The flow details in the exhaust system with the whole annulus stator and rotor blade rows are simulated by employing CFX. Good agreements between numerical and experimental results are demonstrated. It is found that the swirl angle profile and total pressure profile caused by upstream turbine stage at the diffuser inlet have an unfavorable effect on the exhaust hood performance.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2008年第4期567-572,共6页
Journal of Engineering Thermophysics
基金
国家自然科学基金重点项目(No．50336050)
