汽轮机排汽通道三维数值模拟  

Research on Three Dimensions Numerical Simulation of Steam Tubine Exhaust Passage

作　　者：李慧[1] 乔春珍[1] 王浩[1] 彭晔[1] 苏兰青 LI Hui, QIAO Chunzhen, WANG Hao, PENG Ye, SU Lanqing(North China University of Technology, Beijing 100144, Chin)

机构地区：[1]北方工业大学,北京100144

出　　处：《东北电力技术》2018年第7期59-62,共4页Northeast Electric Power Technology

摘　　要：以某600 MW汽轮机为研究对象,应用Fluent软件对排汽通道复杂的内部结构进行三维数值模拟,通过建立低压加热器、低压抽汽管道、支撑管道、四壁加强筋4个模型,分步模拟其对喉部出口流场的影响。结果表明:当喉部布置低压加热器和低压抽汽管道时,出口平均流速有所降低,由于绕圆柱流动产生的旋涡脱体,使得构件下方形成低速流区,其两侧为高速流区;支撑管道和四壁加强筋会增加流场的复杂性,通过阻断旋涡作用来提高排汽缸的静压恢复能力,降低喉部出口截面流场的不均匀性,总压损增加。Considering 600 MW steam turbine as the research object, it applicates Fluent software to analysis the exhaustchannel of 3D numerical simulation of the complex internal structure. By establishing four models of low-pressure heater, low pressuresteam pipeline, holding up pipeline and reinforced walls, it simulates the influence on the throat of the outlet flow field step by step.The results show that when the throat arranged in the low-pressure heater and low pressure gas pipeline, the exit velocity decreases.Because of the flow around a circular cylinder vortex generated by the members formed body which makes low flow area, the two sidesare high-speed flow area. The supporting pipe and reinforced walls can increase the complexity of the flow field. It improves the staticpressure of the exhaust hood recovery capability by blocking the vortex. It reduces the ununiformity of throat outlet flow and increasestotal pressure loss.

关 键 词：汽轮机 排汽通道 低压加热器 低压抽汽管道 四壁加强筋 支撑管道 

分 类 号：TK261[动力工程及工程热物理—动力机械及工程]