汽轮机凝汽器喉部与排汽缸耦合流动的数值模拟  

Numerical Simulation of Condenser Throat Coupling with the Exhaust Hood in Steam Turbine

作　　者：曹丽华[1] 刘佳[1] 陈洋[1] 李勇[1] 孟芳群 周云龙[1] 

机构地区：[1]东北电力大学,吉林132012 [2]张家口发电厂,张家口075131

出　　处：《汽轮机技术》2011年第2期92-94,共3页Turbine Technology

基　　金：吉林市科技发展计划资助项目(201030003)

摘　　要：为了更加透彻的认识凝汽器喉部的流动状况,通过求解由k-ε双方程湍流模型封闭的三维时均N-S方程,对凝汽器喉部和排汽缸的耦合流动进行了数值模拟。结果表明:凝汽器喉部和排汽缸耦合计算的结果,完全不同于凝汽器喉部单独计算的结果,喉部出口的速度分布和喉部的能量损失系数都差异很大。喉部流场受入口来流的影响较大。采用耦合计算,能够获得更加接近实际的数值结果,为凝汽器喉部的优化设计、改造和性能研究奠定了基础。In order to obtain more accurate and detailed information of the three dimensional flow in condenser throat, a combined numerical model, which couples the condenser throat with the exhaust hood, was introduced in this paper. The Reynolds averaged N - S equations with k - ε turbulence model was adopted to analyze the flow field in the condenser throat. The results indicate that coupling calculation result of combined model is widely different from the single calculation result of condenser throat, both in the velocity distribution and in the coefficient of energy loss. The flow field of condenser throat is strongly influenced by the incoming flow of inlet. The presented combined model can give more accurate numerical results than the previous single model. The study provides a more reasonable foundation for the optimal design, reorganization and performance study of condenser throat in steam turbine.

关 键 词：凝汽器喉部 排汽缸 数值模拟 耦合计算 

分 类 号：TK263.5[动力工程及工程热物理—动力机械及工程]