水泵水轮机流动CFD模拟的研究进展  

Advances in CFD flow simulations for pump-turbine

作　　者：尹俊连[1] 王德忠[1] 王乐勤[2] 魏显著 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240 [2]浙江大学化工机械研究所,杭州310027 [3]水力发电设备企业国家重点实验室,哈尔滨150040

出　　处：《水力发电学报》2013年第6期233-238,243,共7页Journal of Hydroelectric Engineering

基　　金：国家重点基础研究发展计划资助(2009CB724302);国家自然科学基金面上项目(50979095)

摘　　要：简要介绍水泵水轮机数值模拟实践中三个主要流动预测问题(性能预测、压力脉动预测、过渡过程模拟)的特点,首先对驼峰曲线和"S"特性曲线预测采用湍流模型以及计算结果进行了分析和阐述;在压力脉动预测的数值模拟中,重点对时间步长和网格尺度的选择进行了说明,并强调了水可压缩性对非定常计算的重要性;最后对过渡过程计算中出现的两种计算变转速问题方法进行了概述,并简单介绍了基于一维和三维耦合的过渡过程计算新方法。This paper discusses three issues （performance prediction, pressure fluctuation, transient process simulation） involved in CFD simulation. First, how to select a turbulence model for prediction of the performance curves and the related numerical results are examined and discussed. For the second issue, the roles of time step and grid size in unsteady simulations are addressed, and an emphasis is put on the effects of compressibility of water. Finally, two typical methods for calculation of flow transients under varying rotation speed are demonstrated, and a new model based on the coupling of 3D CFD and 1D water hammer equations is presented.

关 键 词：水力机械 水泵水轮机 性能预测 压力脉动 数值模拟 过渡过程 

分 类 号：TK730.2[交通运输工程—轮机工程]