C型叶片转轮水泵水轮机驼峰区流动特性分析  

Analysis of flow characteristics in hump regions of pump turbine with C-type runner blades

作　　者：肖业祥[1,2] 肖微 任绍成[4] 桂中华 林昊 XIAO Yexiang;XIAO Wei;REN Shaocheng;GUI Zhonghua;LIN Hao(State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China;Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China;Pumped-storage Technological&Economic Research Institute State Grid Xinyuan Company LTD,Beijing 100761,China;China Institute of Water Resources and Hydropower Research,Beijing 100048,China)

机构地区：[1]清华大学水圈科学与水利工程全国重点实验室,北京100084 [2]清华大学能源与动力工程系,北京100084 [3]国网新源控股有限公司抽水蓄能技术经济研究院,北京100761 [4]中国水利水电科学研究院,北京100048

出　　处：《水力发电学报》2024年第12期89-97,共9页Journal of Hydroelectric Engineering

基　　金：国家电网有限公司总部管理科技项目资助(5419-202243054A-1-1-ZN)。

摘　　要：为探究转轮叶型对水泵水轮机驼峰区流动的改善程度和影响规律,本文对模型水泵水轮机进行了预测和试验分析,然后对转轮采用C型叶片优化后的水泵水轮机性能进行预测分析,基于涡识别法讨论了转轮改型前后各过流部件在驼峰区的流动和涡旋流分布情况,揭示了优化转轮叶型对驼峰区流动的影响。研究发现,改型后水泵水轮机的驼峰范围和驼峰裕度更小,扬程随流量变化趋势更平缓。在大流量工况下,尾水管、导叶、转轮域内与优化前相比涡旋面积更小。在驼峰区工况下,尾水管出口处有来自转轮的小部分回流,但与优化前相比回流明显减少;导叶及转轮域内与优化前相比发生流动分离的区域也有所减少,在无叶区内的涡旋较优化前明显减少,说明优化转轮叶型有助于改善泵工况的驼峰特性及其内流特性。This study conducts numerical simulations and experimental tests of a model pump turbine to explore the improvement and influence of an optimized runner blade profile on the flows in a reversible pump turbine working in the hump region.A simulation analysis on its performance is made for the optimized C-type profile.Based on the vortex identification method,we discuss the flow and vortex distributions in each section of its flow passage in the hump region before and after runner modification,and reveal the influence of the new profile on the flows in the hump region.We find that after optimization,the hump range and hump margin of the pump turbine are smaller,and the trend of its head variations with flow rate is milder.And,the vortex zones become smaller in its draft tube,guide vane section,and runner section under a large flow rate.Compared with the model before optimization,the backflow is significantly reduced,and only a small amount of backflow comes from the rotating runner at the draft tube outlet under the hump region conditions.The zones of flow separation in the guide vane and runner sections are reduced,and the vortices in the vaneless region are significantly reduced,indicating the runner blade profile optimization helps improve the hump characteristics and internal flow characteristics of the pump.

关 键 词：可逆式水泵水轮机 转轮优化设计 驼峰特性 涡识别法 流动特性 

分 类 号：TK734[交通运输工程—轮机工程]