1000 MW水轮机转轮径向安装偏差对流动特征的影响  

Influence of radial installation deviation on flow characteristics of 1000 MW hydro turbine runner

作　　者：吴思源 王一凡 刘兴民 黄星星 杜清玭 周凌九[2,4] 陈端 王正伟 WU Siyuan;WANG Yifan;LIU Xingmin;HUANG Xingxing;DU Qingpin;ZHOU Lingjiu;CHEN Duan;WANG Zhengwei(China Three Gorges Construction Engineering Corporation,Ningnan 615400,China;College of Water Resources and Civil Engineering,China Agricultural University,Beijing 100083,China;S.C.I.Energy,Future Energy Research Institute,Seidengasse 17,8706 Zurich,Switzerland;Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System,Beijing 100083,China;Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China;State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]中国三峡建工(集团)有限公司,四川宁南615400 [2]中国农业大学水利与土木工程学院,北京100083 [3]瑞华智慧能源有限公司,瑞士苏黎世8706 [4]北京市供水管网系统安全与节能工程技术中心,北京100083 [5]清华大学能源与动力工程系,北京100084 [6]清华大学水圈科学与水利工程全国重点实验室,北京100084

出　　处：《水力发电学报》2024年第5期35-42,共8页Journal of Hydroelectric Engineering

基　　金：三峡建设公司(JGJD0322003)。

摘　　要：本文以百万千瓦混流机组为研究对象,使用ANSYS软件进行三维全流道稳态数值分析。探究在额定工况下,当转轮出现Y轴负方向0.1 mm、0.3 mm、0.5 mm、1.5 mm、2.5 mm的径向安装偏差时,间隙分布不均匀对于百万千瓦大型水轮机组内部流动特征的影响。研究发现,在一定偏差数值内,随着间隙的减小,该区域压力逐渐上升,但超过该数值以后,流体无法流入则变为了低压区。另外,上冠腔和下环腔均出现了相同数量的旋涡演变周期,但旋涡的发生位置不同,上冠腔旋涡较剧烈,且数量与叶片数呈非整数倍关系。最后阐明了下环腔内壁面受到的旋涡流动冲击程度要大于上冠腔内壁面。因此,本研究可以应用于其他大中型混流式水轮机的设计与安装,对于提高水轮机运行质量、降低运行成本和提高水电站效益具有重要意义。Focused on a 1000 MW huge-capacity hydraulic turbine unit,this paper conducted three-dimensional steady internal flow numerical simulation using commercial code ANSYS.The impact of uneven clearance distribution on its internal flow characteristics of the turbine under the design operating point was investigated,considering radial installation deviations of 0.1 mm,0.3 mm,0.5 mm,1.5 mm,and 2.5 mm on the negative y-direction.The results revealed that within a certain range of deviation,the pressure in the corresponding region gradually rises with the decrease in clearance.However,once the deviation exceeded a certain threshold,water was unable to flow in,thus resulting in the formation of a low-pressure area.Furthermore,both the upper crown chamber and the bottom ring chamber exhibited an equal number of vortex evolving cycles with different vortex intensity,and the vortex was more intense in the upper crown chamber;The number of vortices is not an integer multiple of the blade number.Finally,we clarify that the vortex flow impact was greater on the inner wall of the bottom ring chamber than that of the upper crown chamber.This study is applicable to the design and installation of other large or medium size Francis turbines for improving their operational quality,reducing operating costs,and enhancing the overall efficiency of hydropower plants.

关 键 词：百万千瓦转轮 混流式机组 径向安装偏差 流动特征 计算流体力学 

分 类 号：TV513[水利工程—水利水电工程]