基于流固耦合的混流式水轮机转轮裂纹改造分析  

Analysis of Runner Crack Retrofit of Francis Turbine Based on Fluid-Solid Coupling

作　　者：刘阳 潘利坦 孟鹏 韦正鹏 LIU Yang;PAN Li-tan;MENG Peng;WEI Zheng-peng(Huadian Electric Power Research Institute Co.,Ltd.,Hangzhou 310030,China)

机构地区：[1]华电电力科学研究院有限公司,浙江杭州310030

出　　处：《水电能源科学》2021年第1期151-154,163,共5页Water Resources and Power

基　　金：华电集团2018年科技项目。

摘　　要：为了解光照电厂转轮裂纹的改造效果,借助ANSYS有限元计算平台,利用流固耦合方法分析转轮改造前后在不同水头、负荷下的流场及动、静应力。计算结果表明,转轮在叶片出口边中部有较大变形,应力集中点在叶片出口边靠近上冠与下环处,与现场发现的裂纹位置相同,说明应力集中是裂纹出现的原因之一。转轮上冠、下环与叶片出水边连接处加装三角块对转轮的水力性能影响可忽略;而转轮最大应力降幅均超过20%,最大应力位置从连接处转移至三角块处,可有效改善转轮裂纹情况。In order to find out the effect of runner crack modification in Gangzhao power plant,the flow field,dynamic and static stresses of runner before and after modification under different water heads and loads were analyzed by means of fluid-solid coupling method with ANSYS finite element calculation platform.The calculation results show that the runner has large deformation in the middle of the outlet edge of the blade,and the stress concentration point is close to the upper crown and the lower ring at the outlet edge of the blade,which is the same position as the crack found in the field,indicating that the stress concentration is one of the reasons for the cracks.The hydraulic performance of the runner can be neglected if the triangle block is installed at the connection between the upper crown and lower ring of the runner and the outlet edge of the blade,while the maximum stress drop of the runner is more than 20%,and the maximum stress position is transferred from the connection to the triangle block,which can effectively improve the crack condition of the runner.

关 键 词：混流式水轮机 流固耦合 转轮裂纹 三角块 静应力 

分 类 号：TK733[交通运输工程—轮机工程]