多喷嘴冲击式水轮机内部流动及部件振形的研究  

Research of the Internal Flow and Part's Vibration of Multi-nozzle Pelton Turbine

作　　者：宋文武[1] 符杰[1] 周敏 姚文革 杨佐卫[3] 

机构地区：[1]西华大学能源与环境学院,成都610039 [2]昆明电机厂有限公司,昆明650100 [3]四川大学制造科学与工程学院,成都610065

出　　处：《大电机技术》2008年第6期41-45,共5页Large Electric Machine and Hydraulic Turbine

基　　金：四川省教育厅重点项目资助(2006A089);昆明电机厂有限公司委托项目(07204042)

摘　　要：为了提高冲击式水轮机的出力与比转速,在设计时往往采取增加喷嘴数,但喷嘴数的增加会引起转轮内部流动的相互干涉,降低机组效率。本文采用CFD技术对多喷嘴冲击式水轮机的转轮内部流动进行数值模拟,通过水斗与喷嘴之间的相互流动计算的结果,优化出转轮水斗数,使之与喷嘴数相匹配,得到了单个水斗接受射流的全过程的速度-压力分布以及水流迹线、多个喷嘴同时作用时转轮内部流动的干涉情况。并利用ANSYS软件对水斗进行了应力分析,确定了水斗的应力分布、最高应力值点以及水轮机转轮和喷嘴的自振频率和振形图。本文的研究为大容量、多喷嘴冲击式水轮机转轮流动分析以及水斗的强度设计和喷嘴的振动研究提供了依据,同时也为电站的实际运行提供了参考。In order to increase the force and specific speed of Pelton turbine, the multi-nozzle configuration is commonly adopted. However, the addition of nozzles will lead to the jet interference, which reduces the efficiency of Pelton turbines. In this paper, numerical simulation is made for the internal flow of the multi-nozzle Pelton turbine by CFD, bucket number is worked out by the flow calculation results of the bucket and nozzle so that it matches with the number of the nozzles. As a result, velocity-pressure distribution and current path line of the jet whole process of each bucket is obtained. Stress analysis is carried out for the bucket by means of ANSYS software, thus, the bucket＇s stress distribution, maximum stress value point and oscillation about the runner and nozzle is confirmed. The work done in this paper provides for the runner＇s flow analysis, bucket＇s strength design and oscillation research of powerful Pelton turbine with multi-nozzle. Meanwhile, reference for power plant＇s real operation is supplied.

关 键 词：冲式击水轮机 多喷嘴 内部流动 数值模拟 振动 

分 类 号：TK730.2[交通运输工程—轮机工程]