用于冷却塔的混流式水轮机空化特性研究  

A Study of Cavitation Performance of Francis Turbines Applied to Cooling Towers

作　　者：盛立君 郑源[2] 朱飞[1] 韩保雷 

机构地区：[1]河海大学水利水电学院,南京210098 [2]河海大学能源与电气学院,南京210098 [3]国网新源水电有限公司富春江水力发电厂,杭州311504

出　　处：《中国农村水利水电》2014年第11期168-171,179,共5页China Rural Water and Hydropower

基　　金：国家自然科学基金资助项目"大型混流式水轮机尾水管水力振动研究"(51076041)

摘　　要：利用冷却塔出塔富余水头驱动水轮机来代替塔中原有电机,这项技术已经在一些机械式通风冷却塔中得到了应用。由于混流式水轮机设计水头比较高,且在冷却塔环境下,工作介质水的温度比较高,临界汽化压力值也随水温的提高而提高,因此在水轮机运行过程中有可能会出现较为严重的空化现象。以装置于某冷却塔的混流式水轮机为例,运用计算流体动力学方法,预测其在不同水温下,叶片表面压力和气泡的分布情况,并据此提出改善机组性能的可行方法,同时还研究了不同程度的空化现象对于机组能量性能的影响。The technology of exploiting surplus water head in cooling towers to replace original motors with turbines has been applied to some cooling towers .Due to relatively high design water head of Francis turbines and high temperature of working medium ,which leads to higher critical vaporization pressure ,it is highly likely that serious cavitation phenomenon would take place .Based on a certain Francis turbine applied to a cooling tower ,the method of computational fluid dynamics is utilized to predict the blade surface pressure and the distribution of bubbles at different temperatures ,according to which a possible solution to the improvement of turbine performance is proposed .Meanwhile ,the impact of different levels of cavitation on energy performance is also discussed .

关 键 词：冷却塔 混流式水轮机 水温 空化 计算流体动力学 性能预测 

分 类 号：TK733.8[交通运输工程—轮机工程]