基于熵产理论的混流式水轮机小开度水力损失特性分析  

Analysis of Hydraulic Loss Characteristics of Francis Turbine Based on Entropy Production Theory

作　　者：刘昆庭 刘海洋[1] 曲力涛 刘殿程 迟福东 阚阚 周大庆[1] LIU Kun-ting;LIU Hai-yang;QU Li-tao;LIU Dian-cheng;CHI Fu-dong;KAN Kan;ZHOU Da-qing(School of Electrical and Power Engineering,Hohai University,Nanjing 211100,China;Huaneng Lancang River Hydropower Co.,Ltd.,Kunming 650214,China)

机构地区：[1]河海大学电气与动力工程学院,江苏南京211100 [2]华能澜沧江水电股份有限公司,云南昆明650214

出　　处：《水电能源科学》2024年第12期157-161,共5页Water Resources and Power

基　　金：国家重点研发计划(2022YFC3005401);云南省技术创新人才培养对象项目(202205AD160019);中国华能集团有限公司科技项目(HNKJ22-HF92)。

摘　　要：为探究水轮机空载工况内部复杂流动及其诱导水力损失特征,采用雷诺时均方法对某大型混流式水轮机在额定水头空载及附近工况进行了数值模拟,基于熵产理论对核心过流部件的不同类型的水力损失进行了定量分析,通过定义流线坐标系对转轮内部损失分布进行定量研究,明确了空载工况下水力损失的分布特点和产生原因。结果表明,活动导叶、转轮及尾水管的水力损失占主导地位,无叶区的大尺度涡结构、转轮压力面的回流现象及尾水管直锥段的高流速旋涡是引起间接耗散增加的主要原因。To investigate the internal complex flow and induced hydraulic loss characteristics of hydraulic turbine under no-load conditions,the Reynolds time-average method was used to numerically simulate the no-load and nearby working conditions of a large Francis turbine at the rated head.The different types of hydraulic losses of the core flow passage components were quantitatively analyzed based on the entropy production theory.By defining the streamline coordinate system,the distribution of internal losses in the runner was quantitatively studied,and the distribution characteristics and causes of hydraulic losses under no-load conditions were clarified.The results show that the hydraulic loss of the movable guide vanes,runner and draft tube is dominant,and the large-scale eddy structure in the bladeless zone,the reflux phenomenon of the pressure surface of the runner and the high flow velocity vortex of the straight cone section of the draft tube are the main reasons for the increase of indirect dissipation.

关 键 词：水轮机 数值模拟 熵产理论 空载工况 水力损失 

分 类 号：TV734.1[水利工程—水利水电工程] TK734[交通运输工程—轮机工程]