尾水管内水流流动的近似计算  

Approximate Calculation of Flow Fields in Hydraulic Turbine Draft Tube

作　　者：于泳强[1] 罗兴锜[1] 郭鹏程[1] 

机构地区：[1]西安理工大学水利水电学院,陕西西安710048

出　　处：《水电能源科学》2005年第6期54-57,共4页Water Resources and Power

基　　金：国家自然科学基金资助项目(90410019);教育部高等学校博士点专项资助项目(20040700009);陕西省教育厅专项科研计划项目(05JK264)

摘　　要：近似计算了尾水管进口处水流环量,导出了压力脉动的振动频率和振幅的近似计算公式,对由尾水管中涡带引起的压力脉动特性进行了分析,并近似推导了尾水管中压力脉动特性的计算公式。实例计算表明,该方法简便易行,同时对压力脉动特性进行理论分析和指导水轮机运行有一定的实用价值。When water turbine works under part-load conditions,severe oscillations always happen in the draft tube simultaneously.This oscillation is mainly generated by the pressure fluctuation caused by the draft tube vortex.It is quite obvious that it is very important to study the characteristics of pressure fluctuation in the draft tube,it is also essential to study de-oscillation of hydraulic unit and the safety in operation.This paper presents the deduction of oscillation frequency and amplitude equations by simplifying draft tube flow and calculating the circulation at the intake of draft tube.

关 键 词：尾水管 压力脉动 水流环量 振动频率 

分 类 号：TV134[水利工程—水力学及河流动力学]