尾水管脉动压力及扩散方式的研究  

Study on pressure fluctuations in draft tube and its diffuser

作　　者：郑双凌[1] 马吉明[1] 陈长植[1] 

机构地区：[1]清华大学,北京100084

出　　处：《水力发电》2003年第7期28-31,共4页Water Power

摘　　要：许多研究成果表明 ,影响水轮机水力稳定性有多种因素 ,其中一个重要因素是尾水管内水流的压力脉动。由于各种原因产生的高频和低频的压力脉动会使尾水管内部产生严重的空蚀破坏或者诱发水轮机叶片产生振动等问题。为此 ,结合广西百色水利枢纽工程尾水系统进行了水力学试验 ,量测了尾水管的脉动压力 ,得出不同工况下尾水管的水流特性。对于作为水轮机能量恢复装置的尾水管 。Many study results showed that pressure fluctu ation in draft tubes is one of the most important factors that affects the stability of turbines. Pressure fluctuations with high or low frequency can lead to acute cavitation damage in draft tubes or vibration of the vane of turbine. This paper studies the flow characteristics in draft tubes through hydraulics experiment. Furthermore two different designs of draft tube are compared and analyzed.

关 键 词：尾水管 脉动压力 扩散方式 空蚀 水轮机 主频率 

分 类 号：TV136.1[水利工程—水力学及河流动力学]