双机共尾水溢流式调压室过渡过程研究  

Study on transition process of tailrace overflow surge chamber shared by two units

作　　者：刘甲春[1] 张健[1] 俞晓东[1] 

机构地区：[1]河海大学水利水电学院,江苏南京210098

出　　处：《人民长江》2016年第10期72-75,95,共5页Yangtze River

基　　金：国家自然科学基金项目项目(1379064)

摘　　要：由于地形、地质以及运行时的流态等原因,近期一些尾水调压室在设计时采用了室后交汇布置的形式,这种布置形式是将其底部孔口和各支管相连,因此致使在稳定运行状态下,出现了一些新的水力学问题。以一维刚性水锤及弹性水锤的特征线方法为理论基础,结合某电站工程实例,对双机共尾水溢流式调压室进行了数值模拟。结果表明,在稳定运行时,调压室两阻抗孔均存在进出流量,其值的大小与各支管流量和尾水支洞水头损失系数有关,即与支管内水头损失有关;调压室涌浪以及溢流量随着阻抗孔口及溢流堰宽度的增加而增大。Due to the topography,geological condition and operational pattern,some recent tailrace surge chamber adopts the layout of intersection behind the room,with branch pipes connected at the bottom of chamber. Under this new layout,some new hydraulic problems appear when the units are in stable operation. Taking the method of characteristics（ MOC） of one- dimensional rigid water hammer and elastic water hammer as the theoretical basis,we carried out numerical simulation to the tailrace overflow surge chamber shared by two units. The results show that the two impedance holes of the chamber have inward and outward flow under stable operation case,and the flow volume is related with flow in each branch pipe and head loss of each tailrace branches. The surge amplitude in the chamber and the overflow volume increase with the augment of impedance hole size and width of overflow weir.

关 键 词：溢流量 特征线 阻抗孔 溢流式调压室 

分 类 号：TV732[水利工程—水利水电工程]