调压室非对称孔口阻抗特性的数值模拟  

Numerical simulation on impedance characteristics of asymmetry orifice in a differential surge chamber

作　　者：李向宾[1] 侯靖[2] 吴旭敏[2] 李新新[3] 

机构地区：[1]华北电力大学核科学与工程学院,北京102206 [2]华东勘测设计研究院,浙江杭州310014 [3]华北电力大学可再生能源学院,北京102206

出　　处：《华北电力大学学报（自然科学版）》2011年第4期91-95,共5页Journal of North China Electric Power University：Natural Science Edition

基　　金：中央高校基本科研业务费项目(09QG12)

摘　　要：保证差动式调压室良好的水力特性,对于水电站的安全稳定运行具有重要意义。以某水电站上游调压室为研究对象,对其大井与升管之间的回流孔采用非对称结构设计,利用专业软件详细计算了其进出流阻抗特性。结果表明:与对称孔口情况相比,非对称回流孔的进流阻抗系数明显减小,而出流阻抗系数显著增大,从而大大改善了调压室的动态特性;在分流比固定的情况下,进出流阻抗系数基本保持不变,而且与流量变化基本无关;在分流比变化的情况下,进(出)流阻抗系数随分流比的增大而呈指数函数形式单调减小(增大)。For safeguarding smooth running of the hydropower station, it＇s very important to keep better hydraulic performanee of the differential surge chamber. Based on the upstream surge chamber of a hydropower plant, both the entering impedance characteristics and the discharging one of an asymmetry backflow orifice were obtained with numerical simulation. The results show that comparing to that of the symmetry orifice, the entering impedance coefficient with asymmetry orifice lowers apparently, while the discharging one increases dramatically, thus improving the dynamic characteristics of the surge chamber; As the flux ratio fixes, both the entering impedance coefficient and the discharging one keep unchanged with the flux varies ; As the flux ratio increases （ or decreases） , the entering （ or discharging ） impedance coefficient lowers （or increases ） monotonically with an exponential function curve.

关 键 词：差动式调压室 非对称孔口 水力阻抗 数值模拟 

分 类 号：TV732.54[水利工程—水利水电工程]