长连接管形式对尾水进口压力和涌浪影响研究  

Research on Influence of Long Standpipe Types on Draft Tube Pressure and Surge

作　　者：储善鹏 张健[1] 陈胜[1] 周天驰 CHU Shanpeng;ZHANG Jian;CHEN Sheng;ZHOU Tianchi(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学水利水电学院,江苏南京210098

出　　处：《人民黄河》2018年第7期113-116,156,共5页Yellow River

基　　金：国家自然科学基金资助项目(51379064);中央高校基本科研业务费专项资金资助项目(2016B10814);国家重点研发计划资助项目(2016YFC0401810)

摘　　要：抽水蓄能电站中,根据尾水调压室长连接管管径和阻抗孔孔径是否一致,可将尾水调压室分为两种形式。分别建立了这两种不同长连接管形式的调压室边界条件数学模型。以特征线法为理论基础并结合工程实例,对不同连接管管径和阻抗孔孔径的若干组合方案进行过渡过程的数值模拟,并计算了各组合方案中阻抗孔局部水头损失系数,同时分析不同组合方案中阻抗孔局部水头损失系数的差异及其对尾水进口压力水头和涌浪水位的影响。结果表明:增大连接管管径或者阻抗孔孔径均会增大尾水进口最小压力水头和尾水调压室最高涌浪水位。连接管与阻抗孔直径相等与连接管管径略大于阻抗孔孔径的方案相比,两者尾水进口最小压力水头相差较小,但后者可以更为明显地降低调压室最高涌浪水位,这一结论可以为工程中连接管和阻抗孔直径的选取提供参考。In pumped storage power stations according to whether diameter of the standpipe and the throttled orifice is same or not the tailrace surge chamber can be divided into two types. The mathematical models of boundary conditions in the throttled surge chamber with two different types of long standpipe were established. Based on the method of characteristic and combined with the engineering example, transient process of several combination programs of different diameters of the standpipe and throttled orifice were simulated numerically and head loss coefficient of throttled orifice in combination programs was calculated. And the difference of combination programs’ head loss coefficient and its influence on upsurge and draft tube pressure were analyzed. The results show that increasing the diameter of the standpipe or throttled orifice can make minimum pressure at draft tube inlet and the maximum upsurge rise. The combination program that diameter of the standpipe and the throttled orifice is same compared with the combination program that diameter of the standpipe is slightly larger than that of throttled orifice, the difference of minimum draft tube pressure is small but the latter can more significantly reduce the maximum upsurge. The conclusion can provide references for the selection of diameter of the standpipe and throttled orifice in engineering.

关 键 词：抽水蓄能电站 连接管 阻抗孔 最高涌浪水位 尾水进口最小压力水头 

分 类 号：TV732.5[水利工程—水利水电工程]