含长连接管的调压室流量系数改进研究  

Investigation on Improvement of Flow Coefficient of Surge Tank with Long Connecting Pipe

作　　者：徐敏杰 陈胜[1] 蔡朝 杨森 胡超[1] 陈乾原 XU Min-jie;CHEN Sheng;CAI Chao;YANG Sen;HU Chao;CHEN Qian-yuan(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;Water Engineering Quality and Safety Supervision Station of Kunshan,Suzhou 215300,China;PowerChina Huadong Engineering Corporation Limited,Hangzhou 311122,China)

机构地区：[1]河海大学水利水电学院,江苏南京210098 [2]昆山市水务工程质量与安全监督站,江苏苏州215300 [3]中国电建集团华东勘测设计研究院有限公司,浙江杭州311122

出　　处：《水电能源科学》2022年第10期123-126,共4页Water Resources and Power

基　　金：国家自然科学基金项目(51879087);中央高校基本科研业务费专项资金资助(B210202015)。

摘　　要：在水力过渡过程计算中,通常将含长连接管的调压室简化成常规阻抗式调压室,但当连接管长度较长时,常规阻抗式模型无法精确预测其涌波水位。因此,分析含长连接管调压室的水力特性及其与常规阻抗式调压室的流量系数差异,在阻抗式调压室模型基础上提出了改进流量系数的预测模型,并与真实的含长连接管调压室模型计算结果进行了对比,开展了连接管尺寸的敏感性研究。结果表明,采用常规阻抗式调压室模型模拟含长连接管调压室涌波水位极值时,因流入流量系数取值偏小(一般为0.6)、流出流量系数偏大(一般为0.8),涌浪极值均偏小;改进后的流量系数可计入长连接管的影响,基于阻抗式调压室改进流量系数模型能准确预测含长连接管调压室涌波水位极值。In the calculation of the hydraulic transition process, the surge tank with long connecting pipes is usually simplified as a conventional impedance surge chamber, but when the length of the connecting pipe is long, the conventional throttled model cannot accurately predict water level. This paper analyzed the hydraulic characteristics of the surge tank with long connecting pipe and its difference with the flow coefficient of the conventional throttled surge tank. Based on the throttled surge tank model, an improved flow coefficient prediction model was proposed, which is compared with that of the conventional throttled surge tank. The calculation results of the real surge tank model with long connecting pipes were compared, and the sensitivity research of connecting pipe size was carried out. The results show that when the conventional throttled surge tank model is used to simulate the extreme value of the surge water level in the surge tank with long connecting pipe, the inflow flow coefficient is too small(generally 0.6) and the outflow flow coefficient is too large(generally 0.8). The extreme values are all small;The improved flow coefficient can take into account the influence of the long connecting pipe, and the model based on the improved flow coefficient of the throttled surge tank can accurately predict the surge water level extreme value of the surge tank with the long connecting pipe.

关 键 词：抽水蓄能电站 阻抗式调压室 长连接管 流量系数 调压室涌波极值 

分 类 号：TV732.5[水利工程—水利水电工程]