调压室阻抗孔尺寸选择的研究  

Research on the size selection of impedance hole of surge chamber for hydropower station

作　　者：童祥 张晓宏[1] 张俊发[1] TONG Xiang;ZHANG Xiaohong;ZHANG Junfa(Faculty of Water Resources and Hydro-electric Engineering,Xi＇an University of Technology,Xi＇an 710048,China)

机构地区：[1]西安理工大学水利水电学院,陕西西安710048

出　　处：《水资源与水工程学报》2018年第4期168-171,176,共5页Journal of Water Resources and Water Engineering

基　　金：国家自然科学基金项目(51279162)

摘　　要：为了更深入研究阻抗式调压室阻抗孔尺寸与压力引水道断面尺寸的比值关系对调节保证计算结果的影响,采用非恒定流计算特征线法,以3条引水支管共用阻抗式调压室的工程实例为研究对象,进行了水电站压力引水系统仿真计算研究。通过对调压室涌浪水位、机组最大转速升高率和蜗壳末端最大水锤相对升压值计算成果的分析,得出调节保证计算参数均满足设计规范要求的前提下,阻抗式调压室阻抗孔面积与压力引水道断面面积比值的合理取值范围为28%~46%。该结论对指导类似工程建设具有一定的实际意义。In order to study more deeply on the influence of the relationship between the impedance ratio of the impedance surge chamber and the size of the pressure channel cross section on the adjustment guarantee calculation results,this paper takes the three water diversion branch common impedance surge chamber as example,and uses the non-steady flow characteristic line method to simulate the pressure diversion system of the hydropower station.Through analysis of surge water level of surge tank,maximum rate of increase of unit speed,and relative pressure increase value of the maximum water hammer at the end of the volute,we concluded that the reasonable range of the ratio of the impedance hole area to the section area of the pressure channel is 28%~46% under the condition that the parameters of the regulation guarantee meet the requirements of the design specification.This conclusion can guide the construction of similar projects.

关 键 词：调压室 阻抗孔 断面设计 调节保证计算 压力引水道 

分 类 号：TV732.5[水利工程—水利水电工程]