水泵水轮机比转速与空化系数统计分析  

Statistical analysis of specific speed and cavitation number of pump turbine

作　　者：杨静 韩文福 周喜军 丁景焕 YANG Jing;HAN Wenfu;ZHOU Xijun;DING Jinghuan(Technology Center,State Grid Xinyuan Company Ltd.,Beijing100053,China)

机构地区：[1]国网新源控股有限公司技术中心,北京100053

出　　处：《水利水电技术》2019年第3期117-123,共7页Water Resources and Hydropower Engineering

基　　金：国网新源控股有限公司科技项目(XJKS-2013-02)

摘　　要：在抽水蓄能电站建设前期阶段,通常会根据经验公式计算确定机电设备的关键参数。为了保证新建电站的先进性及经济性,经验公式的先进性尤为重要。基于此,统计了近20a已建及拟建的48座抽水蓄能电站数据,运用最小二乘法进行数据拟合,得到了关键参数比转速及空化系数的新经验公式,并对比分析了新、旧经验公式应用于所有电站数据和已投产电站数据的误差平方和。结果表明:采用新公式计算的48个样本电站的水轮机工况比转速、水泵工况比转速、空化系数3个参数所得的最小误差平方和比误差最小的现行经验公式误差低75%、8%、77%;采用新公式计算已投产电站的误差平方和比误差最小的现行经验公式误差低70%、4%、66%。以仙居电站为例,对预估参数的可靠性进行了对比,证实了拟合新公式的准确性最高,应用于已建电站的误差更小,表明在抽水蓄能电站前期建设阶段使用新拟合的公式预估机电关键参数更为合适。In the planning and designing stages of pumping storage power (PSP ) station, the key parameters like specific speed and cavitation number need to be calculated based on the empirical formulas by designer. In order to make sure the economic and advanced of the new PSP station, the advancement of the empirical formulas is important. The data from 48 PSP stations Nhich are built and proposed to build in the recent 20 years are accumulated and applied to fit new formulas for specific speed and cavitation number using the least squares method. Compared the old empirical formulas, the sums of squared errors of specific speed under hydro-turbine condition, specific speed under pumping condition and cavitation number using the new empirical formulas respectively reduced 75%, 8% and 77% for the 48 PSP stations, and redured 70%, 4% and 66% for the built 24 PSP stations. A case study of Xianju PSP station proved the higher accuracy of new formulas by contrasting the reliobility of the estimoted parameters. The new formulas are more suitable for the planning and designing stage utilization of PSP station to esbimate the key parameters.

关 键 词：水泵水轮机 比转速 空化系数 经验公式 

分 类 号：TV734[水利工程—水利水电工程]