摘要
为探究管道壁面糙率及不同谢才系数计算公式对供水工程水力过渡过程各参数的影响,以山西省庄头泵站为依托,以4台型号为SLOW500-1050AT的水泵机组并联运行发生停泵水锤现象为计算案例,进行了停泵水锤数值模拟计算,以探究不同管道壁面糙率及谢才系数计算公式对管道的最大正负压及水泵机组倒转转速产生的影响。基于计算结果,可以得出如下结论:①合理增大壁面糙率,对管道正负压及水泵倒转转速过大会有一定的改善效果;②在一定的管道壁面糙率条件下,采用曼宁公式来和巴甫洛夫斯基公式计算停泵水锤的结果,在部分断面存在较大的差异,因此选取的壁面糙率及计算公式适宜与否是影响停泵水锤的重要因素。研究成果对供水工程水锤防护具有一定的理论指导意义。
Taking Zhuangtou pump station of Shanxi Province as an example,in the light of pumping stop water hammer in 4 SLOW500-1050AT paralleled pump units,the numerical simulation and computation for pumping stop water hammer under different pipe roughness and Chezy coefficient computation formulas were conducted to study the influences of roughness and Chezy coefficients on the maximum positive and negative pressures as well as inverted speed of the pump units.The calculation results show that(1)reasonably increasing the roughness can improve the maximum positive and negative pressures as well as inverted speed of pump in some degree;(2)for some roughnesses,the calculated water hammer results of partial cross-sections by Manning formula and Barovsky Formula differs greatly,so the proper selection of roughness and computation formula is the key for pumping stop water hammer calculation.The study results can be a theoretic guideline for water hammer protection of water supply project.
作者
王丽
吴建华
韩亚男
孙一鸣
李琨
WANG Li;WU Jianhua;HAN Yanan;SUN Yiming;LI Kun(School of Water Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《人民长江》
北大核心
2019年第7期206-210,共5页
Yangtze River
基金
山西省国际科技合作项目(201603D421011)
山西省科技推广项目
关键词
停泵水锤
水力过渡过程
壁面糙率
谢才系数
供水工程
庄头泵站
山西省
pump stop water hammer
hydraulic transition process
wall roughness
Chezy coefficient
flood engineering
Zhuangtou pump
Shanxi Province
