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

Abstract: 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.

Key words: pump stop water hammer, hydraulic transition process, wall roughness, Chezy coefficient, flood engineering, Zhuangtou pump, Shanxi Province