水利水电技术2011，Vol.42Issue(11)：82-84,3.
泵系统不同出流方式下的水锤计算分析
Calculation and analysis on water hammer under different outflow modes of pump system
摘要
Abstract
When pump system operates in a free outflow mode, the level of the outlet cross-section piezometer during the hydraulic transient process is different from the level that basically invariable during the operation mode of submerged discharge. Taking the outlet section as a special hydraulic element, the hydraulic transient process under the free outflow mode of pump system is calculated herein with the method of characteristics. For a same pump, it is known from the calculation made on the water hammer during the accident shutdown of pump that if compared with the submerged discharge, the flow pressure of the pipeline can be increased by the free outflow mode, which is favorable for the water hammer protection. Under the operation mode of free outflow, flap valve or air-inlet valve are not necessary to be installed in pump system. However, more energy will be lost by the free outflow mode, if compared with that of the submerged discharge mode. From the aspects of both the water hammer protection and the maintenance of pumping station, the free outflow mode will be a better operation scheme, when the changing amplitude of the water level in the outlet sump of pumping station is less and the annual operation period is short.关键词
水泵站/水锤计算/自由出流/淹没出流Key words
pumping station/ water hammer calculation/ free outflow, submerged discharge分类
建筑与水利引用本文复制引用
于永海,秦晓峰,成斌..泵系统不同出流方式下的水锤计算分析[J].水利水电技术,2011,42(11):82-84,3.基金项目
"十一五"国家科技支撑计划项目(2006BAD11 B07). （2006BAD11 B07）
