中隔墩对WES堰流量系数影响研究

Research on the Influence of the Divisionpier on the Discharge Coefficient of WES Weir

为了定量分析中隔墩对WES堰泄流能力的影响,采用试验方法研究了墩头为半圆形的中隔墩在不同水头下的流量系数,并与无中隔墩情况进行了对比分析,并采用数值模拟方法,分析了设置中隔墩后流量系数减小的原因,研究结果表明:中隔墩对泄流能力的影响可用侧收缩系数反映,堰前有无引流明渠对中隔墩侧收缩系数影响不大;有无边墩对中隔墩侧收缩系数影响不大;在试验体型下,侧收缩系数为0.969~0.978;数值模拟表明,设置中隔墩后,能量损失主要发生在其尾部。

In order to analyze the effect of divisionpier on the discharge capacity of WES weir quantitatively,the discharge coefficient of a semicircular divisionpier under different water heads are studied by means of an experimental method in this paper,and the results are compared with those without divisionpier,the reasons for the decrease in discharge coefficient after setting up the divisionpier are analyzed by numerical simulation method.The results show that:the effect of divisionpier on discharge capacity can be reflected by the lateral contraction coefficient,there is little effect on the lateral contraction coefficient of the divisionpier with or without draining open channel in front of weir.The same is true of abutment pier.What's more,the lateral contraction coefficient is 0.969~0.978 under the experimental shape of this paper.Finally,the numerical simulation shows that the energy loss mainly occurs at the tail of the divisionpier.