中隔墩对大型泵站出水流道水力性能的影响  

Influence of middle division pier on hydraulic performance in pumping station outlet conduit

作　　者：梁金栋[1] 陆林广[1] 刘荣华[1] 王刚[1] 

机构地区：[1]扬州大学水利科学与工程学院,江苏扬州225009

出　　处：《排灌机械工程学报》2011年第1期77-81,共5页Journal of Drainage and Irrigation Machinery Engineering

基　　金：'十五'国家重大技术装备研制项目(ZZ02-03-01-03/03)

摘　　要：为了研究中隔墩对大型低扬程泵装置出水流道水力性能的影响,借用某泵站的有关参数,采用三维数值计算的方法,将出水流道从泵装置中分解出来,计算了出水流道内的流态和水力损失;设置中隔墩会使设计流量时的虹吸式和直管式出水流道的水力损失分别增加0.024 m和0.033 m;采用透明流道模型试验的方法对数值计算的结果进行了验证,模型试验结果与数值计算结果基本一致;根据计算和试验结果研究了中隔墩对虹吸式和直管式出水流道水力性能的影响.研究结果表明:由于水泵导叶出口水流具有环量,出水流道内的流态存在较为明显的偏流现象,流道的水力性能在一定程度上受到中隔墩的影响;中隔墩愈长,出水流道水力性能所受的影响愈大.因此,设置中隔墩无益于出水流道的水力性能.对于大型低扬程泵站,可在满足出水流道结构设计的条件下取消中隔墩或采用较短的中隔墩.In order to study the influence of middle division pier on the hydraulic performance of a low head pump system, 3D turbulent numerical simulation method was applied to calculate the flow patterns and hydraulic losses of a separated conduit of a certain low head pumping station. Under the design discharge that the middle division pier was set in the conduit, the hydraulic： losses calculated were increased by 0. 024 m and 0. 033 m, respectively. Transparent conduit model experiments were carried out to validate the calculation results. The results of the model experiment are consistent with those of the numerical simulated ones. Based on the numerical simulation and model experiment results, the influence of the pier on the hydraulic performance for both siphon outlet conduit and straight outlet conduit were studied. The results indicate that the flow pattern in the conduit is asymmetrical due to the influence of the flow circulation at the outlet section of the pump guide vane. And consequently, the hydraulic performance of the conduit was affected to a certain extent by the pier. The longer the pier, the larger the influence. Therefore, the pier is unprofitable to the hydraulic performance of the conduit and the pier for a large pumping station with low head could be removed if the structural design condition of the conduit is permitted.

关 键 词：泵站 出水流道 中隔墩 环量 水力性能 

分 类 号：S277.9[农业科学—农业水土工程] TV136.2[农业科学—农业工程]