补料长度对井筒式出水流道水力性能的影响

Effect of feeding length on hydraulic performance of wellbore outflow conduit

为研究补料长度L对立式潜水轴流泵装置中井筒式出水流道水力性能的影响,设置L=0mm、L=60mm及L=120mm的3种补料长度方案,并基于RNGk-ε模型对泵装置进行定常CFD数值模拟。研究不同补料长度下井筒式出水流道特征断面内部流动特性、水力损失及泵装置扬程效率,结构表明:补料长度越大,出水管内部的流态越平顺、静压分布越均匀,出水流道的水力损失越小,泵装置不同流量下的扬程效率也越高。综合来看,在井筒及出水管的连接段增设一定长度的补料能够有效地平缓出水管进口的流态,但过长的补料区域会带来加工上的不便,不能很好的体现立式潜水轴流泵装置的经济实用性,因此,在实际工程中,应该结合实际成本综合考虑。

In order to study the influence of feeding length L on the hydraulic performance of wellbore outflow conduit in vertical submersible axial flow pump device,three feeding length schemes( L = 0 mm,L = 60 mm and L =120 mm) were set up,and steady CFD numerical simulation of pump device was carried out based on RNG k-εmodel. By studying the flow characteristics,hydraulic loss and pump lift efficiency in the characteristic section of the wellbore outlet channel with different feeding length,it was found that the longer the feeding length was,the smoother the flow pattern in the outlet pipe was,the more uniform the static pressure distribution was,the smaller the hydraulic loss of the outlet channel was,and the higher the lift efficiency of the pump device with different flow rate was. Generally speaking,adding a certain feeding length to the connecting section of wellbore and outlet pipe could effectively smooth the flow pattern of outlet pipe,but too long feeding area would bring processing inconvenience and could not well reflect the economic practicability of vertical submersible axial flow pump device. Therefore,in practical engineering,comprehensive consideration should be given to actual cost.