斜式轴流泵装置进水流道的正交优化设计  

Design optimization of inlet conduit in slanted axial-flow pump installation by orthogonal array experiment

作　　者：黄健勇[1] 张飞珍[1] 张浩[1] 杨晓霞[1] 张睿[2] 

机构地区：[1]杭州市南排工程建设管理处,浙江杭州310000 [2]上海大学上海市应用数学和力学研究所,上海200072

出　　处：《排灌机械工程学报》2013年第9期741-746,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：浙江省重大科技专项计划项目(2011C11068)

摘　　要：为改善小流量工况下大型斜式轴流泵装置的水力性能,利用J-Groove流动控制手段对泵装置进水流道进行结构改进.利用正交试验设计方法,确定J-Groove的厚度、长度、个数以及分布角等4个几何因素,分别选取3个水平,建立9组正交试验方案.结合滤波器湍流模型(FBM)的非定常雷诺方程,利用Ansys CFX软件对斜式轴流泵装置三维模型进行非定常计算,获得正交方案在小流量工况下的扬程和效率.采用极差分析方法对正交试验方案的数值结果进行分析,研究各几何因素对轴流泵水力性能的影响规律.结果表明:影响扬程指标的几何因素主次关系为厚度、长度、个数和分布角;影响效率指标的几何因素主次关系为厚度、个数、分布角和长度.最后,通过再设计分析确定了最优方案,并与原始方案的流场进行对比分析,验证了J-Groove技术在小流量工况下抑制轴流泵叶轮进口非稳定流态并改善其水力性能的作用.In order to improve hydraulic performance of a slanted axial-flow pump installation at low flow rate conditions,a simple flow control method J-Groove was utilized to modify inlet conduit structure. J-Groove depth,length,number of grooves and groove stagger angle were selected to be design factors,and each factor has three levels,then nine design cases were determined by using orthogonal array experiment method. The unsteady Reynolds averaged Navier- Stokes equations based on the filter-based turbulence model were solved by using Ansys CFX to obtain the efficiency and head of each pump in those cases at low flow rates. Based on the range analysis method,the computed results were analyzed to get regularities that how the performance of the pump is affected by those factors. It was shown that the pump head is affected by the geometrical factors in the following order: groove depth,length,number of grooves and stagger angle,while the efficiency by the factors in the order: depth,number of grooves,stager angle and groove length. At last,an optimal design was established by using redesign analysis and compared with the original design. The results verified the function of the JGroove technique in suppressing unsteady flow in the impeller inlet and improving performance of a slanted axial-flow pump installation at low flow rate conditions.

关 键 词：斜式轴流泵 进水流道 流动控制 水力性能 正交设计 

分 类 号：TH[机械工程]