【摘要】 针对潜水轴流泵进行水力性能优化设计,在满足设计要求的基础上,实现其叶轮水力效率的提高。以比转速n_s=1 000的轴流泵为研究对象,借助STAR CCM+商用仿真平台,以N-S方程为基本控制方程,湍流模型为标准k-ε双方程,分别对5种轮毂比的潜水轴流泵模型在3个流量工况下进行数值模拟计算,确定该轴流泵的最佳轮毂比,并对优化前后模型进行水力性能对比分析。结果表明:由原始轮毂比0. 40缩小至最优轮毂比0. 38后,流道过流面积增大,轴流泵叶轮的水力性能得到明显提升,满足设计工况要求,叶轮扬程从4. 18 m提高到4. 27 m,水力效率从90. 44%提高到91. 46%,同时高效区明显扩大。从内部流动特性分析得出,优化后叶轮内部流线分布均匀,无脱流、旋涡等不良流态现象,流体损失较小。更多还原

【Abstract】 The hydraulic performance optimum design was carried out to improve the hydraulic efficiency of the submersible axial flow pump,in addition to meeting the design requirements. Taking the axial flow pump with specific speed n_s= 1 000 as the study object,with the aid of STAR CCM +commercial simulation platform,taking the N-S equation as the basic governing equation and the standard k-ε dual equation as the turbulence model,the submersible axial flow pump models were numerically simulated with five hub/tip ratios under three flow conditions. The results of external characteristics were analyzed to determine the optimum hub/tip ratio of the axial flow pump. The comparison of computation results before and after the optimization was made. The comparison showed that when the hub/tip ratio was reduced from original 0. 40 to 0. 38,the flow area was increased and the hydraulic performance of the impeller was significantly improved,which all satisfied the design requirements. The lift of the impeller was increased from 4. 18 m to 4. 27 m,the hydraulic efficiency was increased from 90. 44% to 91. 46%,and the high efficiency area was substantially enlarged. From the analysis of the internal flow characteristics,it was concluded that the streamlines were uniformly distributed, no adverse flow phenomena such as decurrent or vortices were observed,and the fluid loss was low.更多还原