不同涡设计下混流泵叶轮参数分析与性能优化

Influence of Different Vortex Design on Parameter Analysis and Performance Optimization of Mixed-flow Pump Impeller

摘要:

根据环量分布形式不同，可将混流泵设计分为自由涡、强迫涡和复合涡设计。以一导叶式混流泵叶轮为研究对象，通过采用反问题设计方法控制叶轮出口处环量分布形式，结合正交试验设计方法，对比分析了自由涡和复合涡设计对混流泵叶轮的参数分析及性能优化结果的影响。研究结果表明：环量控制参数rvh和rvs对所有工况下效率及扬程均具有较大影响；与原始模型相比，自由涡设计优化结果在0.8、1.0、1.2倍设计流量处效率分别增加0.31、1.63、1.03个百分点，而复合涡设计优化结果效率分别增加了1.09、3.51、9.71个百分点，且设计流量处三者扬程差较小；内流分析结果表明采用考虑环量分布的复合涡设计有利于叶轮出口处流态的进一步改善从而降低叶轮下游部件水力损失。

Abstract:

According to different forms of circulation distribution, mixed flow pump design can be divided into free vortex, forced vortex, and composite vortex designs. A mixed flow pump model TJ-HL-05, whose performance has been widely verified in the South to North Water Transfer Project, was taken as the research object. Based on the inverse design method, the parameterization of the impeller blade under the nonlinear circulation distribution was realized with the help of the continuity equation, the energy equation and the simplified radial balance equation. On this basis, the parameter analysis of the mixed flow pump impeller under the nonlinear circulation distribution under different working conditions was studied by using the orthogonal experimental design, and the performance optimization of the mixed flow pump was completed-based on the analysis results. The results showed that the circulation control parameters rvh and rvs had a significant impact on efficiency and head under all operating conditions, and compared with traditional free vortex design, compound vortex design had a higher optimization upper limit. Compared with the original model, the efficiency of the free vortex design optimization results was increased by 0.31 percentage points, 1.63 percentage points, and 1.03 percentage points respectively under the 0.8Qdes, Qdes, and 1.2Qdes operating conditions, while the efficiency of the composite vortex design optimization results was increased by 1.09 percentage points, 3.51 percentage points, and 9.71 percentage points, respectively, and the head difference between the three under the design operating conditions was relatively small. The results of the internal flow analysis indicated that using a compound vortex design that considered the distribution of circulation was beneficial for further improving the flow state at the outlet of the impeller, thereby reducing the hydraulic losses of downstream components of the impeller.