中文摘要：

采用线性分布的轴面流线速度环量和叶片角度变化规律来设计叶轮,采用圆弧翼型进行固定导叶的设计,蜗壳断面采用非对称断面,进而设计了一叶片可调比转数为564.3的蜗壳式混流泵。应用FLUENT对该泵的内部流动进行了数值模拟并根据模拟结果进行了能量性能预测。内流模拟结果显示该泵内部流动均匀,性能预测结果表明该泵可以满足设计要求。真机性能测试表明该泵在叶片角度为0°时最高运行效率达85.76%,在设计点运行效率要比设计要求高约3%。研究结果对于更高比转数蜗壳式混流泵的设计具有比较重要的指导作用。

英文摘要：

The characteristics and research actuality on mixed flow pumps are introduced simplely.A mixed flow pump with volute as diffusion part is designed and its specific speed is 556.8.The axial velocity circulation and blade angle variety with linearity distribution are used to deisign the impeller.The fixed diffeuser between impeller and volute is deigned by arc airfoil.The cross sections of volute are all asymmetry.The commercial code FLUENT is applied to simulate the inner flow in the mixed flow pump and its energy characteristics are predicted according to the simulation results.The inner flow analysis indicates that the flow in the pump is good and the characteristic presiction shows that the pump performance can meet the design demand.The experiment test of the pump are done.When the blade angle is about 0°,the maximum efficiency of the pump is up to 85.76% and the actual efficiency at design point is about 3% higher than demand efficiency.The study fruits can instruct the hydraulic design of higher specific speed mixed flow pump with volute as diffusion part.