高压泵反转式液力透平性能模拟与试验

以离心泵水力设计为基础,参考水轮机水力设计,通过Pro-E建立液力透平的三维模型,运用CFD技术对四组出口安放角不同的模型进行了不同工况下的内部流场流动分析,计算采用雷诺时均N-S方程和标准k-ε湍流模型,压力和速度耦合采用SIMPLEC算法。模拟结果较好地揭示了内部流场的特征,对内部流场的静压分布特征进行了研究。研究结果表明叶轮内静压值随流动方向呈下降趋势,叶轮与导叶相互影响,叶轮流场不对称导致流场不稳定。对液力透平性能进行预测,从中筛选出最优模型。将模拟结果与样机试验结果作分析对比,对比结果表明实测扬程与效率和模拟扬程与效率相差很小;实测扬程与模拟值有较小的差别;实测回收功率比模拟功率稍小。因此,出口安放角为450的液力透平模型是符合要求的。

The Performance Simulation and Experiment of High Pressure Hydraulic Turbine

The turbines are designed based on the design of centrifugal pumps.Based on Reynolds averaged N-S equation and k-ε model,the SIMPLEC algorithm is used in the impeller-volute coupled characteristics.The three-dimensional model of turbine is established by Pro-E,the flow field of four turbines under different conditions is analyzed by CFD.The static pressure distribution in interior flow field is obtained.The study shows that the static pressure decreases with the flow direction,and there is interaction between the impeller and the guide vane,the flow field of impeller is asymmetry,which makes it instable.The performance is predicted,and the optimal model is selected.The simulation results with prototype test are compared.The results show that the difference between experiments and simulation is very small,the measured power is smaller than the analog power.Therefore,the model of the hydraulic turbine meets practical requirements.