基于CFD的反渗透海水淡化高压泵的性能预测

运用FLUENT软件,在双参考坐标系下,采用基于雷诺时均的Navier-Stokes方程和标准k-ε湍流模型,对万吨级反渗透海水淡化高压泵的6组水力模型的叶轮与导叶组合的内部流场进行了数值模拟和性能预测,并挑选出两组效率高的水力模型制作成2台单级模型泵进行试验研究.结果表明：根据计算的数据预测该泵单级的特性曲线,并与试验数据进行了比较,两者在高效区流量-扬程曲线比较接近,误差在工程应用允许范围内.CFD计算中没有计入容积损失和机械损失,实测轴功率普遍都要比模拟轴功率稍大,进行修正后试验所得出的效率和模拟所得到的效率接近.经试验模型泵的效率接近80%.

Performance predictions of high pressure pump for 10000 tons reverse osmosis desalination system based on CFD

The internal flows of six groups of high pressure pump for 10 000 tons Reverse Osmosis Desalination System hydraulic model were simulated by FLUENT, and their performance characteristics were predicted by using Reynolds-averaged Navier-Stokes （RANS） equations, k -ε turbulence model and multi-reference frame. Two groups of high-efficiency hydraulic model were selected to combine two singlestage model pumps for test research. Comparing the prediction and test performances, the capacity-head curve is closer near the flow region with high efficiency; the error is within the permitted extent by the engineering application. The efficiency from test is lower than that from simulation, because in CFD calculation the volumetric loss and mechanical loss are not considered. The adjusted data from simulation is close to the experimental one. The test shows that the efficiency of the model pump is close to 80%.