CFD方法在灯泡式贯流泵流量与压差关系预测中的应用

Application of CFD method in prediction of relationship between discharge and differential pressure of inlet passage of bulb tubular pump

以南水北调东线工程金湖灯泡式贯流泵为例,应用标准kε紊流模型和SIMPLEC算法对灯泡式贯流泵进水流道模型的水流流场进行CFD数值模拟,得到流量与进水流道上两测压点的压差数据,线性拟合后获得流量与压差的函数关系,与模型试验测得的结果相比两者差异很小,表明用CFD方法预测进水流道中流量与压差的关系精度较高。采用相同的CFD方法对模型放大10.33倍后得到的灯泡式贯流泵进水流道原型流场进行数值模拟,预测灯泡式贯流泵原型流量与压差的函数关系。结果表明,应用CFD方法预测大型灯泡式贯流泵的流量与进水流道上两测压点压差的关系是可行的,为低扬程水泵进水流道中流量与压差函数关系的确定提供了一条新途径。

The Jinhu Pumping Station,which is located in Jiangsu Province,was built for the Eastern route of the South-to-North Water Diversion Project.In the present study,the flow field within the inlet passage of its bulb tubular pump was numerically simulated with a standard k-ε turbulence model and SIMPLEC algorithm.A functional relationship between the discharge and the differential pressure,which is linearly fitted from the computed results,was found to agree with the one from the model tests.The comparison indicates that the CFD method is sufficiently accurate to predict the relationship between the discharge and differential pressure of the inlet passage.The relationship between the discharge and the differential pressure of the prototype pump,which is 10.33 times the model pump,is also numerically predicted with the same CFD method.The results indicate that it is feasible to predict the relationship between discharge and differential pressure of two measuring points in the inlet passage of a bulb tubular pump with the CFD method.The authors therefore present a new approach to determin the relationship between discharge and differential pressure of the inlet passage of low-lift pumps.