某立式轴流泵CFD计算与模型试验性能比较分析

Comparative analysis of CFD calculation and model test performance of a vertical axial flow pump

针对宣州区某立式轴流泵站水泵装置进行分析,验证水泵设计选型的科学性、合理性,尽量减少和避免如伴随冲击、二次流、汽蚀等有害物理现象,防止影响机组的安全运行。设计中采用CFD技术对立式轴流泵装置全流道进行了数值模拟计算,并针对进水流道、泵段、出水流道的内部流态进行了分析判断应用,从而得出立式轴流泵全工况外特性。结合水泵装置模型试验得到水泵试验外特性数据,对比试运行参数,验证了水泵基本性能。结果表明CFD计算能初步快速的判断避免不利流态,试运行的工况点水泵性能与CFD计算和模型试验结果较相近。因此,对大中型立式轴流泵站同时进行CFD计算和装置模型试验是必要的,均对水泵的性能可做出比较准确的判断。

This paper analyzes the pump device of a vertical axial flow pump station in Xuanzhou District,in order to verify the scientificity and rationality of pump design and selection,minimize and avoid harmful physical phenomena such as accompanying impact,secondary flow and cavitation,etc.And prevent the safe operation of the unit being affected.In the design,CFD technology is used to carry out numerical simulation calculation of the whole flow channel of the vertical axial flow pump device,and the internal flow patterns of the inlet flow channel,pump section and outlet flow channel are analyzed,judged and applied,so as to obtain the external characteristics of the vertical axial flow pump under all working conditions.Combined with the model test of water pump device,the external characteristic data of water pump test are obtained,and the basic performance of water pump is verified by comparing the test operation parameters.The results show that CFD calculation can preliminarily and quickly judge and avoid unfavorable flow patterns.The pump performance at the operating point of trial operation is close to the results of CFD calculation and model test.Therefore,it is necessary to carry out CFD calculation and device model test for large and medium-sized vertical axial-flow pump stations at the same time,which can make a more accurate judgment on the performance of the pump.