摘要
为满足大功率高速混流泵汽蚀性能要求,在保证水力性能的基础上,对该混流泵叶片进行了抗汽蚀的改进设计。使用CFD数值方法分别对原设计模型和改进模型进行了水力性能和汽蚀性能的预测。结合内流分析和外特性的计算结果,对改进前后的高比转数混流泵的汽蚀性能进行了对比分析,最后结合试验结果对汽蚀性能的改进效果进行评价,并探索和总结了改进高比转数混流泵叶片压力分布的方法和思路。
Cavitation performance improvement of large hydraulic machinery such as pump and turbine has been a hot topic for decades.During the design process of the pumps,in order to minimize size,weight and cost centrifugal and mixed-flow pump impellers are required to operate at the highest possible rotational speed.The rotational speed is limited by the phenomenon of cavitation.The hydraulic model of high-speed mixed-flow pump with large flow rate and high pumping head,which was designed based on the traditional method,always involves poor cavitation performance.In this paper,on the basis of the same hydraulic design parameters,two hydraulic models of high-speed mixed-flow pump were designed by using different methods,in order to investigate the cavitation and hydraulic performance of the two models,the method of computational fluid dynamics（CFD） was adopted for internal flow simulation of the high specific speed mixed-flow pump.Based on the results of numerical simulation,the influences of impeller parameters and three-dimensional configuration on pressure distribution of the blades＇ suction surfaces were analyzed.The numerical simulation results shows a better pressure distribution and lower pressure drop around the leading edge of the improved model.The research results could provide references to the design and optimization of the anti-cavitation blade.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2013年第7期1270-1273,共4页
Journal of Engineering Thermophysics
基金
国家自然科学基金(No.50906074)
关键词
大流量
高比转数
混流泵
汽蚀
large capacity
high specific speed
mixed-flow pump
cavitation
