喷嘴直径对离心泵自吸装置性能的影响

Effects of Nozzles Diameter on Performance of the Self-priming Equipment for Centrifugal Pumps

介绍了离心泵自吸装置中喷嘴的设计方法,设计了3种不同出口直径的喷嘴。基于FLUENT软件采用欧拉多相流模型模拟了喷嘴和气液混合管内部的气液两相流动,得到了喷嘴和气液混合管中间断面的动压分布和气液混合管4个断面内气相密度分布随喷嘴直径变化的规律。内部流场分析表明,喷嘴直径的增大有利于提高自吸装置的气液混合性能。同时,测试了喷嘴出口直径变化对自吸高度和自吸时间的影响。试验结果表明,随着喷嘴出口直径的增加,自吸装置的自吸高度明显增大,自吸时间显著缩短。

The design method for nozzle of the selfpriming equipment for centrifugal pumps was introduced and there nozzles with different outlet diameters were designed. Based on FLUENT, the flow field in the nozzle and gas - liquid mixture tube was simulated with eulerian model. The dynamic pressure distribution on the middle section and gas phase density distribution on four sections of gas - liquid mixture tube were obtained. The flow analysis shows that big diameter can improve self - priming capability. The effects of nozzle on self - priming capability were tested by experiment. The experimental indicates that the increase of nozzle outlet diameter can improve the self - priming height and shorten the self -oriming time evidently.