双吸双流道泵气固液三相流动特性分析

发布时间：2018-02-26 09:05

本文关键词： 双吸双流道泵气固液汽蚀固相　出处：《流体机械》2017年07期 　论文类型：期刊论文

【摘要】：为探究非对称双吸双流道泵的内部流动规律,基于CFD性能预测方法,采用Mixture多相流模型,充分考虑汽蚀作用,计算双吸双流道泵在气固液三相联合作用下的速度-压力分布规律以及气相与固相的体积分布特点,并且考虑不同的计算方法叶轮中截面的压力分布。计算结果表明:在叶轮的头部区域存在一局部低压漩涡区,在恶劣环境工况,最终演变为汽蚀的发生。固相颗粒主要分布在靠近上下盖板的内表面,气相主要分布在叶片的头部区域。不同的计算方法,压力分布趋势基本相同,若考虑固相颗粒的作用,叶轮出口压力更高,压力梯度更大。若考虑汽蚀的作用,叶片头部的低压区范围更宽广,汽蚀现象更严重,但发生汽蚀的部位不会改变。
[Abstract]:In order to investigate the internal flow law of asymmetric double-suction double-channel pump, based on CFD performance prediction method, Mixture multiphase flow model is adopted to fully consider cavitation. The velocity-pressure distribution law and the volume distribution characteristics of gas phase and solid phase of double-suction double-channel pump under the action of gas-solid-liquid three-phase combination are calculated. The calculation results show that there is a local low pressure swirl region in the impeller head region, and it is found that the pressure distribution in the impeller is in a bad environment. The solid particles are mainly distributed near the inner surface of the upper and lower cover plate, and the gas phase is mainly distributed in the head area of the blade. The pressure distribution trend is basically the same in different calculation methods, if the effect of the solid particles is considered, The impeller outlet pressure is higher and the pressure gradient is larger. If cavitation is considered, the low pressure area of the blade head is wider and the cavitation phenomenon is more serious, but the cavitation position will not change.
【作者单位】：国网四川省电力公司广元供电公司;国网陕西省电力公司培训中心;东南大学;
【分类号】：TH38

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