不同含气率下混流泵叶轮内流场特性分析

发布时间：2018-01-06 23:09

本文关键词：不同含气率下混流泵叶轮内流场特性分析　出处：《热能动力工程》2017年05期 　论文类型：期刊论文

【摘要】：为了研究含气率下混流泵运行过程中叶轮内部的流动及压力变化情况,以某厂生产的导叶式混流泵为研究对象,应用商业CFD软件对不同含气率条件下额定流量运行过程中的混流泵进行瞬态数值模拟计算。结果表明:当泵进口含气率小于10%时,对叶轮流道内的压力分布与气相分布影响不明显,叶片上的压力波动变化幅度不大;当含气率大于10%时,气体逐渐在叶轮流道局部区域上聚集,叶轮上的压力脉动主频振幅开始逐渐增大,且在其出口处的压力脉动最为剧烈,并伴随着局部高压现象的发生。
[Abstract]:In order to study the flow and pressure change in the impeller during the operation of the mixed-flow pump with gas content, the guide vane mixed flow pump produced by a factory was taken as the research object. By using commercial CFD software, the transient numerical simulation of the mixed flow pump under the condition of rated flow rate is carried out. The results show that when the inlet gas content of the pump is less than 10. There is no obvious effect on the pressure distribution and gas phase distribution in the impeller passage, but the pressure fluctuation on the blade is not obvious. When the gas content is greater than 10, the gas gradually accumulates in the local region of impeller runner, and the main frequency amplitude of pressure pulsation on impeller increases gradually, and the pressure pulsation at the outlet of impeller is the most intense. And accompanied by the occurrence of local high pressure phenomenon.
【作者单位】：西华大学能源与动力工程学院;四川省农业机械研究设计院;
【基金】：国家自然科学基金资助项目(51379179) 四川省科技计划项目(2017JY0047,2017NZ0031)
【分类号】：TH313
【正文快照】： 引言混流泵按结构分为蜗壳式混流泵和导叶式混流泵[1],其中,导叶式混流泵大量用作电站供水的主泵使用,是控制水循环的关键组件。但在输送管道发生破口事故时,混流泵内将出现复杂的气液两相流动,叶轮作为混流泵的关键过流部件将会受到破坏,进而导致混流泵性能下降及机组振动。

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