径向偏移对球阀液固两相流场及流通特性的影响

发布时间：2018-01-12 05:03

本文关键词：径向偏移对球阀液固两相流场及流通特性的影响　出处：《中南大学学报(自然科学版)》2016年04期 　论文类型：期刊论文

【摘要】：基于球阀基本动力学分析,利用CFD数值模拟手段对往复式液固混输泵的咽喉部件,即排出球阀开展研究,分析阀球径向偏移对高浓度两相流场的影响,预测球阀内部体积分数和压力场分布状态,并进一步考察在各开启高度和固相质量分数下,球阀所受作用力和流通能力随偏移距离的变化规律。研究结果表明:球阀偏移相反侧存在严重的二次涡流,固相颗粒呈驼峰状分布;阀球所受作用力随径向偏移的变化趋势与进出口压降较为相似,各影响因素对其径向分力的显著程度由大到小顺序为:开启高度,阀球偏移距离,固相质量分数;当固相质量分数由20%增至80%时,球阀的流量系数变化范围为0.38~0.70,液固两相流通能力随阀球径向偏移略有波动。
[Abstract]:Based on the basic dynamic analysis of ball valve, the throat parts of reciprocating liquid-solid mixed pump, I. E. the discharge ball valve, are studied by CFD numerical simulation method, and the effect of radial displacement of valve ball on high concentration two-phase flow field is analyzed. The distribution of volume fraction and pressure field in the ball valve was predicted, and the open height and solid mass fraction were further investigated. The variation of the force and flow capacity of the ball valve with the deviation distance. The results show that there is a serious secondary eddy current on the opposite side of the ball valve offset, and the solid particles are humped; The variation trend of the force acting on the valve ball with radial deviation is similar to that of the inlet and outlet pressure drop, and the significant degree of the influence factors on the radial component force is: the opening height, the offset distance of the valve ball. Solid mass fraction; When the mass fraction of solid phase is increased from 20% to 80, the flow coefficient of the ball valve varies from 0.38 to 0.70, and the liquid-solid two-phase flow capacity fluctuates slightly with the radial deviation of the ball.
【作者单位】：浙江工业大学化工机械设计研究所;过程装备及其再制造教育部工程研究中心;
【基金】：国家自然科学基金资助项目(51406183) 浙江省自然科学基金资助项目(LY12E05023) 浙江省教育厅科研项目资助(Y201329551)~~
【分类号】：O359;TH134
【正文快照】： 液压驱动往复泵具有结构简单、流量均匀、耐磨损等特点,在输送高浓度、高黏度复杂介质时具有突出优势,是国内外产品附加值较高的高新技术泵类之一[1-3]。在输送高浓度液固两相流时,往复泵液力端将其加压至排出球阀底部[4],推开阀球,阀球迅速升起,从而实现排出过程,因此,在高浓

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