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中南大学学报(自然科学版)

Journal of Central South University

第47卷    第4期    总第260期    2016年4月

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文章编号:1672-7207(2016)04-1158-08
径向偏移对球阀液固两相流场及流通特性的影响
马艺1, 2,张生昌1, 2,马中强1,邓鸿英1, 2,张志鸿1

(1. 浙江工业大学 化工机械设计研究所,浙江 杭州,310014;
2. 过程装备及其再制造教育部工程研究中心,浙江 杭州,310014
)

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。

 

关键字: 球阀;两相流;浓度场;液动力;流量系数

Influence of radial displacement on liquid-solid two-phase flow field and characteristics in ball valve
MA Yi1, 2, ZHANG Shengchang1, 2, MA Zhongqiang1, DENG Hongying1, 2, ZHANG Zhihong1

1. Institute of Process Equipment and Control Engineering, Zhejiang University of Technology, Hangzhou 310014, China;
2. Engineering Research Center of Process Equipment and Remanufacturing,
Ministry of Education, Hangzhou 310014, China

Abstract:Based on the dynamics analysis of ball’s motion, the discharge ball valve was studied as the key component of liquid-solid reciprocating pump by CFD numerical simulation. The impacts of ball’s radial displacement on two-phase flow inside the ball valve were analyzed, and the distributions of volume fraction and pressure field were predicted. Therefore, the changes of flow forces and characteristics with ball’s radial displacement were obtained at different valve’s opening heights and solid mass fractions. The results show that the secondary vortex is aggravated and the solid particles show hump-like distribution partially in the opposite side of ball’s radial displacement. The changes of forces on the ball with radial displacement are similar to those of pressure drop inside the valve, and in the order of significant effect on the radial component of forces, the factors are opening height, radial displacement, solid mass fraction successively. On the other hand, the flow coefficients range from 0.38 to 0.70 as the solid mass fractions grow from 20% to 80%, and the flow capacity has slight fluctuations with ball’s radial displacement.

 

Key words: ball valve; two-phase flow; concentration field; flow dynamic force; flow coefficient

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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