| 非定常不稳定液固两相流动中旋涡对颗粒运动影响的数值研究 |
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| 引用本文： | 黄远东,吴文权,张红武,王光谦.非定常不稳定液固两相流动中旋涡对颗粒运动影响的数值研究[J].水科学进展,2002,13(1):1-8. |
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| 作者姓名： | 黄远东 吴文权 张红武 王光谦 |
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| 作者单位： | 1.清华大学水利系, 北京, 100084; |
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| 基金项目： | 国家自然科学基金资助项目(59890200);水利部重大项目资助 |
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| 摘 要： | 构建起双向耦合的液固两相流动旋涡动力学模型与数值方法;应用离散涡方法,计算非定常不稳定水流场;采用Lagrange方法模拟颗粒运动,颗粒对流体的反作用通过修正涡泡运动速度来实现。利用所建模型,计算了两种St数的泥沙粒子在圆柱绕流场中的运动。结果证明了液固两相流动中颗粒运动与旋涡存在着明确的相关结构:(1)当水沙混合物中的泥沙颗粒碰上旋涡时,泥沙颗粒被卷入旋涡中,被卷入旋涡中的泥沙颗粒在运动过程中始终分布于旋涡区;(2)均匀水沙混合物绕圆柱流动,由于流体流过圆柱时产生剧烈分离流动,使得在尾迹流内中等St数 (St～o (1))的泥沙颗粒从均匀水沙混合物中分离出来而往旋涡区聚集。
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| 关 键 词： | 剧烈分离 非定常不稳定流动 旋涡 颗粒运动 |
| 文章编号： | 1001-6791(2002)01-0001-08 |
| 收稿时间： | 2000-10-23 |
| 修稿时间： | 2000年10月23 |
Numerical study on the effect of vortices upon particle motion in unsteady and unstable liquid-particle two-phase flows |
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| HUANG Yuan-dong,WU Wen-quan,ZHANG Hong-wu,WANG Guang-qian.Numerical study on the effect of vortices upon particle motion in unsteady and unstable liquid-particle two-phase flows[J].Advances in Water Science,2002,13(1):1-8. |
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| Authors: | HUANG Yuan-dong WU Wen-quan ZHANG Hong-wu WANG Guang-qian |
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| Institution: | 1.Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China;2.Shanghai University of Technology, Shanghai 200093, China |
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| Abstract: | We present a numerical investigation on the two-dimensional liquid-particle two-phase flows passing a circular cylinder at high Reynolds number.Here we apply the discrete vortex method(DVM)to compute the unsteady and unstable water flows,and adopt a Lagrangian approach to simulate the particle motion in flows.We numericaly demonstrate that the definite interrelated structure exists in the particle motion and the vortices in liquid-particle two-phase flows:the motion of intermediate size particles is obviously influenced by the vortices.When water passes a circular cylinder at high Reynolds number,the unstable flow with massive separation is formed,the complicated motion of vortices exists in the wake region.The intermediate size particles are separated from the liquid-particle mixture,then move toward the wake vortex region, finally accumulate in the vortex structures. |
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| Keywords: | massive separation unsteady and unstable flow vortex particle motion |
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