| 赖科,马欣.垂直旋转流场中单颗粒运动状态判别及受力分析[J].计算力学学报,2019,36(1):59~64 |
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| 垂直旋转流场中单颗粒运动状态判别及受力分析 |
| Analysis of single particle force and movement condition in vertical rotational flow field |
| 投稿时间：2017-07-24 修订日期：2017-11-03 |
| DOI：10.7511/jslx20170724003 |
| 中文关键词: 单颗粒 旋转流场 运动状态 运动轨迹 受力分析 |
| 英文关键词:single particle rotational flow field movement condition movement trajectories force analysis |
| 基金项目:国家重点研发计划（2016YFC0304008）资助项目. |
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| 中文摘要: |
| 为研究单颗粒在旋转流场中的运动状态及受力情况，以毫米级球形颗粒为例，利用旋转流场颗粒运动装置，通过使用摄像机记录颗粒在流场中的运动轨迹以获取其运动参数，分析了不同转速和颗粒直径条件下颗粒的运动轨迹，拟合得到了颗粒运动状态判别公式以及颗粒运动轨迹公式，分析了颗粒在旋转流场中的受力情况。结果表明，颗粒在旋转流场平衡状态下运动状态主要分为两类，一类是未离开壁面保持静止，另一类是离开壁面保持稳定周向运动；颗粒进行周向运动的轨迹为椭圆形，并且圆心随着转速的增大靠近旋转中心，而随着粒径的增大靠近壁面；颗粒在旋转流场的运动过程中主要受到离心力和旋转科式力作用。 |
| 英文摘要: |
| In this study,the motion state movement condition of and the force analysis of a single particle in a rotational flow field were studied by a series of experiments.Taking the millimeter-level particle as an examples.In the experiments,a camera was used to record the trajectories of particle in the rotational flow field to obtain the motion parameters,to analyze the variation law of trajectories of the particle in different experimental section speed and particle diameter.The formula of the particle motion state and particle trajectory is obtained with fitted tests data,then to study the force analysis is of single particle in rotational flow field.The results show that there are two main types of movement condition at equilibrium state in rotational flow field:one is not leaving the wall to remain stationary,the other is leaving the wall to keep the circular motion.The trajectory of the particles is an ellipse,and the center of the ellipse is close to the center of rotation as the speed increases,but as the particle size increases,the center of the ellipse approaches the wall.The particles are mainly subjected to centrifugal forces and rotating forces during the movement of the particles in the rotating flow field. |
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