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Analysis of single particle force and movement condition in vertical rotational flow field

DOI：

 作者 单位 E-mail 马欣 西南石油大学机电工程学院 1083698466@qq.com 赖科 西南石油大学机电工程学院

为研究单颗粒在旋转流场中的运动状态及受力分析，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、不同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：颗粒在旋转流场中平衡状态下运动状态主要分为两类，一类是未离开壁面的保持静止，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一椭圆形，并且圆心随着转速的增大靠近旋转中心，而随着粒径的增大圆心靠近壁面；并且颗粒在旋转流场中的运动过程中主要受到离心力和旋转科式力。

In this study, the movement condition of and the force analysis of single particle in rotational flow field were studied by a series of experiments. By taking the millimeter-level particle as 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 particle in different experimental section speed and particle diameter, and The formula of particle motion state and particle trajectory are obtained with fitting tests data, then to study the force anslyse 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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