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基于多相流欧拉理论对某企业大型矿浆搅拌槽内流场进行了三维模拟,深入研究了不同转速下矿浆体积分数沿径向和轴向的分布情况。数值模拟结果表明,搅拌槽内形成2个垂直环流及周向环流,对矿浆体积分数分布起到主要影响的是垂直环流。搅拌槽内矿浆流速在桨叶区出现最大值,槽体中上部流速较小;同一转速下,搅拌槽内矿浆体积分数随着垂直高度的增加而降低,搅拌槽中部矿浆体积分数基本相等,搅拌槽上部体积分数随高度的增加呈线性降低;随着转速增加,各垂直高度上的矿浆体积分数减小。
Based on the multiphase flow Eulerian theory, the flow field in a large-scale slurry agitating tank in a certain enterprise was simulated three-dimensionally, and the distribution of the slurry volume fraction along the radial and axial directions at different rotational speeds was studied. The numerical simulation results show that the vertical circulation is the main influence on the distribution of slurry volume fraction by forming two vertical circulation and circumferential circulation in the stirred tank. The maximum flow velocity of slurry in the agitated tank appeared at the upper part of the agitator, and the flow velocity in the upper part of the agitator was small. Under the same rotational speed, the volume fraction of the slurry in the agitated tank decreased with the increase of the vertical height and the volume fraction of the slurry in the middle of the agitated tank was almost equal. The volume fraction of the upper part of the tank decreases linearly with the increase of the height. With the increase of the rotating speed, the volume fraction of the slurry at each vertical height decreases.