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为了更为深刻地认识与理解喷雾降尘机理,研究了射流雾滴的尾流流场以及射流雾滴尾流对尘粒沉降运动的影响。利用Fluent软件模拟研究了静止雾滴绕流流场,通过伽利略坐标变换得到射流雾滴尾流速度分布,继而获得尘粒迎风面平均气流速度;由尘粒受力分析可知尘粒所受流体曳力是尘粒运动的主要作用力,为此建立了尘粒迎风面平均气流速度与尘粒所受雾滴尾流流体曳力之间的关系。研究表明,射流雾滴背风面为非均匀尾流流场,发生了流动分离,雾滴迎风面与背风面的流线不再对称;喷雾降尘中射流雾滴的尾流效应对尘粒的沉降运动起加速作用,且影响作用关系为:尘粒与雾滴的粒径比d/D>轴向间距s/D>射流雾滴雷诺数Re_D。
In order to understand and understand the mechanism of spray dustfall more deeply, the wake flow field of jet droplets and the effect of droplet jet flow on the deposition of dust particles were studied. Fluent software was used to simulate the flow field around the stationary droplets and the jet velocity distribution was obtained by means of the Galilean coordinate transformation. The average airflow velocity on the windward side of the dust particles was obtained. From the force analysis of the dust particles, The force is the main force of the particle motion. For this reason, the relationship between the average airflow velocity of the windward side of the dust particle and the drag force of the fluid of the fog drop wake received by the dust particle is established. The results show that the jet labyrinth is a non-uniform wake flow field, and the flow separation occurs. The flow line between the windward and leeward sides of the droplet is no longer symmetrical. Motion acceleration, and the impact of the relationship as follows: the ratio of particle size to dust droplets d / D> axial spacing s / D> jet droplets Reynolds number Re_D.