侧吹气体射流穿透行为的研究

Research on the Behavior of Side-blown Gas Jet

定量研究了侧吹气体在液体中穿透行为的变化规律,通过摄像获得了侧吹气体射流的一些形态特征,并对侧吹气体射流的结构进行了划分。基于单个气泡在液体中的运动进行受力分析,以它的运动轨迹作为侧吹气体射流的轴线,建立了描述浸入式侧吹气体射流在液体中的运动轨迹模型。在此基础上对模型进行了实验验证并与前人的研究成果进行比较,结果表明在同一气液体系内,侧吹气体射流出口速度相同的情况下,射流的穿透深度与喷嘴直径的0.54次幂成正比。与前人的理论模型相比,所提出的理论模型具有良好的可靠性,能较好地描述浸入式侧吹气体射流在液体中的形态。

The behavior of side-blown gas discharging into a liquid is researched by quantitative method. The shapes of side-blown gas jet are obtained by the camera, and the structure partition of gas jet are put forward. A novel model for predicting the trajectory of the side-blown gas jet in the liquid is proposed on the basis of the force analysis of a single bubble movement, the trajectory of the bubble movement which is calculated as the axis of side-blown gas jet. Comparison between the calculation results and the reported empirical formula are investigat- ed. The results show that the jet penetration is a direct proportion to the 0.54 power of the nozzle diameter with the same velocity in the same gas-liquid system. The theoretical model proposed has good reliability and provide a better description of the shape of side-blown gas jet in the liquid.