中文摘要：

为了研究喷雾造粒塔内的流动特性,采用相位多普勒粒子分析仪（PDPA）测量了塔内的速度分布,数值模拟了不同结构参数下的流场演变过程,并根据速度分布对喷雾造粒塔内流场进行了区域划分。结果表明,喷嘴径向位置对流动影响较大,而操作参数的影响相对较小;喷雾造粒塔内速度分布在不同风量下基本相同,沿轴向有两个明显的区域分布,即喷雾造粒塔上部靠近喷嘴,受射流影响较大,流动比较复杂,沿轴向的下部远离喷嘴,射流影响逐渐减弱,流动规律性明显增强。喷雾造粒塔内速度分布与蜗壳式旋风分离器内的速度分布差别较大。

英文摘要：

Aiming to identify the hydrodynamics of the swirling flow driven by jet array, an experimental investigation was conducted by using the phase Doppler particle anemometer （PDPA）, and then the evolution of flow field in different structures was studied by numerical simulation, and the flow field in the spray tower was divided according to the velocity distribution. The results showed that the structural parameters, such as the radial position of nozzle, had a great effect on the flow pattern, while the operating parameters had less effect. The velocity distributions in spray tower were similar at different gas flow-rates. There were two obviously different regions along axial direction, that was, in upper part near nozzles of the tower the flow was complex because of the obvious jet effect, on the contrary, in lower part far away the nozzles the flow was comparatively regular because of the jet effect becoming weak. The velocity distribution in spray tower was much more different from that in volute cyclone separator.