The spray process of CTST in a 570 mm diameter column was experimentally investigated using a high-speed camera, and a theoretical model for the average droplet size study was established according to the unstable wave theory. The results demonstrate that gas velocity is the key factor affecting the spray angle which increases gradually with the increase of the gas velocity. When the gas velocity exceeds 7.5 m⋅s-1, the spray angle becomes stable around 55˚. The velocity of the liquid film at the spray-hole increases significantly with the increase of the gas velocity, which decreases slightly with the increase of the liquid flow rate. Moreover, the liquid film velocity increases from the bottom to the top of the spray hole. The drop distribution density around the spray area is close to the Rosin-Rammler function and concentrated in the spray angle between 20˚to 40˚. It gradually becomes uniformly distributed with the increase of the gas velocity and liquid flow rate. The average drop size deceases with gas velocity increase, which increases slightly with the increase of the liquid flow rate. The average drop size is about 1.0 to 2.5 mm in a typical working range.%立体喷射型塔板的喷射状况对气液两相接触面积有重要影响。在直径570 mm的冷模实验塔内，采用高速摄像仪对CTST的喷射过程参数进行了实验研究，并且基于不稳定波动理论建立了液滴群平均粒径的计算模型。结果表明：喷射孔气速是影响喷射锥角的关键因素，随着喷射孔气速的增加喷射锥角逐渐增大，当喷射孔气速超过7.5 m⋅s-1时，喷射锥角趋于恒定，其数值稳定在55°左右。随着气速的增加喷射孔处液膜速度显著增大，而液体流量增加时液膜速度略有减小，越靠近喷射孔顶端液膜速度越大。喷射区域内液滴的分布密度接近于Rosin-Rammler分布，在喷射锥角为[20º，40º]区间内的液滴数量比较集中，随着气速和液体流量的增大，液滴分布密度逐渐趋于均匀。液滴群平均粒径随气速的增加而减小，随液量的增加略有增大。正常工作范围内，液滴群平均粒径为1.0~2.5 mm。
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