关键词: 液体喷雾, 喷雾滴径, 最大熵模型

Abstract: The atomized droplet size distribution of pressure swirl nozzle was obtained through Planar Laser Induced Fluorescence（PLIF）method in different liquid flows. The theoretical droplet size distribution was predicted using the three parameter maximum entropy model，which was constrained by average droplet size. The predictive distribution was fitted with the experimental result，and the general expression of generalized gamma function parameter α was obtained with the different liquid flows. Then，the characteristics and laws of droplet size distribution were summarized through the fitted model. The results show that the fitted model can well predict the number distribution and was not affected by small droplets. With the increase of liquid flow，droplet size distribution range becomes narrow，peak droplet size reduces linearly and the percentage of peak droplet size increases linearly.

Key words: pressure swirl nozzle, atomized droplet size, maximum entropy model