喷雾式防火分隔水幕稳定性仿真

Simulation research on stability of fireproof spray curtain

以单个喷雾式水幕喷头为研究对象,利用Fluent中离散相模型对不同压力下的喷雾水幕的工作稳定性进行了研究,计算了不同工作压力下水雾粒子的粒径分布和在气流作用下的偏移情况,分析了不同粒径粒子的速度衰减特性。研究表明:环境气流对水幕的稳定性影响很大,特别是粒径在200μm以下的水雾粒子极容易受气流影响。在一定空间高度下,提高工作压力,可以使喷雾平均粒径变小,使之分布更均匀,有利于提高水幕的隔热性能;当空间高度超过一定范围后,水雾粒子速度急剧下降,增加工作压力水幕稳定性会降低。

The investigation into the stability of a spray curtain atomizer is based on the discrete phase model （DPM） of Fluent. The spray particle size distribution under different pressures and the deformation caused by airflow are calculated, and the particle velocity attenuation characteristics of different diameters are also analyzed. Studies show that the stability of spray curtain is affected greatly by airflow, especially the particle of diameter size under 200μm, that increasing working pressure at a certain height can make the mean diameter of spray particles smaller and the size distribution more uniform, which will improve the heat-shielding performance of spray curtain and that when the height exceeds a certain range, the water spray particle velocity will decrease so sharply as to reduce the sta- bility while pressure increases.