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采用数值模拟的方法对一种低压双层雾化器(Double Layer Atomizer)气流场和雾化过程进行了研究,分析了上层雾化器对气流循环区域以及金属液流雾化的影响。结果表明:上层雾化器的引入能有效抑制气流循环区域的不良影响,有利于金属液流的稳定流动;考虑到上层雾化器压力的增大会引起气流循环区域压力的增大以及流量的增加,选择0.15MPa/0.68MPa~0.2MPa/0.68MPa的压力条件较为有利;该双层雾化器液流破碎过程存在一定的类似于紧密耦合式雾化器(Close-Coupled Atomizer)的膜状破碎方式,破碎液滴在空间飞行发散范围和其粒径大小有关。
The numerical simulation was used to study the flow field and atomization process of a double layer atomizer. The influence of the upper atomizer on the circulation area of the gas flow and the atomization of the metal flow were analyzed. The results show that the introduction of the upper atomizer can effectively restrain the adverse effects of the air circulation area and facilitate the steady flow of the metal liquid. Considering the increase of the pressure of the upper atomizer, the pressure in the circulation area increases and the flow rate increases , The pressure conditions of 0.15MPa / 0.68MPa ~ 0.2MPa / 0.68MPa are more favorable. The double-layer atomizer has some similar membrane crushing process similar to Close-Coupled Atomizer Way, broken droplets in the space flight divergence and size of its size.