As a new type of separation device, supersonic separator has received more and more attention in many areas. However, the interaction between boundary layer and shock wave in supersonic section results in the reverse pressure gradient and makes the boundary layer thicken, which form a so-called "second throat" that reduces the actual flow area and causes the fluid to be chocked. A novel cylinder drainage structure with larger drainage area was developed. When shock wave occurs, the high pressure will make more fluid enter into the openings on cylinder drainage structure, which is equivalent to increase the flow capacity. Therefore, the shock wave is weakened and the total pressure loss is reduced. Moreover, the prediction model of discrete phase coupling verified by experiments was adopted in order to predict the trajectory of droplets and separation efficiency for supersonic separator. The results show that with the increase of droplet size, the separation efficiency increases gradually and the particle diameter of 2–4 μm is sensitive to the separation. The droplets trajectory is more clear and regular in the nozzle with reflux channel and cylindrical drainage structure.

作为一种新型的分离装置，超音速分离器在许多领域受到越来越多的关注。然而，在超音速部分中边界层和冲击波之间的相互作用导致反向压力梯度并使边界层变厚，这形成了所谓的“第二喉道”，该“第二喉道”减小了实际流动面积并使流体阻塞。开发了一种新型的排水面积大的圆柱排水结构。当发生冲击波时，高压会使更多的流体进入气缸排水结构的开口，这相当于增加了流量。因此，冲击波被削弱并且总压力损失减小。此外，通过实验验证了离散相耦合的预测模型，以预测超音速分离器的液滴轨迹和分离效率。结果表明，随着液滴尺寸的增加，分离效率逐渐提高，并且2–4μm的粒径对分离敏感。带有回流通道和圆柱形排水结构的喷嘴中的液滴轨迹更加清晰和规则。