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Laval喷管作为天然气超音速旋流分离器的核心部件,其几何结构对喷管制冷性能和分离器的分离效率有着决定性影响。文中利用FLUENT软件进行数值模拟,系统研究了Laval喷管渐缩段线型、渐扩段张角及旋流器位置对Laval喷管内压力分布和制冷性能的影响。结果表明:渐缩段线型对喷管制冷性能有较大影响,采用维托辛斯基曲线进行Laval喷管渐缩段的设计可以获得较好的制冷效果;渐扩段张角越大,温降趋势越明显,喷管出口所能获得的温度越低,制冷效果也越好,但随着渐扩段张角的增大,在喷管存在背压的情况下易造成激波前移,破坏喷管内的低温环境;Laval喷管(加旋流器)的旋流分离能力和制冷性能存在着明显的制约关系,需要在二者之间寻找一个平衡点,使得Laval喷管(加旋流器)可以取得较好的旋流效应和膨胀制冷效果。
As a core component of a natural gas supersonic cyclone separator, the Laval nozzle geometry has a decisive influence on nozzle cooling performance and separator separation efficiency. In this paper, the numerical simulation using FLUENT software was carried out to systematically study the influence of Laval nozzle line profile, divergence angle and swirler position on the pressure distribution and cooling performance in Laval nozzle. The results show that the tapered section line has a significant influence on the cooling performance of the nozzle. The design of the tapered section of Laval nozzle with Vytotsinski curve can obtain a better cooling effect. The larger the opening angle is, The more obvious the temperature drop trend, the lower the temperature available at the outlet of the nozzle is, the better the cooling effect is. However, as the divergence angle of the divergent section increases, it is easy to cause the shock wave to advance when there is a back pressure in the nozzle , Destroying the low temperature environment inside the nozzle. There is a clear restriction between the cyclone separation ability of the Laval nozzle (plus the cyclone) and the refrigeration performance. A balance point needs to be found between the Laval nozzle Flow device) can achieve better swirl effect and expansion cooling effect.