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ATOMIZATION AND DISTRIBUTION OF DROPLETS IN GAS-LIQUID SPRAYS BY COAXIAL SWIRL INJECTORS
Atomization and Sprays ( IF 1.2 ) Pub Date : 2020-01-01 , DOI: 10.1615/atomizspr.2020033825
Gijeong Jeong , Yeseung Lee , Juntae Yoon , Hyeontaek Jo , Youngbin Yoon

Swirl injectors are widely used in aerospace propulsion systems because they exhibit high mixing and combustion efficiencies of the propellant. Unlike a single liquid injector, a coaxial gas-liquid swirl injector, in which droplet breakup is accelerated by the gas flow, depends on the droplet generation mechanism at the beginning of the mixing process. High-velocity gas flows affect droplets and can atomize them into fine droplets. This can allow the gas swirl injector to have a more direct effect on the liquid film. In this study, two types of gas-liquid coaxial swirl injectors were used in the experiments. The droplet distribution and the formation mechanism of the fine droplets were investigated through the analysis and comparison of the longitudinal-sectional shape of the spray according to the supply conditions of the internal and external mixing injectors. A high-performance laser was used to facilitate the measurement of the vertical sections of the spray, and multiple scattering signals were removed from the image using the double pulse structured laser illumination planar imaging method.

中文翻译:

同轴旋流喷头在气液喷淋中雾化和分布

旋流喷油器由于具有很高的推进剂混合和燃烧效率,因此被广泛用于航空航天推进系统。与单个液体喷射器不同,同轴气液旋流喷射器在混合过程开始时取决于气流产生的液滴,其中气体的流动会加速液滴破碎。高速气流会影响液滴,并使它们雾化成细小液滴。这可以使气体旋流喷射器对液膜具有更直接的作用。在这项研究中,实验中使用了两种类型的气液同轴旋流喷射器。根据内部和外部混合喷射器的供应条件,通过分析和比较喷雾的纵向截面形状,研究了微滴的液滴分布和形成机理。使用高性能激光来方便测量喷雾的垂直截面,并使用双脉冲结构的激光照明平面成像方法从图像中去除了多个散射信号。
更新日期:2020-01-01
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