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Experimental investigation on the spray characteristics of a self-pressurized hollow cone injector
Fuel ( IF 7.4 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.fuel.2020.117710
Hao Wu , Fujun Zhang , Zhenyu Zhang , Hongli Gao

Abstract Influence of ambient pressure on spray characteristics of a special self-pressurized outwardly opening injector was experimentally studied. The experiments were conducted in a constant-volume vessel with the ambient pressure ranging from 5.0 kPa to 600 kPa. Spray characteristics such as spray tip penetration, width and dispersion area under different ambient pressures P a were obtained using image post-processing method. The results reveal that spray pattern shows a “flash-boiling—typical—vortex” hollow cone spray transition corresponding to the non-monotonic spray dispersion area ratio tendency with ambient pressure increasing. Intense spray flash-boiling and resultant drastic morphology changes were observed under ambient pressure of 5.0 kPa and a distinct flash-boiling induced vortex-ring was first observed inner the spray, together with rapid evaporation and finally promoted spray dispersion. Typical hollow cone spray was observed with intermediate ambient pressures between 40 kPa and 200 kPa. Jet-string structure was formed on the surface of typical hollow cone spray due to air disturbance and surface tension of the liquid-sheet jet. When P a > 400 k P a , notable spray induced vortex was formed with enhanced entrainment of the airflow, which contributes to liquid droplet movement therefore again promotes spray dispersion.

中文翻译:

自增压空心锥形喷射器喷雾特性的实验研究

摘要 实验研究了环境压力对特殊自压外开式喷油器喷雾特性的影响。实验在定容容器中进行,环境压力为 5.0 kPa 至 600 kPa。使用图像后处理方法获得了在不同环境压力 P a 下的喷雾特征,例如喷嘴穿透度、宽度和分散面积。结果表明,随着环境压力的增加,喷雾形态呈现出与非单调喷雾分散面积比趋势相对应的“闪沸-典型-涡流”空心锥喷雾转变。在 5.0 kPa 的环境压力下观察到强烈的喷雾闪沸和由此产生的剧烈形态变化,首先在喷雾内部观察到明显的闪沸诱导涡环,连同快速蒸发,最终促进喷雾分散。在 40 kPa 和 200 kPa 之间的中等环境压力下观察到典型的空心锥形喷雾。由于空气扰动和液片射流的表面张力,在典型的空心锥喷雾表面形成了射流结构。当 P a > 400 k P a 时,形成显着的喷雾诱导涡流,气流的夹带增强,这有助于液滴运动,因此再次促进喷雾分散。
更新日期:2020-07-01
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