刘昌文,李强,刘丰年,等.气体喷射及环境背压对空气辅助喷雾特性影响研究[J].内燃机工程,2021,42(3):1-7.
气体喷射及环境背压对空气辅助喷雾特性影响研究
The influence of gas jet and ambient pressure on the characteristics of air-assisted spray
DOI：10.13949/j.cnki.nrjgc.2021.03.001
关键词:航空煤油  空气辅助喷射  贯穿距  喷雾特性  喷雾形态
Key Words:aviation kerosene  air-assisted injection  penetration  spray characteristics  spray shape
基金项目:装备预研基金重点项目（6140311040101）
作者单位E-mail
刘昌文 天津大学内燃机燃烧学国家重点实验室 liuchangwen@tju.edu.cn 
李强 天津大学内燃机燃烧学国家重点实验室  
刘丰年 天津大学内燃机燃烧学国家重点实验室  
华剑雄 天津大学内燃机燃烧学国家重点实验室  
周磊* 天津大学内燃机燃烧学国家重点实验室 lei.zhou@tju.edu.cn 
卫海桥 天津大学内燃机燃烧学国家重点实验室  
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摘要:为了解不同气体参数及环境背压对空气辅助喷雾特性的影响，主要通过定容弹试验平台，采用高速摄影技术分析不同喷气脉宽、不同喷气压力、不同环境背压对于空气辅助喷雾特性的影响，尤其是喷雾宏观形态的变化，并对贯穿距、喷雾投影面积等喷雾特性参数进行定性分析。试验结果表明，在不同试验条件下贯穿距呈两阶段发展趋势，喷雾投影面积线性增长。增加喷气压力或减小环境背压均有助于提高贯穿距和喷雾投影面积，但喷气脉宽对于贯穿距和喷雾投影面积并无影响。不同喷气压力及喷气脉宽喷雾形态大致相同，仅存在微小差异，喷雾形态受环境背压影响较大，在低背压时为粗大的“梭状”形态，在高背压时则呈现“锚钩状”和“锥形”。随着环境背压的增加喷雾稀薄区域开始逐渐降低，并在高背压情况下逐渐消失，喷雾主要集中在核心区域。
Abstract:In order to research the influence of different gas parameters and ambient pressure on air-assisted spray. In this study, spray characteristics was investigated under various air duration, air pressure and ambient pressure in a constant volume vessel by high-speed photography, with specifically interest in macroscopic spray characteristics. Penetration and spray area was used to quantitative analysis spray characteristics. Under different test conditions the results show that two-stage development of air-assisted spray penetration is observed and the spray area exhibit linear increase. Increase air pressure or decrease ambient pressure is beneficial to enhance the spray penetration and spray area, while air duration has little influence on penetration and spray area. The spray shape of different air pressure and air duration were almost the same, with only slight difference. However spray shape is greatly affected by ambient pressure, at low ambient pressure, the spray shape is a "spindle" shaped, while at high ambient pressure, it presents an "anchor hook" shape and a "cone" shape. With the increase of ambient pressure, the thin region of spray began to decrease gradually and disappeared, under high ambient pressure the spray is mainly the core region.
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