Experimental study on spray characteristics under ultra-high injection pressure for DISI engines
Experimental study on spray characteristics under ultra-high injection pressure for DISI engines
复制标题
DISI发动机超高喷射压力喷雾特性实验研究
DOI：
10.1016/j.fuel.2016.08.086
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发表时间：
2016-12
期刊：
影响因子：
7.4
通讯作者：
Zhang Wu
中科院分区：
文献类型：
--
作者：
Tian Jiangping;Zhao Ming;Long Wuqiang;Nishida Keiya;Fujikawa Tatsuya;Zhang Wu
为了全面了解缸内直喷式火花点火发动机超高喷油压力下的汽油喷雾特性，采用激光吸收-散射技术，在非汽化和汽化条件下，同时测量了汽油喷雾的液、汽两相宏观特性，包括喷雾的总体结构、贯穿距离和喷雾角.得到了汽油机瞬态喷雾的贯穿距离经验关联式，并与柴油机喷雾的贯穿距离经验关联式进行了比较。实验结果表明，在非汽化条件下，喷嘴贯穿距离与时间近似成正比。在蒸发条件下，喷雾羽流轴向压缩，径向膨胀;燃料蒸汽集中在喷雾头，而燃料液滴在尾部。汽相喷嘴贯穿度与液相喷嘴贯穿度具有相似的数值和时间变化规律，但有细微的规律性差异。与柴油喷雾相比，汽油喷雾的贯穿距离对环境气体密度的依赖性较大，对喷油器压降的依赖性较小。与液相相比，气相渗透率随时间的增长速率较大，随环境气体温度的下降斜率较小。
In order to provide comprehensive information on gasoline spray characteristics under ultra-high fuel injection pressure for direct-injection spark-ignition engines, the macroscopic characteristics of gasoline sprays for both liquid and vapor phases, including overall spray structures, spray tip penetrations, and spray angles, were determined simultaneously via Laser Absorption-Scattering technique under non-vaporizing and vaporizing conditions. Empirical correlations of spray tip penetration for transient gasoline sprays were obtained and compared with those for diesel sprays. Experimental results showed that under non-vaporizing conditions, spray tip penetration was approximately proportional to time. Under vaporizing conditions, the spray plumes were compressed axially and expanded radially; fuel vapor was concentrated in the spray head, while fuel droplets in the tail. Vapor phase spray tip penetration shared similar values and temporal variations with liquid phase but with a subtle and regular difference. In contrast with diesel sprays, gasoline spray penetration of liquid phase showed larger dependence on ambient gas density and smaller dependence on fuel pressure drop through injector. Compared with liquid phase, vapor phase penetration showed a larger growth rate with time and presented a smaller falling slope against ambient gas temperature.
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DOI：
10.1016/j.ijheatfluidflow.2013.11.005
发表时间：
2014-02-01
影响因子：
2.6
作者：
Lee, Sanghoon;Park, Sungwook
通讯作者：
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DOI：
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发表时间：
2005-05
期刊：
SAE transactions
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发表时间：
2007-07
期刊：
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作者：
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影响因子：
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作者：
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通讯作者：
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DOI：
10.4271/2005-01-0098
发表时间：
2005-04
期刊：
SAE transactions
影响因子：
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作者：
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A. Nauwerck;J. Pfeil;A. Velji;U. Spicher;B. Richter