Experimental Study of Biodiesel Blends’ Effects on Diesel Injection Processes
Experimental Study of Biodiesel Blends’ Effects on Diesel Injection Processes
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DOI：
10.1021/ef801102w
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发表时间：
2009-05
期刊：
影响因子：
5.3
通讯作者：
J. Desantes;R. Payri;Antonio García;J. Manin
中科院分区：
文献类型：
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作者：
J. Desantes;R. Payri;Antonio García;J. Manin
本文采用四冲程直喷式商用柴油机衍生的标准喷射系统，对三种生物柴油混合物的直喷过程进行了实验比较。具体来说，这项工作依赖于在商业柴油燃料上进行的几项实验，其中含有5.75%的油菜甲酯称为B5，另一种含有30%的RME (B30)，以及纯油菜甲酯燃料（称为RME）。在非蒸发条件下，对喷射速度、形状、喷射力、喷嘴穿透度和锥角进行了分析和研究，以比较不同燃料对喷射过程的影响。更好地理解喷射过程将有助于更好地理解压缩点火发动机中决定燃烧和排放的混合过程。众所周知，像密度或运动粘度这样的燃料特性在植物油中更高，并且强烈影响喷射系统的运行方式。在使用生物柴油时，在注射速率测量中观察到液压延迟的增加和更高的质量流量；宏观可视化结果表明，生物柴油燃料的穿透时间略长，锥角较窄，因此喷雾体积较小。
This paper presents an experimental comparison of three biodiesel blends on DI diesel injection process using a standard injection system derived from a 4-stroke DI commercial diesel engine. Specifically, this work relies on several experiments carried out over a commercial diesel fuel, with 5.75% of rape methyl ester called B5, another with 30% of RME (B30), and a pure rape methyl ester fuel (called RME). Analyses on injection rate shape, spray force, spray tip penetration, and cone angle in nonevaporative conditions have been performed and studied to compare the effect of those different fuels over the injection process. A better understanding of injection process will be useful to achieve a better comprehension of mixing process which determines combustion and emissions in a compression ignition engine. It is well-known that fuel properties like density or kinematic viscosity are higher in vegetable oils and strongly affect how injection system operates. An increase in the hydraulic delay and a higher mass flow rate have been observed in injection rate measurements when using biodiesel; macrovisualization showed that the biodiesel fuel has slightly longer penetration and narrower cone angle that leads to smaller spray volumes.