Numerical study on fuel physical effects on the split injection processes on a common rail injection system
Numerical study on fuel physical effects on the split injection processes on a common rail injection system
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共轨喷射系统分流喷射过程中燃料物理效应的数值研究
DOI：
10.1016/j.enconman.2016.12.026
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发表时间：
2017-02
影响因子：
10.4
通讯作者：
Zhen Huang
中科院分区：
文献类型：
--
作者：
Ke Li;Yaozong Duan;He Lin;Zhen Huang
由于生物柴油可作为柴油机的代用燃料，燃料物理性质的变化会影响其喷射特性。在这项研究中，建立了一个一维的水力模型，以确定燃料的密度，粘度和体积压缩模量的隔离效果，对喷射质量和压力传播波的分流喷射策略的共轨喷射系统。数值模拟结果表明，燃油密度和体积压缩模量对主喷射过程中喷油量和喷油器入口压力波动特性的影响较为显著，而燃油粘度的影响较小。此外，预喷射和主喷射之间的喷射停留时间也是影响主喷射事件的喷射特性的关键参数，因为喷射停留时间的长度影响主喷射阶段开始时的初始压力和主喷射阶段的平均压力。这些压力的变化最终影响主喷射事件中的喷射质量。因此，燃料物理性质对主喷射过程的具体影响取决于喷射停留时间，即特定的分段喷射策略。
As biodiesel can be used as an alternative fuel for diesel engines, the changed fuel physical properties are found to have influences on the injection characteristics. In this study, a one-dimensional hydraulic model was established to identify the isolated effect of fuel density, viscosity and bulk modulus of compressibility, on the injection mass and pressure propagation waves of a split injection strategy on a common rail injection system. The numerical simulation results indicated that fuel density and bulk modulus of compressibility have more prominent influences on the fuel injection mass and pressure fluctuation characteristics at the injector inlet during the main injection event, while fuel viscosity effects are modest. In addition, injection dwell time between the pilot and main injection is also a crucial parameter affecting the injection characteristics of the main injection event, because the lengths of the injection dwell time influence the initial pressures at the start of the main injection stage and the mean pressures of the main injection stage. The change in these pressures finally affects the injection mass in the main injection event. Therefore, specific effects of fuel physical properties on the main injection process are subject to the injection dwell time, i.e. the specific split injection strategy.
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