Experimental study on injection characteristics of fatty acid esters on a diesel engine common rail system
Experimental study on injection characteristics of fatty acid esters on a diesel engine common rail system
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柴油机共轨系统脂肪酸酯喷射特性实验研究
DOI：
10.1016/j.fuel.2014.01.048
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发表时间：
2014-05
期刊：
影响因子：
7.4
通讯作者：
Zhen Huang
中科院分区：
文献类型：
--
作者：
Yaozong Duan;Chunhai Wang;He Lin;Zhen Huang
研究了三种脂肪酸酯（月桂酸甲酯、油酸甲酯和油酸乙酯）在高压共轨喷射系统上的喷射过程，并与柴油进行了比较。在不同的喷射压力和注入时间范围内，研究了喷射过程中和喷射后的循环喷射速度、循环喷射量和喷油器入口压力波动。在体积喷射速率曲线上，试验脂肪酸酯在喷射开始时的上升斜率较平缓，在稳定喷射阶段的喷射速率较低，但各试验燃料的质量喷射速率比较接近。脂肪酸酯比柴油有更长的喷射延迟；而注射压力的增加会减少注射延迟，但会延长注射时间。喷油器通电时间对喷油速率曲线形状和喷油器入口压力波动有显著影响。针阀关闭后，油酸甲酯和油酸乙酯的压力振荡衰减更快，因为它们的密度、粘度和体积压缩模量都很高。
The injection processes of three fatty acid esters (methyl laurate, methyl oleate and ethyl oleate) are investigated on a high pressure common rail injection system and compared to that of diesel fuel. The cycle injection rate, cycle injection quantity and pressure fluctuation at the injector inlet during and after the injection event are studied across a range of injection pressure and injector energizing time. Test fatty acid esters show smoother rising slopes at the start of injection and lower injection rates at the stable injection period in the volumetric injection rate curves, but the mass injection rates among all test fuels are quite close. Fatty acid esters have longer injection delay than diesel fuel; while increased injection pressure causes reduced injection delay but prolonged injection duration. Injector energizing time significantly influences the shape of injection rate curve and the pressure fluctuation at the injector inlet. After the needle valve closure, pressure oscillation damps more rapidly for methyl oleate and ethyl oleate, due to their high density, viscosity and bulk modulus of compressibility.
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