Performance and emission evaluation of a small-bore biodiesel compression-ignition engine
Performance and emission evaluation of a small-bore biodiesel compression-ignition engine
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DOI：
10.1016/j.energy.2019.07.015
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发表时间：
2019-09
期刊：
影响因子：
9
通讯作者：
Felix Sebastian Hirner;Joonsik Hwang;C. Bae;C. Patel;T. Gupta;A. Agarwal
中科院分区：
文献类型：
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作者：
Felix Sebastian Hirner;Joonsik Hwang;C. Bae;C. Patel;T. Gupta;A. Agarwal
研究了在小缸径共轨单缸柴油机上添加生物柴油对燃烧和排放特性的影响。发动机实验使用废食用油（WCO）、麻风树油和卡兰贾油衍生的生物柴油进行。使用常规柴油作为基准燃料。试验发动机在1200 rpm的速度和0.5 MPa的指示平均有效压力下运行。在40、80和120 MPa的燃料喷射压力（FIP）下喷射燃料。与此同时，燃油喷射正时从上止点（aTDC）后的−15曲柄角度（CAD）变化到−3 CAD aTDC。实验结果表明，着火延迟期与十六烷值直接相关，且在较高的着火点处影响更为显著。随着喷油提前角的增大，缸内压力峰值增大，这是由于点火延迟期增大。与传统柴油相比，生物柴油的氮氧化物排放量相对较低或相同。这主要是由于较低的燃烧效率，显示出大量的烟雾，HC和CO的排放量从不完全燃烧。然而，对于WCO生物柴油，烟度，HC和CO排放可以显着改善比其他生物柴油由于更好的雾化和空气燃料混合过程。
This study investigates the influence of biodiesels on combustion and emission characteristics in a common-rail equipped small-bore single-cylinder diesel engine. The engine experiments were performed using waste-cooking-oil (WCO), Jatropha-oil, and Karanja-oil derived biodiesels. Conventional diesel was utilized as a baseline fuel. The test engine was operated at a speed of 1200 rpm and an indicated mean effective pressure of 0.5 MPa. The fuels were injected at fuel injection pressures (FIPs) of 40, 80, and 120 MPa. At the same time, the fuel injection timing was varied from −15 crank angle degrees (CAD) after top dead center (aTDC) to −3 CAD aTDC. Experimental results showed that ignition delay was directly correlated to the cetane number and had more significant effect at higher FIPs. The peak of in-cylinder pressure increased as the injection timing was advanced, due to longer ignition delay. Biodiesels showed relatively lower or equal level of nitrogen oxides (NOx) emissions compared to conventional diesel. This was mainly due to lower combustion efficiency showing high amount of smoke, HC, and CO emissions from incomplete combustion. However, for the WCO biodiesel, smoke, HC, and CO emissions could be significantly improved than other biodiesel thanks to better atomization and air-fuel mixing process.