Influence of injection timing on the exhaust emissions of a dual-fuel CI engine
Influence of injection timing on the exhaust emissions of a dual-fuel CI engine
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DOI：
10.1016/j.renene.2007.07.007
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发表时间：
2008-06
期刊：
影响因子：
8.7
通讯作者：
C. Sayın;Kadir Uslu;M. Çanakçı
中科院分区：
文献类型：
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作者：
C. Sayın;Kadir Uslu;M. Çanakçı
环境问题和有限量的石油燃料已经引起了人们对开发用于内燃机（IC）的替代燃料的兴趣。乙醇作为一种可替代的、可生物降解的和可再生的燃料，正受到越来越多的关注。因此，本文在一台单缸四冲程直喷式自然吸气柴油机上，以乙醇掺混量为0%~ 15%（增量为5%），试验研究了喷油提前角对柴油机排放的影响。发动机的原始喷油正时为27° CA BTDC。通过改变提前垫片的厚度，在五种不同的喷射正时（21°、24°、27°、30°和33° CA BTDC）下进行试验。试验结果表明，随着乙醇掺量的增加，NOx和CO2排放增加，CO和HC排放降低。与原始喷射正时的结果相比，在所有试验条件下，在延迟喷射正时（21°和24° CA BTDC）下，NOx和CO2排放增加，未燃HC和CO排放降低。另一方面，对于所有试验条件，提前喷射正时（30°和33° CA BTDC），HC和CO排放减少，NOx和CO2排放增加。
Environmental concerns and limited amount of petroleum fuels have caused interests in the development of alternative fuels for internal combustion (IC) engines. As an alternative, biodegradable, and renewable fuel, ethanol is receiving increasing attention. Therefore, in this study, influence of injection timing on the exhaust emission of a single cylinder, four stroke, direct injection, naturally aspirated diesel engine has been experimentally investigated using ethanol blended diesel fuel from 0% to 15% with an increment of 5%. The engine has an original injection timing 27° CA BTDC. The tests were performed at five different injection timings (21°, 24°, 27°, 30°, and 33° CA BTDC) by changing the thickness of advance shim. The experimental test results showed that NOxand CO2emissions increased as CO and HC emissions decreased with increasing amount of ethanol in the fuel mixture. When compared to the results of original injection timing, at the retarded injection timings (21° and 24° CA BTDC), NOxand CO2emissions increased, and unburned HC and CO emissions decreased for all test conditions. On the other hand, with the advanced injection timings (30° and 33° CA BTDC), HC and CO emissions diminished, and NOxand CO2emissions boosted for all test conditions.