Exhaust Emissions and Combustion Characteristics of a Direct Injection (DI) Diesel Engine Fueled with Methanol-Diesel Fuel Blends at Different Injection Timings
Exhaust Emissions and Combustion Characteristics of a Direct Injection (DI) Diesel Engine Fueled with Methanol-Diesel Fuel Blends at Different Injection Timings
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DOI：
10.1021/ef800398r
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发表时间：
2008-11-01
期刊：
影响因子：
5.3
通讯作者：
Gumus, Metin
中科院分区：
文献类型：
--
作者：
Canakci, Mustafa;Sayin, Cenk;Gumus, Metin
近年来，环境问题和石油资源的枯竭迫使研究人员集中精力寻找传统石油燃料的可再生替代品。因此，乙醇作为柴油发动机的可再生能源和替代能源变得越来越重要。为此，本研究对单缸柴油机在甲醇混合柴油用量为0 - 15%、增量为5%的情况下，在不同喷油时的性能、废气排放和燃烧特性进行了实验研究。通过改变垫片的厚度，在三种不同的注入时间（15度、20度和25度CA上止点）下进行了测试。所有测试均在4种不同负载（5、10、15和20 Nm）下进行，发动机转速恒定为2200 rpm。实验测试结果表明，随着混合燃料中甲醇添加量的增加，BSFC、BSEC、燃烧效率、NOx和CO2排放量均随着BTE、放热速率、缸顶压力、烟数、CO和UHC排放量的降低而增加。与原始喷油时间（CA为20度）相比，延迟喷油时间（CA为15度）下的峰值缸压、放热速率、燃烧效率、NOx和CO2排放量均有所降低，而烟气数、UHC和CO排放量均有所增加。另一方面，在所有测试条件下，提前喷射正时（25°CA BTDC）、烟数、UHC和CO排放量均有所降低，峰值气缸压力、放热速率、燃烧效率、NOx和CO2排放量均有所增加。就BSFC、BSEC和BTE而言，与原始喷射时间相比，延迟和提前喷射时间在所有燃料混合物中都产生了负面结果。
In the recent years, environmental concerns and depletion in petroleum resources have forced researchers to concentrate on finding renewable alternatives to conventional petroleum fuels. Therefore, alcohols as renewable and alternative energy sources for the diesel engines gain importance. For this reason, in this study, the performance, exhaust emissions, and combustion characteristics of a single cylinder diesel engine have been experimentally investigated under different injection timings when methanol-blended diesel fuel was used from 0 to 15%, with an increment of 5%. The tests were conducted at three different injection timings (15 degrees, 20 degrees, and 25 degrees CA BTDC) by changing the thickness of advance shim. All tests were conducted at four different loads (5, 10, 15, and 20 Nm) at constant engine speed of 2200 rpm. The experimental test results showed that BSFC, BSEC, combustion efficiency, and NOx and CO2 emissions increased as BTE, rate of heat release, peak cylinder pressure, smoke number, and CO and UHC emissions decreased with an increasing amount of methanol in the fuel blend. In comparison to the values at the original injection timing (20 degrees CA BTDC), the values at the retarded injection timing (15 degrees CA BTDC) of peak cylinder pressure, rate of heat release, combustion efficiency, and NOx and CO2 emissions decreased, while smoke number and UHC and CO emissions increased at all test conditions. On the other hand, The advanced injection timing (25 degrees CA BTDC), smoke number, and UHC and CO emissions diminished and peak cylinder pressure, rate of heat release, combustion efficiency, and NOx and CO2 emissions increased at all test conditions. In terms of BSFC, BSEC, and BTE, retarded and advanced injection timings gave negative results in all fuel blends compared to original injection timing.