Khoa Nguyen Xuan, Lim Ocktaeck
Faculty of Automobile Technology, Hanoi University of Industry, No. 298, Cau Dien Street, Bac Tu Liem District, Hanoi 100000, Vietnam.
School of Mechanical Engineering, University of Ulsan, 93 Daehak-ro, Nam-gu, Ulsan 44610, South Korea.
ACS Omega. 2022 Apr 20;7(17):14505-14515. doi: 10.1021/acsomega.1c05759. eCollection 2022 May 3.
In this research, we estimated and summarized the effects of combustion duration on the performance and emission characteristics of a spark-ignition engine using pure methanol and ethanol as fuels, which have not been previously presented. From the results, we demonstrated that an increase in combustion duration causes a decrease in peak firing temperature and peak firing pressure and an increase in trapped residual gas. The level of trapped residual gas when using ethanol as fuel is higher than that of methanol fuel. The indicated mean effective pressure (IMEP) and brake mean effective pressure (BMEP) increase to maximum values and then decrease with increasing combustion duration, while the brake specific fuel consumption (BSFC) reaches a minimum value and then increases. The optimal BSFC improved to 33.31% when the engine used ethanol fuel instead of methanol. The increase in combustion duration helps to reduce NO and HC emissions, but an increase in CO emissions is observed.
在本研究中，我们估算并总结了燃烧持续时间对以纯甲醇和乙醇为燃料的火花点火式发动机性能及排放特性的影响，此前尚未有相关研究成果发表。从结果来看，我们证明了燃烧持续时间的增加会导致峰值燃烧温度和峰值燃烧压力降低，以及残余废气滞留量增加。以乙醇为燃料时的残余废气滞留量水平高于甲醇燃料。指示平均有效压力（IMEP）和制动平均有效压力（BMEP）随着燃烧持续时间的增加先升高至最大值然后降低，而制动比油耗（BSFC）则先达到最小值然后升高。当发动机使用乙醇燃料而非甲醇时，最佳制动比油耗提高到了33.31%。燃烧持续时间的增加有助于减少氮氧化物和碳氢化合物排放，但一氧化碳排放有所增加。
