Experimental study of ignition timing and supercharging effects on a gasoline engine fueled with synthetic gases extracted from biogas.
Experimental study of ignition timing and supercharging effects on a gasoline engine fueled with synthetic gases extracted from biogas.
复制标题
DOI：
10.1016/j.enconman.2015.03.061
复制
发表时间：
2015-06
影响因子：
10.4
通讯作者：
J. Arroyo;F. Moreno;M. Muñoz;C. Monné
中科院分区：
文献类型：
--
作者：
J. Arroyo;F. Moreno;M. Muñoz;C. Monné
本文介绍了在火花点火式汽油机上进行的两个系列的试验结果。进行第一组试验是为了分析点火正时在这种气体燃烧中的影响。据发现，取决于气体混合物的组成的最佳点火定时是相当不同的。选择正确的当量比和点火正时可以实现高于汽油的效率。它也被检测到的点火正时的变化有一个重要的影响燃烧参数，如最大压力，燃烧质量分数，放热比和循环不规则性。这种影响被扩展到一些污染物，如HC和NOx，这是强烈的燃烧温度的影响。第二组试验包括通过对进气进行增压来增加进气压力。增压压力的增加涉及空气-燃料混合物的质量流量的增加，因此，发动机性能得到改善。这意味着扭矩和效率提高，在大气条件下达到高于汽油的值。释放的能量的增加意味着更高的最大压力，但燃烧的其他方面不受增压压力的影响。然而，在这些测试中，污染物排放呈现出一些变化，主要是由于发电量的增加和空气燃料混合物流量的变化。
This paper presents the experimental results of two series of tests developed in a gasoline spark ignition engine fueled with synthetic gases obtained from catalytic decomposition of biogas. The first group of tests was carried out in order to analyze the effects of the ignition timing in the combustion of such gases. It was found that depending on the composition of the gaseous blends the optimum ignition timing is quite different. The selection of the right equivalence ratio and spark timing allowed the achievement of efficiencies above the gasoline. It was also detected that the variation in the ignition timing has an important effect on parameters of combustion like maximum pressures, mass fraction burned, heat release ratio and cyclic irregularity. Such effects were extended to some pollutants like HC and NOx, which are strongly influenced by the combustion temperatures. The second group of tests consisted in the increase of the intake pressure over the atmospheric through supercharging the intake air. The increase in the boost pressure involved an increment in the mass flow of air–fuel mixture aspired and consequently, the engine performance improved. This entailed that the torque and the efficiencies raised, reaching values higher than gasoline at atmospheric conditions. The increment in the energy released implied higher maximum pressures, but other aspects of combustion were not influenced by boost pressures. However, pollutant emissions presented some variations in these tests, caused mainly for the increase in the power generated and the changes in the flow of air–fuel mixture.