اثرات احتراق کم دما و تزریق دیزل بر تولید داخل سیلندر هیدروژن در یک موتور احتراق فشرده سوختن

To increase the hydrogen yield further, a post injection timing sweep was carried out with low temperature combustion operation. Increased yields of hydrogen were obtained, up to 0.76% by volume, when then the post injection timing was advanced from 70 to 20° crank angle after top dead centre. At the same time, the indicated NOX emissions reduced to 0.013 g/kW·hr and the smoke emissions were 0.14 FSN. Thus, the tests established that the combination of low temperature combustion, low intake oxygen, and an early post injection produced a high yield of hydrogen with simultaneously ultra-low NOX and smoke emissions. The main drawback of this strategy was the increased formation of methane, up to 3015 ppm by volume. However, further analysis showed that the hydrogen to methane ratio actually increased under low temperature combustion operation.