Abstract
Measurements of ignition delay and other combustion phenomena were made on a single-cylinder, open-chamber, supercharged research diesel engine. The influence of engine speed, fuel/air ratio, and air-charge pressure are reported. The results show that the elapsed time from the start of injection until illumination occurs is longer than that for pressure rise due to combustion. As expected, the measured ignition delay is decreased with increased speed. However, when a correction was made for cylinder air temperature change due to speed, the ignition delay increased with speed. Increase in the fuel/air ratio decreased the measured ignition delay. However, when corrected, the ignition delay was unaffected by fuel/air ratio. The smoke increased with engine speed and fuel/air ratio.
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