| An attempt has been made to study the time resolved soot particulates in a diesel spray combustion. A new laboratory combustor was developed by simulating the following two essential characteristics of diesel spray combustion: intermittency and autoignition. The combustor is designed so that the fuel is injected by using a diesel fuel injection system into a steadily flowing high temperature air stream resulting in autoignition and combustion. Soot particulates were collected at different stages of combustion by applying an inert gas quenching technique. The mass concentration of soot particulates, diameter, number, and carbon to hydrogen ratio of soot particles in the flame as a function of time from the start of fuel injection were obtained. The effects of fuel properties on soot particulates in the flame were also obtained.; The experimental results indicated that this new technique is a useful tool to obtain the time resolved characteristics of soot particulates in diesel spray combustion. The mass concentration of soot particulates increases during the early stages of combustion, reaches a maximum, after which it decreases near the end of the combustion process. The diameter and carbon to hydrogen ratio of the soot particles increase with time while their number decreases. Adding alcohol, indolene and water to diesel fuel has a definite effect on reducing the soot particulates in the flame.; The theoretical analysis indicated that the time resolved concentration of soot particulates is very sensitive to the flame temperature. |
