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Combustion radicals observation of DME diesel engine by spectroscopic method
Published October 23, 2001 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Autumn Conference
For better understanding the in-cylinder combustion characteristics of DME, combustion radicals of direct injection DME diesel engine were taken by spectroscopic method. In this experiment, the first emission intensity of OH, CH, CHO, C2 and NO radicals were measured using photomultiplier. OH and CHO radicals appeared first, and then CH radical was emitted. Then the combustion radicals were tried to observe used high-speed video camera. C2 and CH were able to observe roughly as figures. However, the emission intensity of DME combustion was not strong enough to take other radicals of OH, CHO and NO. During C2 radical, the combustion intensity was strong near the outer edge of spray, moreover the combustion radical remained at the injector tip until the end of combustion. In case of CH radical, the combustion occurred near the chamber wall and burned like a ling with advancing combustion. It is also important to observe other combustion radicals such as OH, CHO and NO of the DME engine. Therefore, in near future we are going to take those radicals by using band pass filters.