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A Visualization of Combustion Process in a Gasoline HCCI Engine Using Blow-Down Super Charge System
Published May 19, 2010 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Spring Conference
To examine the relation between ignition and the thermal stratification of the gasoline HCCI engine using the blow-down super charge system and EGR guide, combustion process is visualized by using an optical engine, and compared with the calculated results with a temperature distribution by a three-dimensional numerical simulation. The results shows that the ignition is first observed near one of the exhaust valves, and this ignition-region first observed is well agreed with the region of high temperature predicted by the simulation. Furthermore, to clarify the local combustion process, the analysis of the temporal change of local chemiluminescence intensity is performed by changing the size of a local area. As a result, its temporal profile in the case of a whole area looks like that of a heat release rate, and as the area to be averaged becomes small, the profiles of chemiluminescence intensity become almost same. This indicates that it is possible for local BDSC-HCCI combustion to be approximately completed with the same combustion duration, having a different ignition-delay time.