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Control of Heat Release Rate in Premixed Compression Ignition Combustion (First Report)~Effect of Injection Pressure and Nozzle Orifice Diameter on Mixture Formation
Published October 01, 2007 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Autumn Conference
The effect of temporal transition in mixture concentration distribution on premixed compression ignition (PCI) combustion with injection timing close to top dead center has been investigated by a single-cylinder engine test and a multi-dimensional CFD simulation using KIVA/CHEMKIN code. The test fuel was a commercial JIS#2 diesel fuel. It was found that the temporal and spatial distribution of fuel vapor concentration varies greatly with injection pressure and nozzle orifice diameter, which brings a significant change to the maximum pressure-rise rate in PCI combustion. The pressure-rise rate is extremely reduced in the case where fuel-rich mixture, leading to soot formation, is still alive at the time of start of combustion and the mixture concentration distribution changes slowly till the peak heat release rate.