Abstract
In this work, attention is paid on initiation and HCCI combustion control through fuel formulation. This article shows the effect of olefin addition (and in particular 1-octene and octa-1,7-diene addition) in a Diesel base fuel. Tests are made with a jet-stirred reactor and an engine bench. The current Diesel fuel cetane numbers are not really adapted for a perfect control of HCCI combustion. In HCCI conditions, the autoignition of a Diesel fuel occurs too early in the cycle. This study shows that, with the jet-stirred reactor, 1-octene addition allows decreasing the advancement of the cool flame reaction of n-octane. Engine bench experiments show that, at 1500 rpm, 1-octene and octa-1,7-diene addition decrease the physical delay and increase the chemical auto-ignition delay of the Diesel base fuel. These results can be explained by olefin chemistry: olefin double bonds imply reactions (with radicals) that are in competition with the cool flame reactions. There is also the fact that the intermediate species are stabilised by mesomery. About pollutants, olefin addition decreases HC emissions of the Diesel base fuel. Adding light olefins in a Diesel base fuel could improving the HCCI combustion.
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