The effect of thermal stratification on the ignition of a lean homogeneous n-heptane/air mixture at constant volume and high pressure is investigated by direct numerical simulations (DNS) with a new 58species reduced kinetic mechanism developed for very lean mixtures from the detailed LLNL mechanism (H.J. Curran et al., Combust. Flame 129 (2002) 253–280). Two-dimensional DNS are performed in a ...

The relevance of this study is due to the need replace petroleum diesel fuel with motor fuels obtained from alternative raw materials. Rapeseed oil and ethyl alcohol are considered as promising fuels. use these biofuels a makes it possible solve problem reducing carbon dioxide emissions into atmosphere switch carbon-neutral energy. possibility using mixtures for engine considered. Poor flammabi...

As an attempt at providing insight to develop better modeling strategies for HCCI engines, the ignition and propagation of a reaction front in a premixed fuel/air stream mixed with hotter exhaust gases is computationally investigated using the opposed-flow configuration. The effects of heat and radical transport are studied by imposing various mixing rates on the system. The results show that t...

Ignition studies of two C5 esters were performed using a rapid compression facility. Methyl butanoate and ethyl propanoate were chosen to have matching molecular weights and C:H:O ratios while varying the length of the constituent alkyl chains. The effect of functional group size on ignition delay time was investigated using pressure time-histories and high-speed digital imaging. Low-temperatur...

Autoignition of binary blends of n-butanol and n-heptane was studied in a rapid compression machine at an equivalence ratio of 0.4 and a compressed pressure of 20 bar with the compressed temperature varying from 700 K to 907 K. Within the temperature range covered in this study, no cool flame or negative temperature coefficient behavior was observed for neat n-butanol. With the presence of n-he...