Three Dimensional Modeling of Combustion and Soot Formation in an Indirect Injection Diesel Engine

Abstract

<div class="htmlview paragraph">The three dimensional computer code KIVA is applied to calculate combustion in an IDI Diesel engine.</div> <div class="htmlview paragraph">The ignition delay is described by a four step kinetics model involving a generalized radical.</div> <div class="htmlview paragraph">The high temperature combustion phase is computed using a model due to Magnussen.</div> <div class="htmlview paragraph">The model of soot formation is due to Tesner.</div> <div class="htmlview paragraph">Finally, an extension of Magnussen' s combustion model allows one to describe soot formation in a turbulent environment.</div> <div class="htmlview paragraph">In the present computations, a classical k-ε turbulence model and the associated laws of the wall are incorporated.</div> <div class="htmlview paragraph">Comparisons between computational and experimental results are emphasized.</div> <div class="htmlview paragraph">The results under four engine operating conditions are found to be encouraging and give hope for the code being predictive soon. However, such aspects as e.g validation of the heat tansfer calculation at the walls and nitric oxide formation have not been taken into account thus far.</div>