A Quasi-1D Model for the Description of ECN Spray a Combustion Process

Abstract

<div class="section abstract"><div class="htmlview paragraph">An existing one-dimensional (1D) spray model, which successfully captures inert spray processes, has been extended to enable prediction of ignition delay and lift-off length under reacting conditions. For that purpose, an additional transport equation for the progress variable has been incorporated, which includes detailed chemistry effects by means of a tabulation method based upon an external flamelet solver. The transport equation for the progress variable is solved in a quasi-1D fashion, along presumed mixture fraction trajectories, while the 1D approach is retained for the mixture fraction and axial velocity fields.</div><div class="htmlview paragraph">The paper includes the model development, as well as the validation against Spray A measurements from the Engine Combustion Network. In spite of the simplified approach, the model captures some of the experimental trends of the lift-off length and ignition delay with a quite low computational cost. The approach reinforces the hypothesis of lift-off stabilization due to autoignition process. It also provides an explicit link between the chemical mechanism and the spray ignition and lift-off phenomena.</div></div>