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Abstract
This paper presents a computational study of spray autoignition under conditions similar to those found in Diesel engines. Specifically, liquid n-heptane is injected into a quiescent, hot, high-pressure environment of air. A hybrid approach to the simulation of this problem is adopted, where the Favre-averaged gasphase equations governing conservation of overall mass, momentum and turbulence are discretised using a finite-volume method. The statistics of the two-phase flow are described by a marginal gasphase pdf for a mixture fraction and a reaction-progress variable, which obeys the scalar pdf-transport equation usually used to model purely gaseous turbulent flames, and a marginal liquid-phase pdf, the so-called “spray equation”
The Eulerian gasphase conservation equations are solved by a predictor-corrector pressure-implicit method to provide quantitative information concerning the evolving mean turbulent flow field. The transport equation of the gasphase-scaler joint-pdf is solved using a Monte Carlo method. The spray equation is solved using a Lagrangian formulaiton in conjunction with another Monte Carlo method
Good agreement is found between the results predicted herein and experimental data reported in the literature.
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