Cs. Chang et al., MODELING AND SIMULATION OF AUTOIGNITION UNDER SIMULATED DIESEL-ENGINECONDITIONS, Combustion science and technology, 114, 1996, pp. 205-219
Numerical simulations of spray autoignition and flame propagation are
presented in this paper, with emphasis on the chemical reaction aspect
. The mathematical models and the computer code are verified by compar
ing the numerical simulation results with experimental data for a spra
y injected into a cold environment. The turbulent autoignition problem
is that of the injection of liquid fuel into initially stagnant, hot
air at high pressure, i.e., the conditions are similar to those found
in the cylinder of a Diesel engine. Since autoignition is a highly tra
nsient phenomenon, in the modelling a time-like variable, denoted by c
t is introduced to characterize the transient chemical reaction during
the turbulent autoignition process. The model successfully covers the
period from early autoignition to flame propagation. A balance equati
on for the Favre ensemble mean (C) over tilde(+) is derived from basic
principles. The numerical results show good qualitative agreement wit
h experimental data obtained by the Naples (Italy) combustion group.