DNS Investigation on Autoignition and Flame Propagation in HCCI Combustion

DNS Investigation on Autoignition and Flame Propagation in HCCI Combustion

Blog Article

2-dimensional direct numerical simulation (DNS) of autoignition and flame propagation of turbulent premixed mixture has been conducted to investigate the turbulent combustion mechanism in homogeneous charge compression ignition (HCCI) engines.CH4-air mixtures with spatial inhomogeneity of temperature and equivalence ROMPERS ratio are investigated by considering a detailed kinetic mechanism.Since the combustion process depends on local characteristics of the mixture, an identification method of ignition or flame propagation is proposed based on behaviors of elementary reactions related to OH Bullet Tumbler radical.The proposed identification method shows that the area fraction of the flame propagation region increases drastically with the increase of initial temperature fluctuations.