“…Visual observations by Ellis (1928) and Hu, Pu, Jia, and Jarosinski (2005), as well as pressure-time traces (Pu, 1987;Pu et al, 2000Pu et al, , 1990Pu et al, , 1988Pu et al, , 1993 and direct wall heat transfer measurements (Pu, 1987), suggest that combustion process in closed vessels can be divided into two subprocesses: an initial adiabatic process, followed by a nonadiabatic process. The thermodynamic analysis used to determine the value of the maximum effective burning velocity by Eq.…”