“…A few reasonable theories describe some ''simple'' situations such as the isotropic stable propagation of thin flame in a spherical closed vessel with a central ignition (Bradley & Mitcheson, 1978;Evans, 1994 Garforth, 1980) and have been used successfully. If S c is the burning velocity (laminar/turbulent), R is the radius of the vessel, P 0 is the initial pressure (at the ignition time), it can be shown that (g is the ratio of the specific heat capacities):…”