The role of ignition delay time on the deflagration index in a 20l bomb

Deflagration index measurements have been performed in a 20 l sphere for methane/air and methane/nicotinic acid/air mixtures of different compositions at varying ignition delay time and, hence, turbulence level. We modelled the effect of the initial level of turbulence on the deflagration index values through formula for the turbulent burning velocity as function of velocity fluctuation.