BURNING VELOCITIES OF RICH H-2-O-2 FLAMES UNDER CRYOGENIC CONDITIONS

The burning velocities of rich hydrogen-oxygen mixtures at atmospheric pressure have been studied experimentally as a function of the equiva lence ratio phi and the initial temperature T-0 in the range 1 less th an or equal to phi less than or equal to 5.05 and 120 K less than or e qual to T-0 less than or equal to 300 K, respectively. A conical flame is stabilized at the exit of a cylindrical tube (Bunsen-type burner) and the burning velocity is determined by Gouy's method as the ratio b etween the volumetric flow rate at the exit of the burner and the tota l flame area. The latter is assumed to be that derived from the flame Schlieren photograph. A systematic analysis of the results describes t he burning velocity as a function of the equivalence ratio and of both unburned gas and adiabatic combustion temperatures in the range of th e low unburned gas temperatures. A unique value of the activation ener gy E summarizes the sensitivity of the mass burning rate to the combus tion temperature, whatever the equivalence ratio. The analysis involve s comparisons with other experimental and numerical work. (C) 1997 by The Combustion Institute.