A model of solid-propellant burning is postulated, in which the complex chemical-reaction and heat-conduction problem in the gas phase is replaced by a simplified boundary condition which assumes convective heat transfer to the surface from a parallel flow of gas at flame temperature. The effective heat-transfer coefficient is assumed to be an inverse function of propellant burning rate, which in turn is assumed to be an Arrhenius function of the surface temperature. The model permits calculation of steady-state surface temperatures, burning rates, and temperature gradients which show the proper qualita- tive dependence upon the propellant and gas-flow parameters and which, for the assumed values of these parameters, appear to be of the proper order of magnitude.
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