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Abstract
A simplified model has been developed for the flame-spreading over the surface of the flat double-base propellant in the turbulent boundary layer which was experimentally studied in Part I. The model is based on the heat transfer from the gas-phase to the solid-phase and a critical temperature ignition criterion. The flow during flame-spreading was simulated by the flow in the turbulent boundary layer with blowing in the present model and the heat transfer with blowing has been experimentally studied. The blowing effect of burned gas on the heat transfer coefficient is found to be important for the flame-spreading in the boundary layer. The flame-spreading distance and the distribution of the unburned surface temperatures were predicted by the present model. In addition, the secondary ignition, which occurred in the unburned region downstream far from the flame front, was predicted for a low main stream velocity by the present model. The results were in good agreement with the experimental results.