Experimental study on the combustion phenomenon of catalyzed modified solid propellants

Using Π micro thermalcouple, copper stage guenched sample, SEM, flame color photography technics, we had studied combustion phenomenon for typical modified double base propellants. From the results we have put forward a hypothesis that the bubbles stretched from the combustion catalyst could enhance solid heat release, which results in superburning at low pressures, and the foam layer would be unburned propellant residuals resulted from bubbles. Using a numerical calculation method for analyzing combustion wave structure of solid rocket propellants, we can get the detail information of chemical reactions in the condensed phase. There would be no condensed-gas interface, and the surface temperature would be no meaning. The results show that there would be multi-stage reaction mechanism in solid phase and that the reaction mechanism would be the same in condensed phase at different pressures, only the reaction heat release value would be different.