PRESSURE-COEFFICIENT TRENDS FOR MIXED PROPELLANTS

Spline fitting has been used in processing measurements on the pressur e dependence of the burning rate to obtain additional information on t he variation in the pressure coefficient nu as affected by grain size and composition, as well as by the nature of the components. Conclusio ns are drawn on the burning mechanism. The peak on nu(p) is due to ser ial-parallel conversion of APC in the condensed and gas phases and to changes in the relative significance of the chemical stages. There is a minimum at elevated pressures for many propellants, which in some ca ses is transformed into a plateau or inflection on account of interact ion between the fuel and the oxidizing agent in the diffusion-kinetic hydrocarbon flame.