Modeling Pressure Response of HMX Including a Condensed Phase Void Fraction

A numerical model of unsteady solid monopropellant combustion has been developed. This model differs from previous work by allowing the calculation of a void fraction in the condensed phase. The gas phase calculation is simplified by assuming that the oscillating pressure influences the condensed phase only by way of an oscillating heat feedback, from the gas phase to the condensed phase, with the same frequency as that of the pressure and a constant amplitude for a given pressure. The simplified gas phase allows for a substantial decrease in the required CPU time and yields the opportunity to investigate the condensed phase parameters such as void fraction and heat release. The model was used to simulate the burning rate responses of HMX to oscillating pressure. Results compare reasonably well with available experimental response data either from directly obtained data or from a ZN calculation solely based on experiment results. Modeling results show that the void fraction in the condensed phase has a very significant influence on the pressuredriven responses of HMX.

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