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The Influence of Propellant Deterrent Concentration Profile on Interior Ballistics Predictions Using Lumped-Parameter and Multiphase Flow Codes

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Technical Report,01 Jan 2007,01 Apr 2008

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U.S. Army Research Laboratory Aberdeen Proving Ground United States

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Predictions of interior ballistics behavior of guns using simulation codes are highly dependent on the accuracy of the required inputs describing the gun, projectile, and often most difficult, the propellant and related charge characteristics e.g., primer,case, and parasitic components. This problem is only exacerbated with more sophisticated codes requiring data on propellant ignitability and thermal and mechanical properties as well as the standard thermochemical and burning rate data. But even these last two requirements, common to all levels of interior ballistics codes, can be very difficult to meet for propellants with varying compositions, known commonly as deterred propellants. Long used for small arms propellants, deterred propellant concepts for larger-caliber guns are now under development as well. In this report, we examine the influence of two simple but extreme descriptions of deterrent concentration as a function of depth in a variety of granulations and using several levels of interior ballistics codes.

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