Flame Spreading and Combustion Behavior of Gun Propellants Packed in High Loading Densities

Kuo, Kenneth K.; Ferrara, Pete

doi:10.21236/ada426407

Cited by 1 publication

(1 citation statement)

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“…Ignition of propellant bed can be interpreted by two mechanisms [1]: one is the direct or uniform ignition, where the propellant charge is ignited primarily by the efflux of the igniter; another is indirect or flame spreading, where the igniter efflux ignites only a localized region of the charge, and the resultant propellant gasification promotes a convective flow to ignite the remainder of the charge. Historically, many researchers investigated the ignition and flame spreading process in the granular and ball powder propellant [2][3][4][5][6][7][8]. The resultant overpressurization can create large-scale travelling pressure waves that cause propellant grain fracture and projectile impact loads because of motion and redistribution of propellant bed, even catastrophic failures under high loading density propellant charge conditions [9].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Calculation of Initial Ignition Gas Pressure Flow through the Rigid Porous Media in 100 mm Ignition Simulator

Xiao

Ying

et al. 2012

AMR

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To acquire better understanding of the early ignition phenomena in 100mm ignition simulator loaded with packed propellant bed, a theoretical model of ignition gas flow through rigid porous media is developed. Three pressure gauges are installed in the lateral side of ignition simulator for chamber pressure measurements after ignition. The pseupropellant loaded in the chamber is similar to the standard 13/19 single-base cylindrical propellant in size. It is composed of rigid ceramic composite with low thermo conductivity. It is assumed that the pseupropellant bed is rigid in contrast to the previous elastic porous media assumption. The calculated pressure values can be verified by the experimental data well at the low loading density of pseupropellant bed of 0.18 g/cm3. However, there is still error between the experimental and calculated results in the early pressure peak position close to the ignition primer when the loading density of pseupropellant bed increases to 0.73 and 1.06g/cm3, due to the change of local permeability of pseupropellant bed at high loading density, which is assumed a constant in the model for the modeling easily. The calculations can enable better understanding of physical processes of ignition gas flow in the ignition simulator loaded with the pseupropellant bed.

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