Accession Number : ADA018135

Title :   Parametric Sensitivity Study of a Numerical Model for Flame Spreading.

Descriptive Note : Final rept.,


Personal Author(s) : Kitchens,Clarence W. , Jr

Report Date : OCT 1975

Pagination or Media Count : 31

Abstract : A sensitivity study is performed to identify critical input assumptions in a numerical model for flame spreading. This model is applied to predict flame spreading phenomena in a bed of small arms ball propellant. The numerical results are compared with experimental pressure measurements taken in 5.85 and 10.84 cm long venting chambers. The predicted flame spreading rate is approximately three times slower than is indicated in the experiments. The sensitivity calculations identify the relative importance of assumptions about the average particle size, ignition criteria, drag correlation, heat transfer correlation, compaction distance, porosity distribution, and burning rate. The compaction distance and initial porosity distribution are identified as important parameters in this model. It appears that a two-phase flow model is required for more realistic flame spreading simulations. (Author)

Descriptors :   *Flame propagation, *Ammunition propellants, Ball projectiles, Small arms ammunition, Sensitivity, Computations, Mathematical models, Mathematical prediction, Experimental data, Pressure, Measurement, Chambers, Test facilities, Velocity, Rates, Ignition, Burning rate, Equations, Reynolds number, Correlation techniques, Time studies, Primers, Blast, Compressible flow, Porosity, Distribution, Heat transfer, Particle size, Fluid dynamics, Drag, Compacting, Short range(Distance), Two phase flow

Subject Categories : Ammunition and Explosives
      Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE