The effect of strand size on experimental measurement of solid propellant burning rate augmentation.
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The burning rates of metallized solid propellant strands ranging in cross-section from 1/4 x 1/4 inch to 1 x 1 inch and in length from 1/2 inch to 2 inches were tested at five acceleration levels and three pressure levels to determine the effect of the presence of a rigid inhibitor case on measured burning rate. The investigation showed that sample size did influence the average burning rate but that this effect could be minimized by increasing the cross-sectional area of the propellant strand. The burning rates obtained were compared with data from other test facilities, each set of data utilizing a different technique to investigate the influence of acceleration and pressure on propellant burning rate. By proper selection of strand size, a good correlation of results was possible.
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