ACOUSTIC WAVE-BURNING ZONE INTERACTION IN SOLID PROPELLANTS
Quarterly progress rept. no. 3, 1 Jan-31 Mar 1962
AEROCHEM RESEARCH LABS INC PRINCETON NJ
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Installation of guard rings of burning propellant around a burning propellant sample improved the reproducibility of the results in the flame zone amplification experiment. However, more effort is required to make this experiment still more reproducible. Experiments were performed to determine the frequency spectrum of the combustion noise from burning strands of solid propellant. For all propellants tested, composite and double base alike, the sound intensity increased sharply from 1000 cps to a maximum at approximately 3000 cps and then decreased monotonically with frequency beyond 3000 cps. The sole effect of oxidizer particle size was to change the sound intensity level of the spectrum curve, but not its form.