The relationship between the longitudinal mode oscillatory combustion phenomena in solid-propellant motors and the motor configuration is experimentally examined using small test motors with various grain configurations. The test results show that the establishment of longitudinal oscillation closely relates to a change of the port area along the motor axis, the internal gas flow conditions, and the motor slenderness. The effects of these parameters on the motor design criterion are qualitatively discussed in relation to the propellant response function and the agglomerative burning of aluminum particles. The test results of an effective mechanical suppression device applied to an actual sounding rocket motor are also presented.
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