Acoustic Resonance in Solid Propellant Rockets

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Abstract
Attention is drawn to the fact that the solid propellant must, in general, be considered as one of the acoustic media in a rocket motor. The viscoelastic properties of the solid along with those of the burned gases determine the characteristic modes of the system corresponding to the particular boundary conditions imposed on these media by the metal components. In addition, these properties of the media contribute strongly to the selection of the regions of stability and instability of the system and therefore to the intermittent and sporadic nature characteristic of resonant burning in solid propellant motors. Calculations are carried out to illustrate the general nature of the phenomenon, and the relationship of these studies to a variety of experimental observations is discussed.

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