Abstract
It is known that acoustic cavitation can provide an effective means of concentrating mechanical energy; the pressure inside a collapsing cavity may reach thousands of bars and the temperature thousands of degrees. Liquid propellants have been considered for use in large military guns for several years but lack of internal ballistics control has prevented their implementation. An acoustic technique, utilizing cavitation, is being examined for possible use in one specific problem area, propellant ignition. It has been determined that an acoustic horn, developing an intensity of approximately 20 W at its tip, can initiate in the propellant free oxygen release, metal oxidation, and, in certain instances, ignition. It is suggested that this technique has possible use as an ignitor in a liquid propellant gun or as a sensitivity‐test mechanism for various propellant lots. [Work supported by the Naval Ordnance Station, Indian Head, Maryland.]
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