High speed photographic investigation of the first bubble period created by an underwater explosion.
Abstract
A relatively safe and inexpensive method was developed for the
investigation of the oscillating bubble caused by the hot gases from
an underwater explosion. High speed photography was employed to
record the pulsations of the bubble caused by the detonation of decigram
center-detonated spherical charges of P.E.T.N. Timing marks on
the film were used to record the time interval or period of each
oscillation. A description of the equipment constructed and used in
the investigation is included in the body of the report.
Calculations were carried out using the bubble period data and a
semi-empirical equation with a rational basis to arrive at the relative
underwater explosive strength of P. E.T.N, and T,N.T. Results
obtained and recommendations for future work are offered in the last
part of the report. Photographs of the entire sequence of events of an underwater
explosion from detonation to the collapse of the second bubble are
included as a appendix to this report.
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