Accession Number : ADA194642

Title :   A Review of the Propagation of Pressure Pulses Produced by Small Underwater Explosive Charges.

Descriptive Note : Memorandum rept. 16 Jul-22 Aug 86,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s) : Temkin, S

PDF Url : ADA194642

Report Date : 05 May 1988

Pagination or Media Count : 47

Abstract : This report reviews, from the point of view of nonlinear acoustics, the propagation of pressure pulses due to small underwater explosions, such as those used in scattering experiments. We have concentrated our attention on the peak-pressure region, as it is here that nonlinear effects are likely to appear. It has been found that for some values of the physical parameters, there are ranges where the nonlinear theory gives values for the peak pressure that are quite close to those predicted by the experimental, (W1/3/R)1.13 fit. This agreement is found for relatively strong pressure pulses. However, it is concluded that for typical charges used in scattering experiments, nonlinear effects must be negligible, except very near the charges. By implication, it is concluded that except for very close ranges where the shock front is too strong to be considered as a weak shock wave, the decay of the pressure peak in such pulses should be as predicted by linear acoustic theory. As this is not found experimentally, it is suggested that some effects may have been present in the experiments that are not represented by the empirical fit. Keywords: Pulse propagation, Explosive charges, Nonlinear lengthening, (JS).

Descriptors :   *EXPLOSIVE CHARGES, *UNDERWATER ORDNANCE, UNDERWATER EXPLOSIONS, PROPAGATION, PULSES, SHOCK WAVES, ACOUSTIC DETECTORS, ACOUSTIC EMISSIONS, WAVEFRONTS, TNT, FLUID DYNAMICS

Subject Categories : Underwater Ordnance
      Explosions
      Ammunition and Explosives

Distribution Statement : APPROVED FOR PUBLIC RELEASE