Accession Number : AD0839184

Title :   COLLISION OF SPHERICAL SHOCK WAVES IN WATER,

Corporate Author : NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s) : Coleburn, N. L. ; Roslund, L. A.

Report Date : 31 JUL 1968

Pagination or Media Count : 28

Abstract : Framing camera shadowgraphs were made of the collision of underwater shock waves and the associated spherical flow resulting from the simultaneous underwater detonation of twin, separated explosive spheres. The shock interaction effects were studied as functions of the incident pressures at the point of collision. On the plane of symmetry between the spheres the shock wave reflection is characterized by Mach wave formation. The critical angle for the onset of a Mach wave varied from 36 degrees for incident pressures of 6.5 kbar to 41 degrees for incident pressures of 1.6 kbar. Cavitation occurs at the point of collision of rarefaction waves that are reflected from the product gas bubbles. Peak pressures corresponding to the velocities of the shock waves were obtained using the Hugoniot equation of state of water. (Author)

Descriptors :   (*UNDERWATER EXPLOSIONS, SHOCK WAVES), INTERACTIONS, FLOW FIELDS, PRESSURE, CAVITATION, REFLECTION, SPHERES, WAVE PROPAGATION, EQUATIONS OF STATE, WAVEFORM GENERATORS, SPARK SHADOWGRAPH PHOTOGRAPHY.

Subject Categories : Explosions
      Fluid Mechanics
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE