Accession Number : AD0769282

Title :   Analysis of a Nuclear-Burst Boundary Layer.

Descriptive Note : Final rept. 21 Oct 71-26 Jan 73,

Corporate Author : PHYSICS INTERNATIONAL CO SAN LEANDRO CA

Personal Author(s) : Swift, R. P.

Report Date : OCT 1973

Pagination or Media Count : 61

Abstract : Calculations of a nuclear surface burst boundary layer for two yields differing by a scale factor of four are analyzed. The calculations were made with an Integral-Characteristic Code, and included the effects of radiative energy transfer, turbulence, and surface ablation. A thermal boundary layer is produced which substantially alters the near surface environment from that of the free field airblast flow. These altered conditions are examined from a viewpoint of how hardened structure and power system design criteria may be affected. One important effect that the calculations demonstrate is that a significant reduction in surface thermal conditions is achieved which prevents massive surface ablation. Another important effect illustrated is the large reduction of Mach number which takes place within the boundary layer. This raises the possibility of a potentially hazardous increase in the blast pressure transmitted in air entrainment system ducts. (Modified author abstract)

Descriptors :   *NUCLEAR EXPLOSIONS, *NUCLEAR FIREBALL, RADIATIVE TRANSFER, GRANITE, THERMAL RADIATION, BLAST, THERMAL BOUNDARY LAYER, HYDRODYNAMICS, RADIATION HARDENING, SURFACE BURST, STRUCTURES, ABLATION.

Subject Categories : Nuclear Weapons

Distribution Statement : APPROVED FOR PUBLIC RELEASE