NUMERICAL ESTIMATION OF VARIATION OF BLAST PRESSURE AND TEMPERATURE OF BLAST WAVE WITH TIME DUE TO DETONATION OF TNT IN AIR

Abstract

High explosives on detonation generate high pressure shock waves moving initially at very high velocities in the ambient medium and damage the encountered targets. The expanding hot gases in blast waves are also responsible for the damage. The extent of damage to a target depends on the magnitude of pressure and impulse of the blast wave, and temperature due to explosion. A theoretical analysis is carried out to predict the pressure and temperature produced in the expanding blast as function of time by solving analytically the governing equations. The initial peak pressure and temperature of blast wave, which are required in the theoretical analysis, were calculated making use of the blast wave theory. Results obtained for blast pressures at different distances using this theory were published by the authors earlier. The same numerical analysis is used for obtaining variation of pressure and temperature with time and presented in this paper. The high explosive used in the experiments is TNT of varied weights.