Shock Induced Exothermic Reactions in Powder Mixtures

摘要

Many investigators have subjected reactants to, known impact velocities and thenanalyzed the ost shock specimens to discern whether or not reactions have, occurred. These studies recognize that reactions take place due to the elevated post shock residual temperatures but are more interested in the presumption that the reactions are initiated during the large pressure increases seen within the shock front or soon after during the shock plateau. There are few physical measurements to substantiate the conjecture of shockfront induced reaction. There have been two types of attempts to measure the changes within a shocked system due to an exothermic reaction occuring during the passage of a shock wave. Taylor' has used a radiation pyrometer to look at the temperature of a Ni-Al system, and Batsanov2 has measured pressure in a powdered Sn-S system under shock loading. Batsanov obtained an experimental P-v Hugoniot for an assumed constant volume reaction of a Sn-S system that is to the right of both the expected product and reactant Hugoniots. A reproduction of these Hugoniots based on models discussed later . Our investigation is attempting to measure a similar time resolved pressure increase due to the exothermic heat of reaction in a shocked mixture. This pressure measurement is intended as a diagnostic tool to follow the reaction kinetics during the passage of a shockwave.