Studies on Explosion II On the Measurement of the Dynamic Pressure Caused by Explosion of Powders

Abstract

Smokeless powders such as nitrocellulose containing nitroglycerine have been used for common propellants. Recently, these powders have also been used as the propellant of rivet steels. The efficiency of a rivet ejector is mainly influenced by the exploding properties of powders. In this respect, we especially measured the dynamic pressure caused by the explosion of powders, and discussed the relation between the dynamic pressure and the several properties of these powders such as particle size, particle from, and surface conditions of particles. We further discussed the initiating methods of these powders. From the results of these expariments, we recognized the following facts : (1) The wave form of the dynamic pressure caused by the explosion of powders is scarcely influenced by the components and particle form of these powders, if an explosion is caused in a closed chamber with the loading density of powders of 0.3g/cc or more. (2) Reacting period of powders in a closed chamber is not effected by the initiating methods. (3) Wave form of the dynamic pressure is influenced by the state of the closed chamber. The details of the measuring methnds for the dynamic pressure and the overall results of the experiments are shown in this paper.