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Science and Technology of Energetic Materials

Vol.77, No.1 (2016)

Research paper

Numerical study on three-dimensional flow effect of self-ignition induced by high pressure hydrogen jet in a rectangular tube
Akinori Yokoyama, Makoto Asahara, Nobuyuki Tsuboi, and A. Koichi Hayashi
p.7-12

Abstract

Self-ignition in high-pressure hydrogen jets may take place when transverse shock waves are generated from diaphragm transformation. In this study, a numerical analysis was performed to find out the mechanism of self-ignition in a high-pressure hydrogen jet in a tube. High-pressure hydrogen and air at the atmospheric pressure were mixed to yield vortices in the boundary layer and at the contact surface. The high temperature and high-pressure atmosphere in the mixing region, and the generation of a precursor shock wave following the flow of hydrogen under such high-pressure conditions, caused self-ignition. A numerical simulation showed that the ignition happens within the vortices in the tube.

Keywords

self-ignition, hydrogen, shock wave, contact surface, transverse wave

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