ID#: 153
Abstract Title: Detonation Propagation in Hydrogen-Oxygen Mixtures with Concentration Gradients
Session Title: Detonation Limit/Failure
Session Date: 7/30/01
Session Start Time: 3:40 PM
Contributing Author: Ishii, K.
Organization: Yokohama National University
Country: Japan
Authors: Kazuhiro Ishii, Yuichi Takahashi, Takao Tsuboi
Short Abstract: A study is made on detonation waves propagating in mixtures with concentration gradients in the direction normal to the propagation direction. By sliding a plate attached to a detonation tube, a dilution gas is diffused into the detonation tube in which a stoichiometric hydrogen-oxygen mixture was initially charged. Changing the opening duration of the plate causes mixtures with various concentration gradients. The experimental results show that detonation initiation is governed by properties of the most detonable part of the mixture. From observation of smoked foil records, the boundary between a cellular and a diamond-shaped pattern, which is formed by triple points originating from cellular structure, indicates a propagation limit owing to the concentration gradient.