Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 42, Issue 11, Pages 7691-7697Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2016.05.028
Keywords
Spherical flame acceleration; Flame instabilities; Gas explosions; Background Oriented Schlieren
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Large-scale experiments examining spherical-flame acceleration in lean hydrogen-air mixtures were performed in a 64 m(3) constant-pressure enclosure. Equivalence ratios ranging from 0.33 to 0.57 were examined using detailed front tracking for flame diameters up to 1.2 m through the use of a Background Oriented Schlieren (BOS) technique. From these measurements, the critical radii for onset of instability for these mixtures, on the order of 2-3 cm, were obtained. In addition, the laminar burning velocity and rate of flame acceleration as a function of radius were also measured. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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