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Critical conditions of hydrogen-air detonation in partially confined geometry

Type of Publication
Year of Publication
2013
Authors

W. Rudy; M. Kuznetsov; R. Porowski; A. Teodorczyk; J. Grune; K. Sempert

Abstract

This work presents the results of the large scale experiments with detonation propagating in hydrogen-air mixtures in partially confined geometries. The main aim of the work was to find the critical conditions for detonation propagation in semi-confined geometries with uniform and non-uniform hydrogen-air mixtures. The experimental facility consisted of rectangular 9 x 3 x 0.6 m channel open from the bottom, acceleration section and test section, safety vessel, gas injection and data acquisition system. Sooted plates technique was used as a witness of the detonation. The rectangular channel was placed in a 100 m(3) safety vessel. For uniform hydrogen-air mixtures experiments with four different channel heights h were performed: 8, 5, 3 and 2 cm. The critical hydrogen-air mixture height h(*) for which the detonation may propagate in a layer is close to the 3 cm which corresponds to approximately three detonation cell sizes. For non-uniform hydrogen-air mixture with hydrogen concentration slope equal approximately -1.1%2H-2/cm the critical hydrogen concentration at the top of the layer is approximately equal 26%2and the mean detonation layer height is close to the 8.5 cm corresponding to the hydrogen concentration at the bottom of the layer approximately equal 16-17%2 (C) 2012 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

DOI

10.1016/j.proci.2012.07.019

Volume

34

Notes

Times Cited: 0 2 0

Pagination

1965-1972

ISSN Number

1540-7489

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