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Large-scale experiments and absolute detonability of methane/air mixtures.

Authors
Oran-ES; Gamezo-VN; Zipf-RK Jr.
Source
Combust Sci and Technol 2015 Jan; 187(1-2):324-341
NIOSHTIC No.
20045531
Abstract
The Gas Explosions Research Facility at Lake Lynn Experimental Mines was used to determine the detonability limit of methane for a 1-meter diameter tube as a function of the percent of methane in air. The measurements showed detonation limits of 5.3% (lean) and 15.6% (rich). A method for extrapolating these limits to larger systems, more relevant to coal mine tunnels, was proposed based on a simple scaling law and some empirical information on the number of cells required for a detonation to propagate in closed, open, and partially open geometries. The scaling law reproduces the measured detonation-cell sizes measured in the 1-m tube. Applying this to a tunnel the size of a coal mine produces a detonability limit less than the currently measured flammability limit for methane/air at atmospheric conditions, which raises interesting questions for detonation and combustion theory and suggests measurements in larger tubes.
Keywords
Gases; Explosions; Explosion; Explosive-gases; Methanes; Measurement-equipment; Coal-mining; Tunneling; Underground-mining; Author Keywords: Absolute detonability; Detonation cell size; Explosion limits; Methane-air explosions; Methane detonability
Contact
E. S. Oran, Laboratory for Computational Physics and Fluid Dynamics, Naval Research Laboratory, 4555 Overlook Ave. SW, Washington, DC 20375
CODEN
CBSTB9
CAS No.
74-82-8
Publication Date
20150101
Document Type
Journal Article
Email Address
elaine.oran@gmail.com
Fiscal Year
2015
NTIS Accession No.
NTIS Price
Issue of Publication
1-2
ISSN
0010-2202
NIOSH Division
OMSHR
Source Name
Combustion Science and Technology
State
MD; DC; PA
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