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Detonability of natural gas-air mixtures.

Authors
Gamezo-VN; Zipf-RK Jr.; Sapko-MJ; Marchewka-WP; Mohamed-KM; Oran-ES; Kessler-D; Weiss-ES; Addis-JD; Karnack-FA; Sellers-DD
Source
Combust Flame 2012 Feb; :159(2):870-881
NIOSHTIC No.
20039820
Abstract
Direct initiation experiments were carried out in a 105 cm diameter tube to study detonation properties and evaluate the detonability limits for mixtures of natural gas (NG) with air. The natural gas was primarily methane with 1.5-1.7% of ethane. A stoichiometric methane-oxygen mixture contained in a large plastic bag was used as a detonation initiator. Self-supporting detonations with velocities and pressures close to theoretical CJ values were observed in NG-air mixtures containing from 5.3% to 15.6% of NG at atmospheric pressure. These detonability limits are wider than previously measured in smaller channels, and close to the flammability limits. Detonation cell patterns recorded near the limits vary from large cells of the size of the tube to spiral traces of spin detonations. Away from the limits, detonation cell sizes decrease to about 20 cm for 10 percent NG, and are consistent with existing data for methane-air mixtures obtained in smaller channels. Observed cell patterns are very irregular, and contain secondary cell structures inside primary cells and fine structures inside spin traces.
Keywords
Gases; Gas-mixtures; Explosive-atmospheres; Explosive-gases; Mining-industry; Mine-gases; Ignitability; Natural-gas; Methanes; Ethanes
Contact
Vadim N. Gamezo, Laboratory for Computational Physics and Fluid Dynamics, Naval Research Laboratory, Washington, DC 20375, USA
CODEN
CBFMAO
CAS No.
74-82-8; 74-84-0
Publication Date
20120201
Document Type
Journal Article
Fiscal Year
2012
NTIS Accession No.
NTIS Price
Identifying No.
B11122011
Issue of Publication
2
ISSN
0010-2180
NIOSH Division
OMSHR
Priority Area
Mining
Source Name
Combustion and Flame
State
PA; DC
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