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Methane-air detonation experiments at NIOSH Lake Lynn Laboratory.

Authors
Zipf-RK Jr.; Gamezo-VN; Sapko-MJ; Marchewka-WP; Mohamed-KM; Oran-ES; Kessler-DA; Weiss-ES; Addis-JD; Karnack-FA; Sellers-DD
Source
Proceedings of the Eighth International Symposium on Hazards, Prevention, and Mitigation of Industrial Explosions, September 5-10, 2010, Yokohama, Japan. Japan: Keio University, ISH110, 2010 Sep; :1-11
NIOSHTIC No.
20037639
Abstract
The methane-air detonation experiments are performed to characterize high pressure explosion processes that may occur in sealed areas of underground coal mines. The detonation tube used for these studies is 73 m long, 105 cm internal diameter, and closed at one end. The test gas is 97.5% methane with about 1.5% ethane, and the methane-air test mixtures varied between 4% and 19% methane by volume. Detonations were successfully initiated for mixtures containing between 5.3% and 15.5% methane. The detonations propagated with an average velocity between 1,512 to 1,863 m/s. Average overpressures recorded behind the first shock pressure peak varied between 1.2 and 1.7 MPa. The measured detonation velocities and pressures are close to their corresponding theoretical Chapman-Jouguet (CJ) detonation velocity (DCJ) and detonation pressure (PCJ). Outside of these detonability limits, failed detonations produced decaying detached shocks and flames propagating with velocities of approximately DCJ. Cell patterns on smokefoils during detonations were very irregular and showed secondary cell structures inside primary cells. The measured width of primary cells varied between 20 cm near the stoichiometry and 105 cm (tube diameter) near the limits. The largest detonation cell (105-cm wide and 170-cm long) was recorded for the mixture containing 15.3% methane.
Keywords
Underground-mining; Mining-industry; Explosion-prevention; Explosion-protection; Explosive-dusts; Explosive-atmospheres; Explosive-gases; Explosive-hazards; Methane-control; Methanes; Coal-mining; Author Keywords: Detonation; methane; experiments; limits
Contact
R. K. Zipf, Jr., Office of Mine Safety and Health Research (OMSHR), National Institute for Occupational Safety and Health (NIOSH), Pittsburgh, PA 15236, USA
Publication Date
20100905
Document Type
Conference/Symposia Proceedings
Email Address
RZipf@cdc.gov
Fiscal Year
2010
NTIS Accession No.
NTIS Price
NIOSH Division
OMSHR
Priority Area
Mining
Source Name
Proceedings of the Eighth International Symposium on Hazards, Prevention, and Mitigation of Industrial Explosions, September 5-10, 2010, Yokohama, Japan
State
PA; DC
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