Next Article in Journal
Uranium-Series Disequilibria in the Groundwater of the Shihongtan Sandstone-Hosted Uranium Deposit, NW China
Previous Article in Journal
New Insights in the Ontogeny and Taphonomy of the Devonian Acanthodian Triazeugacanthus affinis From the Miguasha Fossil-Lagerstätte, Eastern Canada
Previous Article in Special Issue
Temporal and Spatial Distribution of Respirable Dust After Blasting of Coal Roadway Driving Faces: A Case Study
Article Menu

Export Article

Open AccessArticle
Minerals 2016, 6(1), 2; https://doi.org/10.3390/min6010002

Scale Effect of Premixed Methane-Air Combustion in Confined Space Using LES Model

1
State Key Lab of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 404000, China
2
School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 404000, China
3
Faculty of Engineering, Monash University, Melbourne, Victoria 3800, Australia
4
Mining and Nuclear Engineering Department, Missouri University of Science and Technology, Missouri, MO 65409, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Saiied Aminossadati
Received: 28 October 2015 / Revised: 3 December 2015 / Accepted: 14 December 2015 / Published: 29 December 2015
(This article belongs to the Special Issue Advanced Underground Mine Ventilation and Monitoring Systems)
Full-Text   |   PDF [2486 KB, uploaded 29 December 2015]   |  

Abstract

Gas explosion is the most hazardous incident occurring in underground airways. Computational Fluid Dynamics (CFD) techniques are sophisticated in simulating explosions in confined spaces; specifically, when testing large-scale gaseous explosions, such as methane explosions in underground mines. The dimensions of a confined space where explosions could occur vary significantly. Thus, the scale effect on explosion parameters is worth investigating. In this paper, the impact of scaling on explosion overpressures is investigated by employing two scaling factors: The Gas-fill Length Scaling Factor (FLSF) and the Hydraulic Diameter Scaling Factor (HDSF). The combinations of eight FLSFs and five HDSFs will cover a wide range of space dimensions where flammable gas could accumulate. Experiments were also conducted to evaluate the selected numerical models. The Large Eddy Simulation turbulence model was selected because it shows accuracy compared to the widely used Reynolds’ averaged models for the scenarios investigated in the experiments. Three major conclusions can be drawn: (1) The overpressure increases with both FLSF and HDSF within the deflagration regime; (2) In an explosion duct with a length to diameter ratio greater than 54, detonation is more likely to be triggered for a stoichiometric methane/air mixture; (3) Overpressure increases as an increment hydraulic diameter of a geometry within deflagration regime. A relative error of 7% is found when predicting blast peak overpressure for the base case compared to the experiment; a good agreement for the wave arrival time is also achieved. View Full-Text
Keywords: scale effect; gaseous explosion; Large Eddy Simulation (LES); combustion simulation scale effect; gaseous explosion; Large Eddy Simulation (LES); combustion simulation
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Wang, L.; Que, S.; Tien, J.C.; Aouad, N.S. Scale Effect of Premixed Methane-Air Combustion in Confined Space Using LES Model. Minerals 2016, 6, 2.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Minerals EISSN 2075-163X Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top