Doctoral Dissertations

Author

Liang Wang

Keywords and Phrases

Large Eddy Simulation (LES); Methane explosion; Premixed combustion; Scaling effect

Abstract

"This research seeks to improve the prediction efficiency of gaseous explosions realized by numerical simulations in a full-scale underground network using a decoupled method. To provide quick predictions of overpressure distribution of methane explosions in underground airway networks, a two-section theory is employed. The explosion space is divided into a driver section and a blast-wave section. Governing equations including conservation of mass, momentum, and energy, together with chemical reaction and turbulence models are solved for the driver and the blast-wave sections using computational fluid dynamics (CFD) solver ANSYS Fluent (3D-based) and Flowmaster (1D-based) respectively. The three dimensional (3D) and one dimensional (1D) numerical analyses are preceded separately (decoupled). In the driver section, the numerical calculation results with three variables (FLSF, HDSF, and concentration) considering the size of explosion space and methane concentration level for the driver section are stored in a database tool Microsoft SQL Server Express aims to generate a methane explosion source database. To validate the selected combustion and turbulent models, a series of lab-scale methane explosion experiments were conducted. In the blast-wave section, the influences of geometric changes are quantified by using 2D Euler equations, whereas the simulation results are used to adjust the 1D network-based modeling. The decoupled method is applied in two case studies and proved capable to predict the pressure distribution of methane explosions that occurs in a complex airway network."--Abstract, page iii.

Advisor(s)

Tien, Jerry C.
Aouad, Nassib

Committee Member(s)

Awuah-Offei, Kwame, 1975-
Baird, Jason, 1955-
Ge, Mao Chen
Jiang, Deyi

Department(s)

Mining and Nuclear Engineering

Degree Name

Ph. D. in Mining Engineering

Publisher

Missouri University of Science and Technology

Publication Date

Spring 2015

Pagination

xiv, 195 pages

Note about bibliography

Includes bibliographic references (pages 189-194).

Rights

© 2015 Liang Wang, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Library of Congress Subject Headings

Mine explosions -- Mathematical models
Mine explosions -- Computer simulation
Methane
Combustion -- Research

Thesis Number

T 10729

Electronic OCLC #

913410917

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