Numerical Tools for Mitigation of Methane Explosions in Coal Mines
Abstract
This project demonstrated that the numerical technology for gas explosion modeling has now developed to the point where it can be reliably used for predicting flame acceleration, possible deflagration-to-detonation transition, and resulting pressures in methane-air mixtures contained in large obstructed areas typical of coal mines. In particular, the simulations showed that detonations can form in coal mine tunnels longer than 35 m, and that they produce short pressure peaks at protective walls (seals) that are significantly higher than the static pressure requirements listed in current regulations. We also used the numerical models developed and tested in this program to analyze the efficiency of passive blast attenuators constructed of rock rubble for protecting mine seals. The conclusion of this part of the study is that the ability of seals to mitigate effects of pressure waves is greatly reduced when flames are present. This result is related to the fact that flames propagating through obstacle arrays, such as piles of rocks, accelerate and generate strong shocks or detonations. The importance of predictive capabilities developed for this project extends beyond the coal-mine industry. The same computational technology can be instrumental in developing new devices for gas explosion prevention and mitigation in many industries where the risk of gas explosions exists.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 05, 2019
- Accession Number
- AD1075717
Entities
People
- Carolyn R. Kaplan
- Elaine Oran
- Huahua Xiao
- Ryan Houim
- Vadim N. Gamezo
- Weilin Zheng
Organizations
- United States Naval Research Laboratory