CFD simulation of hydrogen deflagration in a vented room

In the present work, CFD simulations of hydrogen deflagration in a real scale vented room are performed. Two ignition points were simulated: at the wall opposite to the vent (back ignition) and at the center of the chamber (center ignition). The overpressure time series and flame front velocities ar...

Full description

Saved in:
Bibliographic Details
Published in:Journal of physics. Conference series 2015-09, Vol.640 (1), p.12036
Main Authors: Tolias, I C, Venetsanos, A G, Markatos, N C, Kiranoudis, C T
Format: Article
Language:English
Subjects:
Chambers
Deflagration
Explosions
Flame propagation
Flame speed
Hydrogen
Ignition
Overpressure
Physics
Simulation
Taylor instability
Turbulent flames
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In the present work, CFD simulations of hydrogen deflagration in a real scale vented room are performed. Two ignition points were simulated: at the wall opposite to the vent (back ignition) and at the center of the chamber (center ignition). The overpressure time series and flame front velocities are compared with the experimental results. The combustion model is based on the turbulent flame speed concept. The turbulent flame speed is calculated based on a modification of Yakhot's equation, in order to account for all the main physical mechanisms which appear in hydrogen deflagrations. Special attention is given to the simulation of Rayleigh-Taylor instability. This instability occurs at the vent area and results in sudden explosion of the mixture that has been pushed outside the chamber at the initial stage of the explosion. The importance of this external explosion to the generated overpressures inside the chamber is highlighted. The agreement between experimental and computational results is satisfactory in both back ignition and center ignition cases.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/640/1/012036