The Library
The effect of concentration gradients on deflagration-to-detonation transition in a rectangular channel with and without obstructions – a numerical study
Tools
Tools
Tools
Khodadadi Azadboni, Reza, Heidari, Ali, Boeck, Lorenz R. and Wen, Jennifer X. (2019) The effect of concentration gradients on deflagration-to-detonation transition in a rectangular channel with and without obstructions – a numerical study. International Journal of Hydrogen Energy, 44 (13). pp. 7032-7040. doi:10.1016/j.ijhydene.2019.01.157 ISSN 0360-3199.
|
PDF
WRAP-effect-concentration-gradients-deflagration-detonation-transition-Wen-2019.pdf - Accepted Version - Requires a PDF viewer. Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0. Download (1558Kb) | Preview |
Official URL: http://dx.doi.org/10.1016/j.ijhydene.2019.01.157
Abstract
Explosions in homogeneous reactive mixtures have been widely studied both experimentally and numerically. However, in accident scenarios, mixtures are usually inhomogeneous due to the localized nature of most fuel releases, buoyancy effects and the finite time between release and ignition. It is imperative to determine whether mixture inhomogeneity can increase the explosion hazard beyond what is known for homogeneous mixtures. The present numerical investigation aims to study flame acceleration and transition to detonation in homogeneous and inhomogeneous hydrogen-air mixtures with two different average hydrogen concentrations in a horizontal rectangular channel. A density-based solver was implemented within the OpenFOAM CFD toolbox. The Harten–Lax–van Leer–Contact (HLLC) scheme was used for accurate shock capturing. A high-resolution grid is provided by using adaptive mesh refinement, which leads to 30 grid points per half reaction length (HRL). In agreement with previous experimental results, it is found that transverse concentration gradients can either strengthen or weaken flame acceleration, depending on average hydrogen concentration and channel obstruction. Comparing experiments and simulations, the paper analyses flame speed and pressure histories, identifies locations of detonation onset, and interprets the effects of concentration gradients.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Subjects: | T Technology > TH Building construction T Technology > TP Chemical technology |
||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||||
| Library of Congress Subject Headings (LCSH): | Hydrogen as fuel, Flame spread | ||||||||
| Journal or Publication Title: | International Journal of Hydrogen Energy | ||||||||
| Publisher: | Elsevier BV | ||||||||
| ISSN: | 0360-3199 | ||||||||
| Official Date: | 8 March 2019 | ||||||||
| Dates: |
|
||||||||
| Volume: | 44 | ||||||||
| Number: | 13 | ||||||||
| Page Range: | pp. 7032-7040 | ||||||||
| DOI: | 10.1016/j.ijhydene.2019.01.157 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||
| Date of first compliant deposit: | 11 February 2019 | ||||||||
| Date of first compliant Open Access: | 7 February 2020 | ||||||||
| RIOXX Funder/Project Grant: |
|
Request changes or add full text files to a record
Repository staff actions (login required)
 |
View Item |
Downloads
Downloads per month over past year
