473
Views
40
CrossRef citations to date
0
Altmetric
Original Articles

LES of Hydrogen-Air Deflagrations in a 78.5-m Tunnel

, &
Pages 796-808 | Received 19 Dec 2007, Published online: 09 May 2008
 

Abstract

A large eddy simulation (LES) model of gaseous deflagration, previously validated against the largest known 20-m diameter deflagration in the open atmosphere, is applied in this study to reproduce experimental data on uniform 20% and 30% hydrogen-air mixture explosions in a 78.5-m long tunnel. The model enables the transient modelling of deflagration dynamics with a laminar flamelet burning velocity which alters spatially and in time with mixture composition, pressure, and temperature. The turbulent burning velocity is computed using Yakhot's model of premixed turbulent combustion. Yakhot's transcendental equation is essentially customized to account for both the transitional phenomenon of turbulence generated by the flame front itself, and the fractal structure of the flame surface on an unresolved sub-grid scale (SGS) level. The LES model reproduced available experimental data for both 20% and 30% hydrogen-air mixtures in an unobstructed and an obstructed tunnel. The simulations gave insight into the dynamics of flame propagation and the pressure build up within and outside of the tunnel. The LES model enabled the analysis of phenomena that were not reported in the experimental study. For example, a significant increase in the maximum explosion overpressure was observed in the vicinity of obstacles due to obstacle side-on pressure wave reflection in later stages of the event.

Log in via your institution

Log in to Taylor & Francis Online

PDF download + Online access

  • 48 hours access to article PDF & online version
  • Article PDF can be downloaded
  • Article PDF can be printed
USD 61.00 Add to cart

Issue Purchase

  • 30 days online access to complete issue
  • Article PDFs can be downloaded
  • Article PDFs can be printed
USD 1,493.00 Add to cart

* Local tax will be added as applicable

Related Research

People also read lists articles that other readers of this article have read.

Recommended articles lists articles that we recommend and is powered by our AI driven recommendation engine.

Cited by lists all citing articles based on Crossref citations.
Articles with the Crossref icon will open in a new tab.