Simulation of flame acceleration in unconfined vapour cloud explosions

Lars Kjäldman, Risto Huhtanen

Research output: Book/ReportReport

Abstract

The goal of this work was to investigate the feasibility of numerical simulation in accident and safety analysis of unconfined vapour cloud explosions and whether it is possible to simulate the flame acceleration phenomen based on the published data of experiments. Two vapour cloud explosion experiments reported in the literature have been simulated with the PHOENICS-code. The flame acceleration, which was mainly due to the enhanced combustion from turbulence generation at obstacles in the flow regime, could be simulated. The computation gave correct order of magnitude for the maximum overpressure in both explosions, of which one was weak and the other strong. The differences between the computed results and experiments are discussed and suggestions how to improve the simulation model are given. Generally, more simulations of explosions and detailed experimental information of the initial conditions and development of the explosions are needed before simulations can reliably be used in accident and safety analysis.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages56
ISBN (Print)951-38-2384-9
Publication statusPublished - 1985
MoE publication typeD4 Published development or research report or study

Publication series

SeriesValtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports
Number357
ISSN0358-5077

Fingerprint

Explosions
Vapors
Accidents
Experiments
Turbulence
Computer simulation

Keywords

  • simulation
  • flames
  • acceleration
  • vapors
  • explosions

Cite this

Kjäldman, L., & Huhtanen, R. (1985). Simulation of flame acceleration in unconfined vapour cloud explosions. Espoo: VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, No. 357
Kjäldman, Lars ; Huhtanen, Risto. / Simulation of flame acceleration in unconfined vapour cloud explosions. Espoo : VTT Technical Research Centre of Finland, 1985. 56 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 357).
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Kjäldman, L & Huhtanen, R 1985, Simulation of flame acceleration in unconfined vapour cloud explosions. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, no. 357, VTT Technical Research Centre of Finland, Espoo.

Simulation of flame acceleration in unconfined vapour cloud explosions. / Kjäldman, Lars; Huhtanen, Risto.

Espoo : VTT Technical Research Centre of Finland, 1985. 56 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 357).

Research output: Book/ReportReport

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AB - The goal of this work was to investigate the feasibility of numerical simulation in accident and safety analysis of unconfined vapour cloud explosions and whether it is possible to simulate the flame acceleration phenomen based on the published data of experiments. Two vapour cloud explosion experiments reported in the literature have been simulated with the PHOENICS-code. The flame acceleration, which was mainly due to the enhanced combustion from turbulence generation at obstacles in the flow regime, could be simulated. The computation gave correct order of magnitude for the maximum overpressure in both explosions, of which one was weak and the other strong. The differences between the computed results and experiments are discussed and suggestions how to improve the simulation model are given. Generally, more simulations of explosions and detailed experimental information of the initial conditions and development of the explosions are needed before simulations can reliably be used in accident and safety analysis.

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Kjäldman L, Huhtanen R. Simulation of flame acceleration in unconfined vapour cloud explosions. Espoo: VTT Technical Research Centre of Finland, 1985. 56 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 357).