Towards the Implementation of Rayleigh-Taylor Instability into the Multi-Phenomena Deflagration Model

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Data obtained from experiments carried out at the FM Global large scale deflagration chamber have been used to further develop the multi-phenomena deflagration model. This model has been under development at the University of Ulster during the last decade. This expansion of the deflagration model accounts for the inclusion of Rayleigh-Taylor (RT) instability, as an additional time-dependent combustion enhancing mechanism. The previous version of the LES deflagration model without the addition of RT instability underpredicted the experimental results, due to the model not properly capturing the external deflagration observed during the experiment. Following this underprediction, RT instability was identified as playing a significant role in combustion enhancement as the flame front accelerated towards the vent and during combustion outside the enclosure. The implementation of a mechanism to account for RT instability, in the form of an additional time-dependent flame wrinkling factor, led to an intensification of the external deflagration. This resulted in closer agreement between the simulated and experimental pressure transients.
LanguageEnglish
Title of host publicationUnknown Host Publication
Place of PublicationSingapore
Pages932-941
Number of pages10
DOIs
Publication statusPublished - 1 May 2013
EventSeventh International Seminar on Fire & Explosion Hazards (ISFEH7) - Providence, RI, USA
Duration: 1 May 2013 → …

Conference

ConferenceSeventh International Seminar on Fire & Explosion Hazards (ISFEH7)
Period1/05/13 → …

Fingerprint

combustion
experiment

Keywords

  • Rayleigh-Taylor instability
  • vented deflagration
  • external deflagration
  • simulations

Cite this

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title = "Towards the Implementation of Rayleigh-Taylor Instability into the Multi-Phenomena Deflagration Model",
abstract = "Data obtained from experiments carried out at the FM Global large scale deflagration chamber have been used to further develop the multi-phenomena deflagration model. This model has been under development at the University of Ulster during the last decade. This expansion of the deflagration model accounts for the inclusion of Rayleigh-Taylor (RT) instability, as an additional time-dependent combustion enhancing mechanism. The previous version of the LES deflagration model without the addition of RT instability underpredicted the experimental results, due to the model not properly capturing the external deflagration observed during the experiment. Following this underprediction, RT instability was identified as playing a significant role in combustion enhancement as the flame front accelerated towards the vent and during combustion outside the enclosure. The implementation of a mechanism to account for RT instability, in the form of an additional time-dependent flame wrinkling factor, led to an intensification of the external deflagration. This resulted in closer agreement between the simulated and experimental pressure transients.",
keywords = "Rayleigh-Taylor instability, vented deflagration, external deflagration, simulations",
author = "James Keenan and Dmitriy Makarov and Vladimir Molkov",
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Keenan, J, Makarov, D & Molkov, V 2013, Towards the Implementation of Rayleigh-Taylor Instability into the Multi-Phenomena Deflagration Model. in Unknown Host Publication. Singapore, pp. 932-941, Seventh International Seminar on Fire & Explosion Hazards (ISFEH7), 1/05/13. https://doi.org/10.3850/978-981-07-5936-0_14-06

Towards the Implementation of Rayleigh-Taylor Instability into the Multi-Phenomena Deflagration Model. / Keenan, James; Makarov, Dmitriy; Molkov, Vladimir.

Unknown Host Publication. Singapore, 2013. p. 932-941.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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N2 - Data obtained from experiments carried out at the FM Global large scale deflagration chamber have been used to further develop the multi-phenomena deflagration model. This model has been under development at the University of Ulster during the last decade. This expansion of the deflagration model accounts for the inclusion of Rayleigh-Taylor (RT) instability, as an additional time-dependent combustion enhancing mechanism. The previous version of the LES deflagration model without the addition of RT instability underpredicted the experimental results, due to the model not properly capturing the external deflagration observed during the experiment. Following this underprediction, RT instability was identified as playing a significant role in combustion enhancement as the flame front accelerated towards the vent and during combustion outside the enclosure. The implementation of a mechanism to account for RT instability, in the form of an additional time-dependent flame wrinkling factor, led to an intensification of the external deflagration. This resulted in closer agreement between the simulated and experimental pressure transients.

AB - Data obtained from experiments carried out at the FM Global large scale deflagration chamber have been used to further develop the multi-phenomena deflagration model. This model has been under development at the University of Ulster during the last decade. This expansion of the deflagration model accounts for the inclusion of Rayleigh-Taylor (RT) instability, as an additional time-dependent combustion enhancing mechanism. The previous version of the LES deflagration model without the addition of RT instability underpredicted the experimental results, due to the model not properly capturing the external deflagration observed during the experiment. Following this underprediction, RT instability was identified as playing a significant role in combustion enhancement as the flame front accelerated towards the vent and during combustion outside the enclosure. The implementation of a mechanism to account for RT instability, in the form of an additional time-dependent flame wrinkling factor, led to an intensification of the external deflagration. This resulted in closer agreement between the simulated and experimental pressure transients.

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