Lift-off and blow-out of under-expanded hydrogen jets: experiments versus simulations

Volodymyr Shentsov, Ryo Sakatsume, Dmitriy Makarov, Keiji Takeno, Vladimir Molkov

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

Abstract

Turbulent non-premixed flame stability limits are very important for safety considerations, especially for design of thermally activated pressure relief devices (TPRD), e.g. to prevent flame blow-off and hydrogen accumulation in the enclosure. There is a body of research on parameters of lift-off and blow-out for turbulent non-premixed flames. Hydrogen safety engineering requires validated contemporary tools, such as CFD models, that can be used for the design of TPRD, which parameters will provide either the stabilisation of flame or its blow-off, including the effect of wind. The applied in this study CFD model is based on the eddy dissipation concept (EDC) sub-model for combustion, which incorporates a detailed chemistry mechanism with 37 chemical reactions, and the RNG k-epsilon sub-model for turbulence modelling. The model has been successfully applied to simulation of spontaneous ignition during the sudden release of hydrogen into the air, and the numerical study of indoor jet fire regimes. The notional nozzle theory for under-expanded jets is applied as a part of the CFD modelling approach. It is proved to be able to reproduce lift-off and blow-off phenomena that were observed in experiments, with reasonable computational consumption, i.e. CPU time of 6 hours on 64 cores. The model gives insights into the dynamics of the lift-off and blow-off phenomena. The simulations reproduced exactly experimental results on transition from lift-off (0.4 mm nozzle) to blow-off (0.3 mm nozzle) at storage pressure of about 10 MPa.
LanguageEnglish
Title of host publicationUnknown Host Publication
Number of pages8
Publication statusAccepted/In press - 19 Feb 2016
EventThe Eighth International Seminar on Fire & Explosion Hazards (ISFEH8) - Hefei, China
Duration: 19 Feb 2016 → …

Conference

ConferenceThe Eighth International Seminar on Fire & Explosion Hazards (ISFEH8)
Period19/02/16 → …

Fingerprint

Hydrogen
Experiments
Nozzles
Computational fluid dynamics
Safety engineering
Enclosures
Program processors
Ignition
Chemical reactions
Fires
Turbulence
Stabilization
Air

Keywords

  • Blow-off
  • CFD
  • experiment
  • hydrogen jet
  • lift-off
  • simulation

Cite this

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title = "Lift-off and blow-out of under-expanded hydrogen jets: experiments versus simulations",
abstract = "Turbulent non-premixed flame stability limits are very important for safety considerations, especially for design of thermally activated pressure relief devices (TPRD), e.g. to prevent flame blow-off and hydrogen accumulation in the enclosure. There is a body of research on parameters of lift-off and blow-out for turbulent non-premixed flames. Hydrogen safety engineering requires validated contemporary tools, such as CFD models, that can be used for the design of TPRD, which parameters will provide either the stabilisation of flame or its blow-off, including the effect of wind. The applied in this study CFD model is based on the eddy dissipation concept (EDC) sub-model for combustion, which incorporates a detailed chemistry mechanism with 37 chemical reactions, and the RNG k-epsilon sub-model for turbulence modelling. The model has been successfully applied to simulation of spontaneous ignition during the sudden release of hydrogen into the air, and the numerical study of indoor jet fire regimes. The notional nozzle theory for under-expanded jets is applied as a part of the CFD modelling approach. It is proved to be able to reproduce lift-off and blow-off phenomena that were observed in experiments, with reasonable computational consumption, i.e. CPU time of 6 hours on 64 cores. The model gives insights into the dynamics of the lift-off and blow-off phenomena. The simulations reproduced exactly experimental results on transition from lift-off (0.4 mm nozzle) to blow-off (0.3 mm nozzle) at storage pressure of about 10 MPa.",
keywords = "Blow-off, CFD, experiment, hydrogen jet, lift-off, simulation",
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Shentsov, V, Sakatsume, R, Makarov, D, Takeno, K & Molkov, V 2016, Lift-off and blow-out of under-expanded hydrogen jets: experiments versus simulations. in Unknown Host Publication. The Eighth International Seminar on Fire & Explosion Hazards (ISFEH8), 19/02/16.

Lift-off and blow-out of under-expanded hydrogen jets: experiments versus simulations. / Shentsov, Volodymyr; Sakatsume, Ryo; Makarov, Dmitriy; Takeno, Keiji; Molkov, Vladimir.

Unknown Host Publication. 2016.

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

TY - GEN

T1 - Lift-off and blow-out of under-expanded hydrogen jets: experiments versus simulations

AU - Shentsov, Volodymyr

AU - Sakatsume, Ryo

AU - Makarov, Dmitriy

AU - Takeno, Keiji

AU - Molkov, Vladimir

PY - 2016/2/19

Y1 - 2016/2/19

N2 - Turbulent non-premixed flame stability limits are very important for safety considerations, especially for design of thermally activated pressure relief devices (TPRD), e.g. to prevent flame blow-off and hydrogen accumulation in the enclosure. There is a body of research on parameters of lift-off and blow-out for turbulent non-premixed flames. Hydrogen safety engineering requires validated contemporary tools, such as CFD models, that can be used for the design of TPRD, which parameters will provide either the stabilisation of flame or its blow-off, including the effect of wind. The applied in this study CFD model is based on the eddy dissipation concept (EDC) sub-model for combustion, which incorporates a detailed chemistry mechanism with 37 chemical reactions, and the RNG k-epsilon sub-model for turbulence modelling. The model has been successfully applied to simulation of spontaneous ignition during the sudden release of hydrogen into the air, and the numerical study of indoor jet fire regimes. The notional nozzle theory for under-expanded jets is applied as a part of the CFD modelling approach. It is proved to be able to reproduce lift-off and blow-off phenomena that were observed in experiments, with reasonable computational consumption, i.e. CPU time of 6 hours on 64 cores. The model gives insights into the dynamics of the lift-off and blow-off phenomena. The simulations reproduced exactly experimental results on transition from lift-off (0.4 mm nozzle) to blow-off (0.3 mm nozzle) at storage pressure of about 10 MPa.

AB - Turbulent non-premixed flame stability limits are very important for safety considerations, especially for design of thermally activated pressure relief devices (TPRD), e.g. to prevent flame blow-off and hydrogen accumulation in the enclosure. There is a body of research on parameters of lift-off and blow-out for turbulent non-premixed flames. Hydrogen safety engineering requires validated contemporary tools, such as CFD models, that can be used for the design of TPRD, which parameters will provide either the stabilisation of flame or its blow-off, including the effect of wind. The applied in this study CFD model is based on the eddy dissipation concept (EDC) sub-model for combustion, which incorporates a detailed chemistry mechanism with 37 chemical reactions, and the RNG k-epsilon sub-model for turbulence modelling. The model has been successfully applied to simulation of spontaneous ignition during the sudden release of hydrogen into the air, and the numerical study of indoor jet fire regimes. The notional nozzle theory for under-expanded jets is applied as a part of the CFD modelling approach. It is proved to be able to reproduce lift-off and blow-off phenomena that were observed in experiments, with reasonable computational consumption, i.e. CPU time of 6 hours on 64 cores. The model gives insights into the dynamics of the lift-off and blow-off phenomena. The simulations reproduced exactly experimental results on transition from lift-off (0.4 mm nozzle) to blow-off (0.3 mm nozzle) at storage pressure of about 10 MPa.

KW - Blow-off

KW - CFD

KW - experiment

KW - hydrogen jet

KW - lift-off

KW - simulation

M3 - Conference contribution

SN - 978-7-312-04104-4

BT - Unknown Host Publication

ER -