Pressure effects of an ignited release from onboard storage in a garage with a single vent

Brennan, Síle; Hussein, Hussein; Макаров, Д. Н.; Shentsov, Volodymyr; Molkov, Vladimir

doi:10.1016/j.ijhydene.2018.07.130

Cited by 18 publications

(16 citation statements)

References 8 publications

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“…Cases 4 and 5 examine a reduced TPRD diameter. The vent in Case 5 is similar to that investigated in previous work [16], which was considered as a worst garage case scenario, the difference here is the TPRD diameter has been reduced from 5.08 mm to 0.5 mm for safety.…”

Section: Real Scale Garagementioning

confidence: 80%

“…In recent work [16] by the authors, a preliminary study was carried out to examine the difference in pressure peaking for an unignited and ignited release. Simulations predicted that the ignited hydrogen release might lead to overpressures two orders of magnitude greater than those reached if the release was unignited.…”

Section: Results Of Garage Simulationsmentioning

confidence: 99%

“…The case considered in [15] was a 0.299 kg/s constant release and a 0.55 m x 0.35 m vent, hence this configuration was the starting point for the work presented here (case 1). Some changes have been made to the simulation approach presented in [16], to reflect the findings of the validation study presented here. Namely, PRESTO!…”

Section: Results Of Garage Simulationsmentioning

confidence: 99%

“…The Realizable k-ε turbulent model [16] was considered to solve the transport equation for turbulence kinetic energy (k) and turbulent dissipation rate (ε):…”

Section: Turbulence Modelmentioning

confidence: 99%

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Numerical validation of pressure peaking from an ignited hydrogen release in a laboratory-scale enclosure and application to a garage scenario

Hussein

Brennan

Shentsov

et al. 2018

International Journal of Hydrogen Energy

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Highlights  Study on pressure peaking for ignited hydrogen releases in enclosures  Description and validation of CFD model for ignited pressure peaking phenomena  Focuses on a small-scale validation case and a real scale residential garage  Heat transfer, vent size and release rate impact on the pressure peak  Pressure peak for ignited release 2 orders of magnitude greater than unignited case *Highlights (for review)

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Section: Real Scale Garagementioning

confidence: 80%

Section: Results Of Garage Simulationsmentioning

confidence: 99%

Section: Results Of Garage Simulationsmentioning

confidence: 99%

“…The Realizable k-ε turbulent model [16] was considered to solve the transport equation for turbulence kinetic energy (k) and turbulent dissipation rate (ε):…”

Section: Turbulence Modelmentioning

confidence: 99%

See 2 more Smart Citations

Numerical validation of pressure peaking from an ignited hydrogen release in a laboratory-scale enclosure and application to a garage scenario

Hussein

Brennan

Shentsov

et al. 2018

International Journal of Hydrogen Energy

Self Cite

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“…Indeed, recent work [8] has validated the phenomenon in a laboratory scale enclosure typical with dimensions and leak rates characteristic of a fuel cell. This work seeks to clarify the phenomena for an unignited release, present usable hydrogen safety engineering tools to inform design and the permitting processes and highlights the need to perform analysis for an ignited case, a scenario also under consideration by the authors [16].…”

Section: Introductionmentioning

confidence: 99%

Pressure peaking phenomenon for indoor hydrogen releases

Brennan

Molkov

2018

International Journal of Hydrogen Energy

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The pressure peaking phenomenon can be observed when hydrogen is released in enclosures with vent(s). The unforeseen physical phenomena of pressure peaking has been described and explained. This phenomenon occurs for hydrogen releases in enclosures where the vent(s), volume, and leak rate are such that there will be no air ingress to the enclosure. Pressure peaking describes the physical phenomenon of a peak in the pressure transient during such a release for some release conditions in a vented enclosure. This phenomenon is pronounced only for gases lighter than air, e.g. hydrogen and helium. For particular release flow rates and vent sizes the peak can be an order of magnitude higher compared to the steady-state overpressure that is reached when the enclosure is fully filled with hydrogen over time. This finding is relevant to all hydrogen applications indoors from a fuel cell in an enclosure or laboratory scale storage up to a forklift in a warehouse. The peak magnitude depends on the release flow rate, hydrogen inventory, enclosure volume and the ventilation area, and potentially can exceed the maximum pressure which the enclosure can withstand. A look up nomogram for applicability of the developed theory that is based on vent area and leak rate has been created for sustained releases. Experimental evidence of the phenomena is described. Reduced analytical equations are presented for the case of a constant flow rate release, and the associated nomogram is presented for use by hydrogen safety engineers and regulators. Highlights  Describes and explains the pressure peaking phenomena for indoor hydrogen releases  Occurs when leak and geometry configuration lead to no air ingress to the enclosure  Nomogram to calculate peak overpressure for constant leak rate in an enclosure  Reduced analytical equations are given  Tools presented for use by hydrogen safety engineers and regulators *Highlights (for review)

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Thermal and fire characteristics of hydrogen jet flames in the tunnel at longitudinal ventilation strategies

Xie

Wang

et al. 2021

Fuel

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Pressure effects of an ignited release from onboard storage in a garage with a single vent

Cited by 18 publications

References 8 publications

Numerical validation of pressure peaking from an ignited hydrogen release in a laboratory-scale enclosure and application to a garage scenario

Numerical validation of pressure peaking from an ignited hydrogen release in a laboratory-scale enclosure and application to a garage scenario

Pressure peaking phenomenon for indoor hydrogen releases

Thermal and fire characteristics of hydrogen jet flames in the tunnel at longitudinal ventilation strategies

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