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This paper describes the application of a proposed model to vented gaseous explosions in a small and large-scale equipment with venting of deflagration through exhaust duct to receiver or atmosphere. It was shown that introduction of a duct and vacuumed receiver into explosion protection system can have strong influence on dynamics of vented deflagration and increase of maximum explosion pressure. The physics of this phenomenon was studied. Coincidence between values of the main unknown parameter of the vented combustion process modelturbulization factor x from this work and results following from K.I. Shchelkin and B. Karlovits theories was obtained and c o n f i e d by cinegrams. The 3.7-4 times growth of burnout rate in the vessel due to high level turbulence combustion in the duct was determined by inverse problem method. The discovered effect of combustion intensification can be removed by increase of vent relief pressure or sprinkling of cooling agent into gas mixture flow at the beginning of a duct.

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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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