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

Abstract

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)

Parameter estimation using Bayesian approach for a model of Pressure Peaking Phenomena-ignited H2 releases

“…From the previous study on PPP it is known that C=1 is an assumption that can't be applied, and lower values showed better accuracy. The reasoning of choosing the values of C in the work of Hussein et al, (2018) and was based on the literature knowledge and validated against their experiments. The values presented in their work are not.…”

“…To observe overpressure the mass flow rate of discharged hydrogen into an enclosure has to be relatively high while the ventilation area has to be relatively small . The chosen combination of vent area and mass flow rates is based on previous unignited experiments (Lach, 2019) and studies on PPP (Hussein et al, 2018). The pressure peak phenomenon for hydrogen jet fires in the 14.9m 3 enclosure was successfully observed during all 31 experiments.…”

“…The parameters used for the simulation were typical TPRD diameter and low ventilation area (commonly used in UK and France). Further numerical study of pressure peaking from ignited hydrogen releases was performed by Hussein et al (2018). Their simulations were performed for small scale enclosures (experimental result from 1m 3 enclosure) and real scale (garage-like) for the common use of TPRD diameters.…”

“…It was concluded that the current TPRD diameters may result in a significantly dangerous situation in underventilated enclosures. The heat transfer mechanisms (radiation and conduction) has been investigated (Hussein et al, 2018). The assumption of adiabatic walls showed high over predictions compared to simulations where both radiation and conduction were included.…”

A comparative study of radiation models on propane jet fires based on experimental and computational studies

“… Propane Vertical Evaluated the influence of the jet fire due to gas discharge. Hussein et al. (2018) CFD code.…”