Journal ArticleDOI
Shock-induced ignition of hydrogen gas during accidental or technical opening of high-pressure tanks
V. V. Golub,D. I. Baklanov,T. V. Bazhenova,M. V. Bragin,S. V. Golovastov,M. F. Ivanov,V. V. Volodin +6 more
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TLDR
In this article, a physicochemical model involving the gas-dynamic transport of a viscous gas, the kinetics of hydrogen oxidation, the multi-component diffusion, and the heat exchange is presented.Abstract:
This paper is devoted to the numerical and experimental investigation of hydrogen self-ignition as a result of the formation of a primary shock wave in front of a cold expanding hydrogen gas jet. Temperature increase, as a result of this shock wave, leads to the ignition of the hydrogen–air mixture formed on the contact surface. The required condition for hydrogen self-ignition is to maintain the high temperature in the area for a time long enough for hydrogen and air to mix and inflammation to take place. Calculations of the self-ignition of a hydrogen jet are based on a physicochemical model involving the gas-dynamic transport of a viscous gas, the kinetics of hydrogen oxidation, the multi-component diffusion, and the heat exchange. We found that the reservoir pressure range, when a shock wave formed in the air during depressurization, has sufficient intensity to produce self-ignition of the hydrogen–air mixture formed at the front of a jet of compressed hydrogen. We present an analysis of the initial conditions (the hydrogen pressure inside the vessel, the temperature of the compressed hydrogen and the surrounding air, and the diameter of the hole through which the jet was emitted), which leads to combustion.read more
Citations
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Journal ArticleDOI
Ignition of turbulent non-premixed flames
TL;DR: In this article, the initiation of turbulent non-premixed combustion of gaseous fuels through autoignition and through spark ignition is reviewed, motivated by the increasing relevance of these phenomena for new combustion technologies.
Journal ArticleDOI
Free underexpanded jets in a quiescent medium: A review
TL;DR: In this article, the authors present an exhaustive overview of the main experimental papers dealing with underexpanded jets, from those where there is clearly a lack of confidence, and some clues are given on the numerical methods that may be used if one wants to study such jets numerically, together with an emphasis on the specific thermodynamic difficulties associated to this kind of extreme conditions.
Journal ArticleDOI
Large-eddy simulation of highly underexpanded transient gas jets
Ville Vuorinen,J. Yu,Santosh Tirunagari,Ossi Kaario,Martti Larmi,Christophe Duwig,Bendiks Jan Boersma +6 more
TL;DR: In this article, the effect of nozzle pressure ratios on the characteristics of highly underexpanded jets is investigated in terms of a phase diagram revealing the shock speeds and duration of the transient stages.
Journal ArticleDOI
Self-ignition and explosion during discharge of high-pressure hydrogen
TL;DR: In this paper, a diaphragm was used to allow rapid discharge of high-pressure hydrogen, and the burst pressure was varied from 4 to 30 MPa, with the diameter of the nozzle being 5 or 10 mm.
Journal ArticleDOI
Review of hydrogen safety during storage, transmission, and applications processes
TL;DR: This study comprehensively reviews and analyses safety challenges related to hydrogen, focusing on hydrogen storage, transmission, and application processes, and approaches to quantitative risk assessment are briefly discussed.
References
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Book
Combustion: Physical and Chemical Fundamentals, Modelling and Simulation, Experiments, Pollutant Formation
TL;DR: The Navier-Stokes Equations for Three-dimensional Reacting Flows (NSFE) as discussed by the authors describe the Navier Stokes equation for three-dimensional reacting flows.
Journal ArticleDOI
Spontaneous ignition of hydrogen leaks: A review of postulated mechanisms
G.R. Astbury,S.J. Hawksworth +1 more
TL;DR: There are discrepancies between the theories, releases known to have ignited, and releases which have not ignited as discussed by the authors, and there are gaps in the knowledge of the exact ignition mechanism for releases of hydrogen, particularly at high pressures likely to be involved in future storage and use.
Journal ArticleDOI
Development of shock wave and vortex structures in unsteady jets
TL;DR: In this paper, the formation of a gaseous jet behind a sonic nozzle was studied, where a specially made two-direction shadow system was used to record side-on and head-on images of the jet, as well as a diffraction interferometer was used.
Journal ArticleDOI
Self-ignition of a fuel gas upon pulsed efflux into an oxidative medium
TL;DR: In this article, it was demonstrated that hydrogen can self-ignition when a starting shock wave, on which the temperature increases above the stagnation temperature, appears in front of a cold expanding gas jet.
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Spontaneous ignition of hydrogen leaks: A review of postulated mechanisms
G.R. Astbury,S.J. Hawksworth +1 more