Ignition limits of rapidly expanding diffusion layers: Application to unsteady hydrogen jets

Maxwell, Brian; Radulescu, Matei I.

doi:10.1016/j.combustflame.2011.03.001

Cited by 27 publications

(5 citation statements)

References 23 publications

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“…The quenched detonation is thus a shock wave followed by a turbulent deflagration. This type of quenching has also been observed numerically for rapidly expanding diffusion layers applied to jet ignition of hydrogen [16]. The re-initiation process, however, is not so clear.…”

Section: Introductionsupporting

confidence: 57%

Investigation of Turbulent Mixing and Local Reaction Rates on Deflagration to Detonation Transition in Methane-Oxygen

Maxwell¹,

Pękalski²,

Radulescu³

2017

Preprint

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drive transverse pressure waves outward. Upon subsequent shock reflections or interactions of the transverse waves, new local explosion events occurred, which further strengthened the adjacent leading shock wave above the CJdetonation speed. Eventually, through this process, the wave sustained the CJ-detonation speed, on average, through the cyclic mechanism of local explosion events followed by turbulent surface reactions. Finally, combustion of the flame acceleration process was found to lie predominantly within the thin-reaction zones regime.

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Section: Introductionsupporting

confidence: 57%

Investigation of Turbulent Mixing and Local Reaction Rates on Deflagration to Detonation Transition in Methane-Oxygen

Maxwell¹,

Pękalski²,

Radulescu³

2017

Preprint

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show abstract

“…For these cases, the associated transient computation should account for counteracting effects of the waves generated at the initial instant (i.e., a shock wave traveling into the fresh mixture and an accompanying expansion wave that propagates upstream from the slot into the burnt mixture). Such an analysis has been carried out in a closely related conf guration by Radulescu and coworkers [44,45,46], who studied the release of pressurized hydrogen gas at room temperature into ambient air, and the shock-induced ignition of the resulting one-dimensional unsteady mixing layer of fuel and oxidizer at the jet head. However, their results can not be easily extrapolated to our analysis of def agration initiation by hot products discharge.…”

Section: Numerical Resultsmentioning

confidence: 99%

Critical slot size for deflagration initiation by hot products discharge into hydrogen–air atmospheres

Carpio

Iglesias

Vera

et al. 2017

International Journal of Hydrogen Energy

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“…This model was used to determine the changes in velocity, pressure, temperature, and density with time. Several authors [16][80][81] [84][85] [86] have studied local ignition problems during ignition of high-pressure hydrogen jets by numerical simulations. The researchers reached the conclusion that the occurrence of spontaneous ignition of the high-pressure hydrogen jet persisted even in the absence of an extension tube.…”

Section: Overview Of Experimental and Simulation Researchesmentioning

confidence: 99%

“…Several possible ignition mechanisms have been proposed to investigate the mechanism of spontaneous ignition of high-pressure leaking hydrogen [9], including inverse Joule-Thomson interaction [10,11] , electrostatic ignition [12][13][14], diffusive ignition [15], instantaneous adiabatic compression ignition [16], hot surface ignition [17][18][19][20], and mechanical friction and impact ignition [21]. Individually, none of them can provide a comprehensive explanation for all instances of spontaneous ignition resulting from hydrogen leaks.…”

Section: Diffusion Ignition Theorymentioning

confidence: 99%

Safe use of hydrogen energy: review on hydrogen self- ignition and generated hydrogen jet fire

Zhi,

Li,

Zhou

et al. 2024

Preprint

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In the fight against climate change, hydrogen is seen as a promising sustainable energy alternative to fossil fuels. However, its wider adoption has raised safety issues, particularly regarding spontaneous combustion without an external spark. To ensure safe and sustainable hydrogen use, researchers have developed a thorough research approach targeting hydrogen's potential for spontaneous combustion. Progress has been made in understanding this phenomenon within transparent extension tubes, examining various factors like tube dimensions, curvature, shape, and rupture disc properties. These studies have revealed consistent trends. Simulations have helped explain how hydrogen auto-ignites, often starting at the tube wall, especially in high-pressure situations where it interacts with hot air and expands cold fuel. Researchers have also created mathematical models related to ignition dynamics. Yet, there's limited experimental data on hydrogen jet self-ignition in open spaces. Some simulations suggest that high-pressure hydrogen can ignite spontaneously even without a confinement, but the ignition event is so brief that it's difficult to capture experimentally. Moreover, scholars are creating more accurate empirical formulas based on extensive experimental statistics that connect internal tube ignition to external jet flames. The accuracy of these empirical estimates improves as more experimental data becomes available.

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Ignition limits of rapidly expanding diffusion layers: Application to unsteady hydrogen jets

Cited by 27 publications

References 23 publications

Investigation of Turbulent Mixing and Local Reaction Rates on Deflagration to Detonation Transition in Methane-Oxygen

Investigation of Turbulent Mixing and Local Reaction Rates on Deflagration to Detonation Transition in Methane-Oxygen

Critical slot size for deflagration initiation by hot products discharge into hydrogen–air atmospheres

Safe use of hydrogen energy: review on hydrogen self- ignition and generated hydrogen jet fire

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