Self-Ignition of Hydrogenous Mixtures

Gel’fand, B. E.; Silnikov, М.V.; Medvedev, S. P.; Khomik, S. V.

doi:10.1007/978-3-642-25352-2_6

Cited by 3 publications

(2 citation statements)

References 53 publications

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“…The critical conditions and mechanisms of hydrogen oxidation are explained in the theory of chain reactions by the competition of the reactions of branching and termination of chains [8][9][10][11]. One of the most important consequences of this theory is the existence of hydrogen-oxygen explosion limits in a temperature-pressure plane [9] and the complex functional dependence of the ignition delay time on the pressure and temperature of the reaction mixture [12].…”

Section: Introductionmentioning

confidence: 99%

Ignition Delay and Reaction Time Measurements of Hydrogen–Air Mixtures at High Temperatures

Baranyshyn,

Kuzmitski,

Penyazkov

et al. 2024

Fire

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Induction and reaction times of hydrogen–air mixtures (ϕ = 0.5–2) have been measured behind reflected shock waves at temperatures of 1000–1600 K, pressures of 0.1, 0.3, 0.6 MPa in the domain of the extended second explosion limit. The measurements were performed in the shock tube with a completely transparent test section of 0.5 m long, which provides pressure, ion current, OH and high-speed chemiluminescence observations. The experimental induction time plots demonstrate a clear increasing of the global activation energy from high- to low temperature post-shock conditions. This trend is strongly pronounced at higher post-shock pressures. For a high-temperature range of T > 1200 K, induction time measurements show an activation energy for the global reaction rate of hydrogen oxidation of 64–83 kJ/mole. Detected reaction times exhibit a big scatter and a weak temperature dependence. The minimum reaction time value was nearly 2 µs. Obtained induction time data were compared with calculations carried out in accordance with the known kinetic mechanisms. For current and former shock-tube experiments within a pressure range of 0.1–2 MPa, critical temperatures required for strong (1000–1100 K), transient and weak auto-ignition modes behind reflected shock waves were identified by means of the pressure and ion-probe measurements in stoichiometric hydrogen-air mixture. The transfer from the strong volumetric self-ignition near the reflecting wall to the hot spot ignition (transient) was established and visualized below <1200 K with a post-shock temperature decreasing.

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Section: Introductionmentioning

confidence: 99%

Ignition Delay and Reaction Time Measurements of Hydrogen–Air Mixtures at High Temperatures

Baranyshyn,

Kuzmitski,

Penyazkov

et al. 2024

Fire

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“…The analogous effects of formation of movable triple configurations at the shock reflection are well-known (Bazhenova and Gvozdeva, 1977;Arutyunyan and Karchevsky, 1973 stationary configurations at the Mach reflection of compression shocks in the supersonic jets (Omel'chenko et al, 2003; Hadjadj model of triple configurations of shock studied in detail by V. Uskov scientific school ( et al, 1995;Uskov and Mostovykh, 2008 that the triple configurations can be extreme under some gas-dynamic parameters (Tao and Chernyshov, 2006), including under the rate of velocity head following them, which is actually for study of the ways of protection against the shock effect (Gelfand and Silnikov, 2006).…”

Section: Introductionmentioning

confidence: 99%

Spherical Shock-wave-2D Surface Interaction

Bulat¹,

Silnikov²,

Chernyshev³

2015

RJASET

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The purpose of research is the study of the transformation of the shock reflection of a spherical shock wave from a flat surface. to formation of shock-wave triple configuration. In spite of static pressure equality of gas streams after the different wave sequences, the velocities, densities and other flow parameters are not equal. In view of the fact that flow velocities are sufficiently different, wind loads on ob wave hazard degree (in particular, for human organism at body translation) depends on both object and HE charge blast height. The mathematical model to calculate and analyze the propagating s occurring at the heightened blast is provided in this study. The model is useful for calculation and comparison of the velocities and dynamic pressures of the streams behind the different sequences of shock waves in the trip configuration, i.e., it allows us to estimate the basic parameters characterizing the tertiary blast wave hazards

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A closed-cycle hydrogen combustion system with Stirling engine for AUV propulsion

Paik

2015

OCEANS 2015 - Genova

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Self-Ignition of Hydrogenous Mixtures

Cited by 3 publications

References 53 publications

Ignition Delay and Reaction Time Measurements of Hydrogen–Air Mixtures at High Temperatures

Ignition Delay and Reaction Time Measurements of Hydrogen–Air Mixtures at High Temperatures

Spherical Shock-wave-2D Surface Interaction

A closed-cycle hydrogen combustion system with Stirling engine for AUV propulsion

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