Flame front dynamics studies at deflagration-to-detonation transition in a cylindrical tube at low-energy initiation mode

Baranyshyn, Y. A.; Krivosheyev, P. N.; Penyazkov, O. G.; Sevrouk, K. L.

doi:10.1007/s00193-020-00937-0

Cited by 17 publications

(2 citation statements)

References 10 publications

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“…Then, the non-flat reaction region propagated with subsequent acceleration and deflagration to detonation transition (DDT) occurred. In this case, the near-wall effects (boundary layer and its interaction with additional compression waves) can influence the self-ignition and DDT [26,27].…”

Section: Resultsmentioning

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: Resultsmentioning

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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“…this guaranteed high temporal and spatial resolution of the process observed. A detailed description of the test stand and test can be found in [9,21]. they found that just before the DDt, the turbulent flame had a conical structure and that the ignition points, "hot spots", which trigger the DDt are always located at the annular boundary layer 6-35 mm ahead of the cone flame.…”

Section: -D Visualization Of the Ddtmentioning

confidence: 99%

The Contribution of A. K. Oppenheim to Explaining the Nature of the Initiation of Gaseous Detonation in Tubes

Kuhl

Hayashi

Wolański

2022

Transactions on Aerospace Research

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This paper analyzes A.K. Oppenheim’s original works on the transition of deflagration to detonation and reviews them from the perspective of new numerical and experimental results recently obtained on such phenomena. Particular attention is focused on processes happening in the boundary layer of the tube walls ahead of the accelerating flame. The results of the theoretical analyses of temperature variations inside developing boundary layer are presented and compared to the temperature variation in a free stream away from the boundary layer. Analyses of temperature increase in such layers clearly indicate that the self-ignition of the mixture happens in the boundary layer ahead of the propagating flame front. New experimental results obtained recently by a research group from the A. V. Luikov Heat and Mass Transfer Institute in Minsk, Belarus, combined with previously conducted theoretical analyses and numerical simulations, show clearly and unambiguously that the origin of the “explosion in the explosion”, postulated by A. K. Oppenheim in 1966, is always responsible for the Deflagration-Detonation Transition (DDT) in gases and is located in the boundary layer ahead of the accelerating flame front.

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Detonative Propulsion

Wolański

Kawalec

Benkiewicz

2023

Green Energy and Technology

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Flame front dynamics studies at deflagration-to-detonation transition in a cylindrical tube at low-energy initiation mode

Cited by 17 publications

References 10 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

The Contribution of A. K. Oppenheim to Explaining the Nature of the Initiation of Gaseous Detonation in Tubes

Detonative Propulsion

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