Burning rate estimation based on flame evolution in a channel

Yakovenko, I. S.; Киверин, А. Д.; Krivosheyev, P. N.; Kuzmitski, Viachaslau; Navitski, Aliaksei; Penyazkov, O. G.; Tyurnin, Alexey; Yarkov, Andrey

doi:10.1016/j.actaastro.2022.10.036

Cited by 7 publications

(1 citation statement)

References 49 publications

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“…It was shown that at least the initial stages of flame evolution are similar in different channels, and one can use scales normalized by channel width (such as x/H or u f t/H) when analyzing the dynamics of the flame. Furthermore, this was also justified experimentally in [21]. According to this, one can use direct numerical simulations of flame propagation through a relatively narrow channel to obtain information on whether the flame can accelerate or not.…”

Section: Problem Setupmentioning

confidence: 72%

On the Critical Condition for Flame Acceleration in Hydrogen-Based Mixtures

2023

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The paper presents a novel numerical approach to the quantitative estimation of the concentration limits for flame acceleration in hydrogen-based mixtures. A series of calculations are carried out for hydrogen–air and hydrogen–oxygen flames in channels. The analysis of the obtained numerical results provided the value of 11 ± 0.25 % hydrogen content in the mixture as a lean concentration limit of flame acceleration that agrees well with the available experimental data. Moreover, the basic physical mechanism responsible for the transition from the steady mode of flame propagation to the accelerated one is distinguished. The mechanism is related to flame stretching in the region of interaction with the boundary layer and the competition between the joint increase in burning rate and heat losses. The novel technique for the estimation of concentration limits of flame acceleration presented here can be applied to assess combustion conditions inside combustors of energy and propulsion systems fed with hydrogen. The results are also useful in estimating explosion and fire risks in hydrogen storage, transport, and utilization facilities as parts of hydrogen energy and propulsion systems.

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Section: Problem Setupmentioning

confidence: 72%