Measurement of slow burning velocities and their pressure dependence using a zero-gravity method

Okajima, Satoshi; Iinuma, Kazuo; Yamaguchi, Saburo; Kumagai, S.

doi:10.1016/s0082-0784(85)80694-9

Cited by 8 publications

(2 citation statements)

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“…The magnitude of the negative pressure exponent b P of the burning velocity in the relation S L µ P bp increases as the flammability limits are approached [39]. Good agreement is found with the results of Gu et al [5].…”

Section: Pressure Effectsupporting

confidence: 87%

Characterization of the effects of pressure and hydrogen concentration on laminar burning velocities of methane–hydrogen–air mixtures

Halter

Chauveau

Chaumeix

et al. 2005

Proceedings of the Combustion Institute

359

145

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Section: Pressure Effectsupporting

confidence: 87%

Characterization of the effects of pressure and hydrogen concentration on laminar burning velocities of methane–hydrogen–air mixtures

Halter

Chauveau

Chaumeix

et al. 2005

Proceedings of the Combustion Institute

359

145

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“…2a), comparison between computation and microgravity experiments in spherically expanding flames [20,21] and tubes [22] and earth-gravity experiments specially designed for low S L [23] is more favorable without reabsorption because optically-thin conditions applied to these experiments. The discrepancy between computation and experiment is significant even though the chemistry and transport models employed predict S L away from the limits quite well [24].…”

Section: Comparison With Experimentsmentioning

confidence: 99%

Effects of radiative emission and absorption on the propagation and extinction of premixed gas flames

Masuya

Ronney

1998

Symposium (International) on Combustion

113

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Premixed gas flames in mixtures of CH 4 , O 2 , N 2 and CO 2 were studied numerically using detailed chemical and radiative emission-absorption models to establish the conditions for which radiatively-induced extinction limits may exist independent of the system dimensions. It was found that reabsorption of emitted radiation led to substantially higher burning velocities and wider extinction limits than calculations using optically-thin radiation models, particularly when CO 2 , a strong absorber, is present in the unburned gas. Two heat loss mechanisms that lead to flammability limits even with reabsorption were identified. One is that for dry hydrocarbon-air mixtures, because of the differences in the absorption spectra of H 2 O and CO 2 , most of the radiation from product H 2 O that is emitted in the upstream direction cannot be absorbed by the reactants. The second is that the emission spectrum of CO 2 is broader at flame temperatures than ambient temperature, thus some radiation emitted near the flame front cannot be absorbed by the reactants even when they are seeded with CO 2 . Via both mechanisms some net upstream heat loss due to radiation will always occur, leading to extinction of sufficiently weak mixtures. Downstream loss has practically no influence. Comparison to experiment demonstrates the importance of reabsorption in CO 2 -diluted mixtures. It is concluded that fundamental flammability limits can exist due to radiative heat loss, but these limits are strongly dependent on the emissionabsorption spectra of the reactant and product gases and their temperature dependence, and cannot be predicted using gray-gas or optically-thin model parameters. Applications to practical flames at high pressure, in large combustion chambers and with exhaust-gas or flue-gas recirculation are discussed.

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Experimental study on the characteristics of a novel aerodynamic wake width flameholder

Zhu,

Zhang,

Huang

et al. 2023

Aerospace Science and Technology

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Measurement of slow burning velocities and their pressure dependence using a zero-gravity method

Cited by 8 publications

References 0 publications

Characterization of the effects of pressure and hydrogen concentration on laminar burning velocities of methane–hydrogen–air mixtures

Characterization of the effects of pressure and hydrogen concentration on laminar burning velocities of methane–hydrogen–air mixtures

Effects of radiative emission and absorption on the propagation and extinction of premixed gas flames

Experimental study on the characteristics of a novel aerodynamic wake width flameholder

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