Effect of inert and reactive gases on stability of high-speed hydrogen micro jet flame

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Abstract

Experimental data are presented on the effect of inert (He, N2, Ar, CO2) and reactive (SH4, O2, CF3Br, (CH3O)3PO) gas additives to hydrogen flow and ambient air on flame separation during diffusion combustion of a hydrogen microjet emanating from a round micronozzle into air. The micronozzle is a stainless steel tube with an inner diameter of 0.5 mm, a length of 30 mm, and a wall thickness of 0.1 mm. The shadow method is used to determine the critical hydrogen velocity at which the flame of the hydrogen microjet separates from the nozzle upon injection of additives into air and into the hydrogen flow. It is found that the addition of the above gases to hydrogen narrows the microjet velocity range in which stabilization of the flame can be achieved with injection of both inert and reactive additives. For the hydrogen flow with the additives studied, the critical velocity of flame separation from the micronozzle depends primarily on the mean molecular weight of the gas mixture. In the case of the addition of the gases to the air surrounding the diffusion flame, the critical velocity of flame separation is determined by their effect on the chemical reactions of hydrogen oxidation (inhibiting effect) and by the reduction of oxygen concentration due to air dilution with the additive. The results could be of interest to experts in hydrogen energetics for determining the conditions of stable hydrogen microjet combustion and the minimum concentrations of flame-suppressing additives to air preventing the ignition and combustion of hydrogen after its accidental release.

Original languageEnglish
Title of host publicationInternational Conference on Physics and Chemistry of Combustion and Processes in Extreme Environments, ComPhysChem 20-21 and VI International Summer School "Modern Quantum Chemistry Methods in Applications"
EditorsValeriy N. Azyazov, Alexander M. Mebel
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735440401
DOIs
Publication statusPublished - 8 Dec 2020
Event2nd International Conference on Physics and Chemistry of Combustion and Processes in Extreme Environments, ComPhysChem 20-21 and 6th International Summer School on Modern Quantum Chemistry Methods in Applications - Samara, Russian Federation
Duration: 26 Jul 202130 Jul 2021

Publication series

NameAIP Conference Proceedings
Volume2304
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference2nd International Conference on Physics and Chemistry of Combustion and Processes in Extreme Environments, ComPhysChem 20-21 and 6th International Summer School on Modern Quantum Chemistry Methods in Applications
CountryRussian Federation
CitySamara
Period26.07.202130.07.2021

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