Experimental Study of the Diffusion Combustion of a High-Speed Round Hydrogen Microjet. Part 1. Attached Flame, Subsonic Flow

Козлов, В. В.; Grek, G. R.; Litvinenko, M. V.; Litvinenko, Yu. А.; Шмаков, А. Г.; Ras, Combustion Sb

doi:10.25205/2541-9447-2017-12-2-28-45

Cited by 6 publications

(5 citation statements)

References 4 publications

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“…Termination of combustion in the turbulent section of microjet, the latter still burning in the "bottle-neck" region. In this case, combustion proceeds in the "bottle-neck" configuration up to transonic velocities of the microjet, however nozzle blocking becomes pronounced at U0 > 331 m/s [5,6]. Combustion of the microjet stops at about U0 = 331 m/s.…”

Section: Introductionmentioning

confidence: 94%

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Scenarios of combustion of plane hydrogen microjets at sub- and supersonic velocities

Katasonov,

Kozlov,

Litvinenko

et al. 2023

E3S Web Conf.

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Experimental data on diffusion combustion of plane hydrogen microjets emanating from a slotted micronozzle at subsonic and supersonic velocities are reported. Four scenarios of diffusion combustion of the hydrogen microjets are presented. As is found, the stabilization of subsonic combustion of the hydrogen microjet is related to the origination of a “bottle-neck” configuration of flame while in supersonic conditions the flow pattern is dominated by supersonic cells. Hysteresis of the diffusion combustion of plane hydrogen microjet is found depending on its ignition far from or close to the nozzle exit and velocity variation.

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Section: Introductionmentioning

confidence: 94%

“…Experimental data on diffusion combustion of circular microjets reported in refs. [1][2][3][4][5] testified to different behavior of the microjets emanating from round micronozzles at their diameter ranging from 0.25 to 1.00 mm. As a result, four scenarios of the microjet combustion were observed.…”

Section: Introductionmentioning

confidence: 99%

Scenarios of combustion of plane hydrogen microjets at sub- and supersonic velocities

Katasonov,

Kozlov,

Litvinenko

et al. 2023

E3S Web Conf.

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“…V. Kozlov 1,3 , G. R. Grek 1 , M. V. Litvinenko 1, 2 Yu. А. Litvinenko 1 , A. S. Tambovzev 1,2 , A. G. Shmakov 3,4 Введение Экспериментальные исследования диффузионного горения круглой микроструи водорода [1][2][3][4][5] показали наличие различных сценариев протекания данного процесса в зависимости от нарастания скорости истечения микроструи в диапазоне диаметров выходного отверстия от 0,25 до 1 мм. Обнаружены следующие сценарии диффузионного горения круглой микроструи водорода.…”

Section: Air Round Microjet Interaction With Coaxial Hydrogen Jet At unclassified

“…рис. 2, b, g), детальные исследования которой представлены в работах [1][2][3][4][5], но при горении круглых и плоских микроструй. Однако в данной ситуации мы наблюдаем возникновение области перетяжки пламени при горении коаксиальной струи, т. е. струи, представляющей собой полый цилиндр со всеми особенностями трансформации его пламени в данной области в некую специфическую геометрическую форму.…”

Section: результаты экспериментовunclassified

“…Обнаружено, что горение коаксиальной (спутной) струи водорода c ростом скорости ее истечения сопровождается всеми сценариями, наблюдаемые в работах [1][2][3][4][5] при исследовании диффузионного горения круглой и плоской микроструй водорода. Однако область перетяжки пламени претерпевает значительные геометрические деформации из-за специфики пламени коаксиальной струи.…”

Section: заключениеunclassified

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Air Round Microjet Interaction with Coaxial Hydrogen Jet at It Combustion for Supersonic Speed Jets Efflux

Козлов

Grek

Litvinenko

et al. 2019

SJPhys

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Results of experimental studies of the round air microjet interaction with a coaxial hydrogen jet at its combustion for supersonic speed jets efflux are presented in this work. It is revealed that combustion of the coaxial hydrogen jet with growth of its speed efflux is accompanied by all scenarios, observed at study of the round and plane hydrogen microjets diffusion combustion. However, “bottleneck flame region” undergoes considerable geometrical deformations because of specifics of a flame of a coaxial jet. It is shown that “bottleneck flame region” is transformed from Y-shaped to spherical shape in the activity of growth of a coaxial jet speed efflux. It is found that a round air microjet interaction with a coaxial hydrogen jet at its combustion is accompanied by several new phenomena: existence of cone-shaped area a coaxial jet combustion near a nozzle exit; existence of small-scale supersonic cells on a resultant flame; absence of the hydrogen combustion efflux from combustion region of a coaxial jet near nozzle exit; flame-out from combustion region of a coaxial jet near nozzle exit that leads to hydrogen ignition downstream, its intensive combustion and sharp acoustic noise occurrence; existence of a turbulent flame, to its separation from a nozzle exit and transition to supersonic combustion of a resultant jet.

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Diffusion combustion of plane hydrogen microjet emanating from a micronozzle at subsonic and supersonic velocities

Козлов

Grek

Litvinenko

et al. 2019

HIGH-ENERGY PROCESSES IN CONDENSED MATTER (HEPCM 2019): Proceedings of the XXVI Conference on High-Energy Processes in Condense

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Experimental Study of the Diffusion Combustion of a High-Speed Round Hydrogen Microjet. Part 1. Attached Flame, Subsonic Flow

Cited by 6 publications

References 4 publications

Scenarios of combustion of plane hydrogen microjets at sub- and supersonic velocities

Scenarios of combustion of plane hydrogen microjets at sub- and supersonic velocities

Air Round Microjet Interaction with Coaxial Hydrogen Jet at It Combustion for Supersonic Speed Jets Efflux

Diffusion combustion of plane hydrogen microjet emanating from a micronozzle at subsonic and supersonic velocities

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