Experimental study on diffusion combustion of high-speed hydrogen round microjets |
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| Affiliation: | 1. Khristianovich Institute of Theoretical and Applied Mechanics of SB RAS, 630090, Novosibirsk-90, Institutskaya Str. 4/1, Russian Federation;2. Voevodsky Institute of Chemical Kinetics and Combustion of SB RAS, 630090, Novosibirsk-90, Institutskaya Str. 3, Russian Federation;3. Novosibirsk State University, 630090, Novosibirsk-90, Pirogov Str. 2, Russian Federation;1. Institute of Catalysis, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria;2. Institute for the Study of Nanostructured Materials (ISMN)-CNR, I- 90146 Palermo, Italy;3. Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Ciudad Universitaria, C.P. 04510 Mexico City, Mexico;4. Institute of Physical Chemistry, PAS, Kasprzaka 44/52, 01-224 Warsaw, Poland;5. “Ilie Murgulescu” Institute of Physical Chemistry, Romanian Academy, Bucharest 060021, Romania;1. Environmental and Energy Systems Research Division, Korea Institute of Machinery & Materials, Daejeon 305-343, Republic of Korea;2. Ship & Plant Research Team, Korean Register of Shipping, Seoul 150-871, Republic of Korea;3. Korea Maritime and Ocean University, 1, Dongsam-dong, Youngdo-gu, Busan 606-791, Republic of Korea;1. Sakarya University, Engineering Faculty, Mechanical Engineering Department, Turkey;2. Bingöl University, Engineering Faculty, Mechanical Engineering Department, Turkey;1. School of Mechanical Engineering, Beijing Institute of Technology, Beijing, 100081, China;2. School of Automotive and Transportation Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China |
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| Abstract: | Experimental data on the phenomenon of nozzle choking at diffusion combustion of a high-speed hydrogen microjet at its ignition close to the nozzle are presented. As is found, such a phenomenon is due to the nozzle heating by the «bottleneck flame region» which is generated at the origin of microjet. This flow region persists up to transonic velocities of the microjet preventing from cooling of the nozzle and the transition to supersonic speed. In the case of hydrogen ignition far from the nozzle exit in supersonic conditions, the «bottleneck flame region» is suppressed, the flame becomes detached from the nozzle which is no longer heated so that the supersonic range is attained. The subsonic combustion of hydrogen microjet is stabilized by the «bottleneck flame region» while the supersonic one becomes more stable at the generation of shock cells. The results of the present study provide new details on the combustion of hydrogen microjets and could by useful for the operation of different burners. |
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| Keywords: | Round hydrogen microjet Diffusion combustion «flame bottleneck» region Thick-walled micronozzle Heating of a nozzle |
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