TY - JOUR

T1 - Combustion of Round Hydrogen Microjet in Concurrent Flow

AU - Kozlov, V. V.

AU - Litvinenko, M. V.

AU - Litvinenko, Yu A.

AU - Pavlenko, A. M.

AU - Tambovtsev, A. S.

AU - Shmakov, A. G.

N1 - Funding Information: This work was supported by the RF Ministry of Education and Science, Agreement no. 075-15-2020-806 (contract no. 13.1902.21.0014) Publisher Copyright: © 2021, Pleiades Publishing, Ltd.

PY - 2021/4

Y1 - 2021/4

N2 - Experimental data on the diffusion combustion of a round hydrogen microjet in a concurrent coaxial flow are presented. The effects on the combustion of a concurrent air flow and an air flow premixed with nanopowder of TiO2 are of interest. The hydrogen microjet emanates from a round micronozzle, which is surrounded by a coaxial slit to produce the concurrent flow. Combustion events found in these conditions are similar to those observed in the previous studies on the diffusion combustion of hydrogen microjets at subsonic and supersonic velocities. In a subsonic range, the so-called “bottleneck-flame region” is generated close to the nozzle exit, while in high-speed conditions, the flame separates from the nozzle. At increasing velocity of both the hydrogen microjet and the concurrent flow, the “bottleneck-flame region” is still found and the combustion becomes more intense. The “bottleneck-flame region” is suppressed at the microjet velocity approaching transonic values.

AB - Experimental data on the diffusion combustion of a round hydrogen microjet in a concurrent coaxial flow are presented. The effects on the combustion of a concurrent air flow and an air flow premixed with nanopowder of TiO2 are of interest. The hydrogen microjet emanates from a round micronozzle, which is surrounded by a coaxial slit to produce the concurrent flow. Combustion events found in these conditions are similar to those observed in the previous studies on the diffusion combustion of hydrogen microjets at subsonic and supersonic velocities. In a subsonic range, the so-called “bottleneck-flame region” is generated close to the nozzle exit, while in high-speed conditions, the flame separates from the nozzle. At increasing velocity of both the hydrogen microjet and the concurrent flow, the “bottleneck-flame region” is still found and the combustion becomes more intense. The “bottleneck-flame region” is suppressed at the microjet velocity approaching transonic values.

UR - http://www.scopus.com/inward/record.url?scp=85111706902&partnerID=8YFLogxK

U2 - 10.1134/S1810232821020053

DO - 10.1134/S1810232821020053

M3 - Article

AN - SCOPUS:85111706902

VL - 30

SP - 213

EP - 224

JO - Journal of Engineering Thermophysics

JF - Journal of Engineering Thermophysics

SN - 1810-2328

IS - 2

ER -