Study of the Regimes of Diffusive Combustion of a Hydrogen Microjet
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The paper presents the results of experimental studies of scenarios of diffusion combustion of a microjet of hydrogen flowing out of a cylindrical micronozzle with a diameter of 200 μm. The hydrogen microjet is ignited near the nozzle exit and at a distance. The experimental data are compared with the data previously obtained, and the results are expressed in dimensionless parameters (in terms of Reynolds numbers). It is established that the stabilization of flame during the outflow of a circular micro jet of hydrogen is associated with the presence of heating of the nozzle by a spherical flame region covering the nozzle section. The hysteresis of the diffusion combustion process of circular hydrogen microjets is shown depending on the ignition location of the microjet (near or far from the nozzle exit) and the change in the flow rate (growth or decrease).
Keywords
round microjet of hydrogen, diffusion combustion, inflammation, mechanisms of combustion
Funding
This research was supported by the Russian Science Foundation (RSF) project No. 22-19-00151, https://rscf.ru/22-19- 00151/.
УДК 532.525.5
Study of the Regimes of Diffusive Combustion of a Hydrogen Microjet
The material was received by the Editorial Board: 15.07.2022
Abstract The paper presents the results of experimental studies of scenarios of diffusion combustion of a microjet of hydrogen flowing out of a cylindrical micronozzle with a diameter of 200 μm. The hydrogen microjet is ignited near the nozzle exit and at a distance. The experimental data are compared with the data previously obtained, and the results are expressed in dimensionless parameters (in terms of Reynolds numbers). It is established that the stabilization of flame during the outflow of a circular micro jet of hydrogen is associated with the presence of heating of the nozzle by a spherical flame region covering the nozzle section. The hysteresis of the diffusion combustion process of circular hydrogen microjets is shown depending on the ignition location of the microjet (near or far from the nozzle exit) and the change in the flow rate (growth or decrease).
Keywords
round microjet of hydrogen, diffusion combustion, inflammation, mechanisms of combustion
Funding
This research was supported by the Russian Science Foundation (RSF) project No. 22-19-00151, https://rscf.ru/22-19- 00151/.
УДК 532.525.5
Study of the Regimes of Diffusive Combustion of a Hydrogen Microjet References: Kozlov V. V., Litvinenko M. V., Litvinenko Yu. А., Tambovtsev A. S., Shmakov A. G. Study of the Regimes of Diffusive Combustion of a Hydrogen Microjet. Siberian Journal of Physics. 2022, vol. 17, no. 3. P. 12–21 (in Russ.). DOI: 10.25205/2541-9447-2022-17-3-12-21