Interaction of the combustion front of methane-air mixture at low pressures with obstacles of cylindrical shape
It was experimentally observed that the front of a propagating flame of a well-mixed diluted methane-oxygen mixture at 298 K and 100–300 Torr does not form von Karman vortex shedding behind the obstacle of cylindrical shape of 30–50 mm in diameter, including a perforated cylinder; however, the insta...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co. Ltd.
2021-09-01
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| Series: | FirePhysChem |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2667134421000298 |
| _version_ | 1797976351274172416 |
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| author | Nickolai M. Rubtsov Victor I. Chernysh Georgii I. Tsvetkov Kirill Ya. Troshin |
| author_facet | Nickolai M. Rubtsov Victor I. Chernysh Georgii I. Tsvetkov Kirill Ya. Troshin |
| author_sort | Nickolai M. Rubtsov |
| collection | DOAJ |
| description | It was experimentally observed that the front of a propagating flame of a well-mixed diluted methane-oxygen mixture at 298 K and 100–300 Torr does not form von Karman vortex shedding behind the obstacle of cylindrical shape of 30–50 mm in diameter, including a perforated cylinder; however, the instability under the same conditions occurs in the flow of hot products. In the perforated cylinder, the occurrence of local primary ignition centers on its inner surface is observed. In the mathematical modeling, the main observed features of the flame front propagation were taken into account: the chain branched mechanism of gaseous combustion and the absence of vortex shedding behind the obstacle at flame propagation. It was shown that a qualitative model of compressible dimensionless non-reactive/reactive Navier–Stokes equations in low Mach number approximation yields both the mode of the emergence of von Karman instability in chemically inert gas and the absence of the instability in the mode of flame propagation in a reacting flow. The model computations confirmed the occurrence of local primary ignition centers on the inner surface of the obstacle. |
| first_indexed | 2024-04-11T04:49:33Z |
| format | Article |
| id | doaj.art-10213589b679429597aba1959c3a10a1 |
| institution | Directory Open Access Journal |
| issn | 2667-1344 |
| language | English |
| last_indexed | 2024-04-11T04:49:33Z |
| publishDate | 2021-09-01 |
| publisher | KeAi Communications Co. Ltd. |
| record_format | Article |
| series | FirePhysChem |
| spelling | doaj.art-10213589b679429597aba1959c3a10a12022-12-27T04:40:38ZengKeAi Communications Co. Ltd.FirePhysChem2667-13442021-09-0113174178Interaction of the combustion front of methane-air mixture at low pressures with obstacles of cylindrical shapeNickolai M. Rubtsov0Victor I. Chernysh1Georgii I. Tsvetkov2Kirill Ya. Troshin3Dr of Sciences, Merzhanov Institute of Structural Macrokinetics and material Science RAS Chernogolovka, Moscow Region RUSSIAN FEDERATION; Corresponding author.Dr of Sciences, Merzhanov Institute of Structural Macrokinetics and material Science RAS Chernogolovka, Moscow Region RUSSIAN FEDERATIONDr of Sciences, Merzhanov Institute of Structural Macrokinetics and material Science RAS Chernogolovka, Moscow Region RUSSIAN FEDERATIONDr of Sci, N.N. Semenov Federal research Center for Chemical Physics RASIt was experimentally observed that the front of a propagating flame of a well-mixed diluted methane-oxygen mixture at 298 K and 100–300 Torr does not form von Karman vortex shedding behind the obstacle of cylindrical shape of 30–50 mm in diameter, including a perforated cylinder; however, the instability under the same conditions occurs in the flow of hot products. In the perforated cylinder, the occurrence of local primary ignition centers on its inner surface is observed. In the mathematical modeling, the main observed features of the flame front propagation were taken into account: the chain branched mechanism of gaseous combustion and the absence of vortex shedding behind the obstacle at flame propagation. It was shown that a qualitative model of compressible dimensionless non-reactive/reactive Navier–Stokes equations in low Mach number approximation yields both the mode of the emergence of von Karman instability in chemically inert gas and the absence of the instability in the mode of flame propagation in a reacting flow. The model computations confirmed the occurrence of local primary ignition centers on the inner surface of the obstacle.http://www.sciencedirect.com/science/article/pii/S2667134421000298Methane combustionInstabilityVon Karman vortex streetObstacle of cylindrical shapeMathematical model |
| spellingShingle | Nickolai M. Rubtsov Victor I. Chernysh Georgii I. Tsvetkov Kirill Ya. Troshin Interaction of the combustion front of methane-air mixture at low pressures with obstacles of cylindrical shape FirePhysChem Methane combustion Instability Von Karman vortex street Obstacle of cylindrical shape Mathematical model |
| title | Interaction of the combustion front of methane-air mixture at low pressures with obstacles of cylindrical shape |
| title_full | Interaction of the combustion front of methane-air mixture at low pressures with obstacles of cylindrical shape |
| title_fullStr | Interaction of the combustion front of methane-air mixture at low pressures with obstacles of cylindrical shape |
| title_full_unstemmed | Interaction of the combustion front of methane-air mixture at low pressures with obstacles of cylindrical shape |
| title_short | Interaction of the combustion front of methane-air mixture at low pressures with obstacles of cylindrical shape |
| title_sort | interaction of the combustion front of methane air mixture at low pressures with obstacles of cylindrical shape |
| topic | Methane combustion Instability Von Karman vortex street Obstacle of cylindrical shape Mathematical model |
| url | http://www.sciencedirect.com/science/article/pii/S2667134421000298 |
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