Unstable behaviors of cellular premixed flames caused by hydrodynamic and diffusive-thermal instabilities under high- and low-temperature environment
Unstable behaviors of cellular premixed flames caused by hydrodynamic and diffusive-thermal instabilities under high- and low-temperature environment were studied numerically. Unsteady reactive flow was calculated in large space, based on the compressible Navier-Stokes equation including chemical re...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | Japanese |
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The Japan Society of Mechanical Engineers
2016-02-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/82/835/82_15-00522/_pdf/-char/en |
| _version_ | 1811221188826890240 |
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| author | Satoshi KADOWAKI Taisuke WASHIO Thwe Thwe Aung Wataru YAMAZAKI Toshiyuki KATSUMI Hideaki KOBAYASHI |
| author_facet | Satoshi KADOWAKI Taisuke WASHIO Thwe Thwe Aung Wataru YAMAZAKI Toshiyuki KATSUMI Hideaki KOBAYASHI |
| author_sort | Satoshi KADOWAKI |
| collection | DOAJ |
| description | Unstable behaviors of cellular premixed flames caused by hydrodynamic and diffusive-thermal instabilities under high- and low-temperature environment were studied numerically. Unsteady reactive flow was calculated in large space, based on the compressible Navier-Stokes equation including chemical reaction. As the unburned-gas temperature became higher (lower), the growth rate increased (decreased) and the unstable range widened (narrowed), which was due to the enlargement (reduction) of the burning velocity of a planar flame. On the other hand, the normalized growth rate decreased (increased) and the normalized unstable range narrowed (widened) under the high (low) temperature conditions. This was due to the weakness (strength) of thermal-expansion effects and to the reduction (enlargement) of Zeldovich numbers. Furthermore, unstable behaviors of cellular flames, i.e. the coalescence and divide of cells, appeared owing to hydrodynamic and diffusive-thermal instabilities. We found that the burning velocity of a cellular flame changed drastically with time, and the average burning velocity of a cellular flame normalized by that of a planar flame decreased (increased) as the unburned-gas temperature became higher (lower). In addition, the burning velocity of a cellular flame depended strongly on the space size. As the space size became larger, the burning velocity increased monotonously. This was because that the long-wavelength components of disturbances played a significant role in the dynamics of cellular premixed flames. |
| first_indexed | 2024-04-12T07:55:01Z |
| format | Article |
| id | doaj.art-f001cfd5d0e74b4a9c188f77e48ec966 |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-12T07:55:01Z |
| publishDate | 2016-02-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-f001cfd5d0e74b4a9c188f77e48ec9662022-12-22T03:41:30ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612016-02-018283515-0052215-0052210.1299/transjsme.15-00522transjsmeUnstable behaviors of cellular premixed flames caused by hydrodynamic and diffusive-thermal instabilities under high- and low-temperature environmentSatoshi KADOWAKI0Taisuke WASHIO1Thwe Thwe Aung2Wataru YAMAZAKI3Toshiyuki KATSUMI4Hideaki KOBAYASHI5Department of System Safety, Nagaoka University of TechnologyDepartment of Mechanical Engineering, Nagaoka University of TechnologyDepartment of Mechanical Engineering, Nagaoka University of TechnologyDepartment of Mechanical Engineering, Nagaoka University of TechnologyDepartment of Mechanical Engineering, Nagaoka University of TechnologyInstitute of Fluid Science, Tohoku UniversityUnstable behaviors of cellular premixed flames caused by hydrodynamic and diffusive-thermal instabilities under high- and low-temperature environment were studied numerically. Unsteady reactive flow was calculated in large space, based on the compressible Navier-Stokes equation including chemical reaction. As the unburned-gas temperature became higher (lower), the growth rate increased (decreased) and the unstable range widened (narrowed), which was due to the enlargement (reduction) of the burning velocity of a planar flame. On the other hand, the normalized growth rate decreased (increased) and the normalized unstable range narrowed (widened) under the high (low) temperature conditions. This was due to the weakness (strength) of thermal-expansion effects and to the reduction (enlargement) of Zeldovich numbers. Furthermore, unstable behaviors of cellular flames, i.e. the coalescence and divide of cells, appeared owing to hydrodynamic and diffusive-thermal instabilities. We found that the burning velocity of a cellular flame changed drastically with time, and the average burning velocity of a cellular flame normalized by that of a planar flame decreased (increased) as the unburned-gas temperature became higher (lower). In addition, the burning velocity of a cellular flame depended strongly on the space size. As the space size became larger, the burning velocity increased monotonously. This was because that the long-wavelength components of disturbances played a significant role in the dynamics of cellular premixed flames.https://www.jstage.jst.go.jp/article/transjsme/82/835/82_15-00522/_pdf/-char/enpremixed combustioncellular flameintrinsic instabilityhigh and low temperatureburning velocity |
| spellingShingle | Satoshi KADOWAKI Taisuke WASHIO Thwe Thwe Aung Wataru YAMAZAKI Toshiyuki KATSUMI Hideaki KOBAYASHI Unstable behaviors of cellular premixed flames caused by hydrodynamic and diffusive-thermal instabilities under high- and low-temperature environment Nihon Kikai Gakkai ronbunshu premixed combustion cellular flame intrinsic instability high and low temperature burning velocity |
| title | Unstable behaviors of cellular premixed flames caused by hydrodynamic and diffusive-thermal instabilities under high- and low-temperature environment |
| title_full | Unstable behaviors of cellular premixed flames caused by hydrodynamic and diffusive-thermal instabilities under high- and low-temperature environment |
| title_fullStr | Unstable behaviors of cellular premixed flames caused by hydrodynamic and diffusive-thermal instabilities under high- and low-temperature environment |
| title_full_unstemmed | Unstable behaviors of cellular premixed flames caused by hydrodynamic and diffusive-thermal instabilities under high- and low-temperature environment |
| title_short | Unstable behaviors of cellular premixed flames caused by hydrodynamic and diffusive-thermal instabilities under high- and low-temperature environment |
| title_sort | unstable behaviors of cellular premixed flames caused by hydrodynamic and diffusive thermal instabilities under high and low temperature environment |
| topic | premixed combustion cellular flame intrinsic instability high and low temperature burning velocity |
| url | https://www.jstage.jst.go.jp/article/transjsme/82/835/82_15-00522/_pdf/-char/en |
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