The Instability of Flame Fronts in Premixed Combustion of Low-Temperature Gases (Effects of Unburned-Gas Temperature)
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- AOKI Yusuke
- 長岡技術科学大学大学院工学研究科機械創造工学専攻
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- YAMAZAKI Wataru
- 長岡技術科学大学産学融合トップランナー
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- KADOWAKI Satoshi
- Nagaoka University of Technology, Department of System Safety
Bibliographic Information
- Other Title
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- 低温ガスの予混合燃焼における火炎面の固有不安定性(未燃ガス温度の影響)
Abstract
We performed two-dimensional unsteady calculations of reactive flows, based on the compressible N-S equation, to study the effects of unburned-gas temperature on the instability of flame fronts. As the unburned-gas temperature became lower, the growth rate decreased and the unstable range narrowed. This was due mainly to the reduction of the burning velocity of a planar flame. The normalized growth rate increased with a decrease of the unburned-gas temperature, and the normalized unstable range widened at Lewis numbers smaller than unity. This was because that the thermal-expansion effects became stronger owing to the increase of the temperature ratio of burned and unburned gases, and that the diffusive-thermal effects strengthened at Lewis numbers smaller than unity owing to the increase of the Zeldovich number. Moreover, the cellular shape of flame fronts formed, which was due to intrinsic instability. The normalized burning velocity of a cellular flame increased as the unburned-gas temperature became lower, especially in premixed flames with small Lewis numbers.
Journal
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- TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
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TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B 79 (803), 1391-1395, 2013
The Japan Society of Mechanical Engineers
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Details 詳細情報について
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- CRID
- 1390001206261779840
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- NII Article ID
- 130003374866
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- ISSN
- 18848346
- 03875016
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- Text Lang
- ja
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed