Direct Numerical Simulations for the Effects of Small Perturbation on the Intrinsic Instabilities of Two-dimensional Hydrogen/air Premixed Flames
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- TSUBOI Kazuya
- Tohoku University
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- MASUYA Goro
- Tohoku University
Bibliographic Information
- Other Title
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- 二次元水素-空気予混合火炎の固有不安定におよぼす微小擾乱の影響に関する直接数値シミュレーション
- 2ジゲン スイソ クウキ ヨ コンゴウ カエン ノ コユウ フアンテイ ニ オヨボス ビショウ ジョウラン ノ エイキョウ ニ カンスル チョクセツ スウチ シミュレーション
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Abstract
<p>Direct numerical simulations were implemented and studied for the intrinsic instabilities of two-dimensional hydrogen/air premixed planar flames. The 6th-order compact finite difference scheme was used for the spatial discretization, and the 3rd-order Runge-Kutta method for the time advancement. The boundary conditions were based on the Navier-Stokes characteristic boundary conditions. The hydrogen/air detailed kinetics, which contains 9 species and 35 elementary reactions, was used. Small perturbation was imposed at the upstream boundary of the calculation domain (a rectangle), and then the perturbation grew up when it reached a planar flame. The flame became unstable due to the intrinsic instabilities. Afterwards, a cusp, which was a concave part towards the unburned gas, appeared, and developed rapidly. It is considered to be due to the diffusive-thermal instability. And then, the cusp was closing, while a convex part towards the unburned gas appeared. This is considered as a cellular structure. The dispersion relation between the wave number and the growth rate of the perturbation was obtained and compared with a theoretical prediction. The behaviour of the flame was qualitatively similar to one obtained in past experiments. Furthermore the results with the perturbation imposed continuously and in a limited time were compared.</p>
Journal
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- Journal of the Combustion Society of Japan
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Journal of the Combustion Society of Japan 45 (133), 184-190, 2003
Combustion Society of Japan
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Details 詳細情報について
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- CRID
- 1390564227326470528
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- NII Article ID
- 10017023620
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- NII Book ID
- AA11658490
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- ISSN
- 24241687
- 13471864
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- NDL BIB ID
- 6717749
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- CiNii Articles
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- Abstract License Flag
- Disallowed