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We used a\nhigh-speed video camera and the Schlieren method to visualize the ignition phenomena. Experiments\nwere performed over a temperature range from 549 ± 10 to 1349 ± 11 K and a pressure range from\n56 ± 2 to 203 ± 13 kPa, and a non-diluted stoichiometric acetylene–oxygen mixture was chosen as the\ncombustible gas. We introduced a numerical simulation to help us understand the disturbed temperature\ndistribution behind bifurcated shock waves due to interference between reflected shock waves and the\nboundary layer developed behind incident shock waves. Additionally, we experimentally observed and\nevaluated quantitatively a tendency for ignition positions to be located farther from the reflecting wall\nas the temperature decreased behind reflected shock waves. To focus our attention on the ignition positions,\nwe classified the ignition types behind reflected shock waves as near-wall ignition and far-wall\nignition by 4.7 mm distance from reflecting wall. The criterion for these ignition types was estimated\nto be -1.0≦(∂ti/∂T5t)p5t≦-0.5. As a main object in this manuscript, we proposed an ignition model\nin which local ignition is induced at some distance from reflecting wall based on the numerical simulation\nand results; the local ignitions at a point distant from the reflecting wall are induced by the temperature\nrise, with the distance from the reflecting wall, immediately behind concave reflected shock waves\ndue to developing of bifurcated shock waves. 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Visualization study of ignition modes behind bifurcated-reflected shock waves
http://hdl.handle.net/2241/117847
http://hdl.handle.net/2241/11784799ba5dc7-48b2-401c-9629-e998d8df1e8d
名前 / ファイル | ライセンス | アクション |
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C&F_159-9.pdf (5.2 MB)
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Item type | Journal Article(1) | |||||
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公開日 | 2012-11-12 | |||||
タイトル | ||||||
タイトル | Visualization study of ignition modes behind bifurcated-reflected shock waves | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
著者 |
Yamashita, Hiroki
× Yamashita, Hiroki× Kasahara, Jiro× Sugiyama, Yuta× Matsuo, Akiko |
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著者別名 |
笠原, 次郎
× 笠原, 次郎 |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | This study was a numerical and experimental investigation of low-temperature auto-ignitions behind reflected shock waves in which a shock tube was employed as the experimental system. We used a high-speed video camera and the Schlieren method to visualize the ignition phenomena. Experiments were performed over a temperature range from 549 ± 10 to 1349 ± 11 K and a pressure range from 56 ± 2 to 203 ± 13 kPa, and a non-diluted stoichiometric acetylene–oxygen mixture was chosen as the combustible gas. We introduced a numerical simulation to help us understand the disturbed temperature distribution behind bifurcated shock waves due to interference between reflected shock waves and the boundary layer developed behind incident shock waves. Additionally, we experimentally observed and evaluated quantitatively a tendency for ignition positions to be located farther from the reflecting wall as the temperature decreased behind reflected shock waves. To focus our attention on the ignition positions, we classified the ignition types behind reflected shock waves as near-wall ignition and far-wall ignition by 4.7 mm distance from reflecting wall. The criterion for these ignition types was estimated to be -1.0≦(∂ti/∂T5t)p5t≦-0.5. As a main object in this manuscript, we proposed an ignition model in which local ignition is induced at some distance from reflecting wall based on the numerical simulation and results; the local ignitions at a point distant from the reflecting wall are induced by the temperature rise, with the distance from the reflecting wall, immediately behind concave reflected shock waves due to developing of bifurcated shock waves. We confirmed that there is no discrepancy between the proposed model and experimental results. |
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書誌情報 |
Combustion and flame 巻 159, 号 9, p. 2954-2966, 発行日 2012-09 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0010-2180 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA00610787 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1016/j.combustflame.2012.05.009 | |||||
権利 | ||||||
権利情報 | © 2012 The Combustion Institute NOTICE: this is the author’s version of a work that was accepted for publication in Combustion and flame. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in PUBLICATION, Volume 159, Issue 9, 2012 DOI:10.1016/j.combustflame.2012.05.009 |
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著者版フラグ | ||||||
値 | author | |||||
出版者 | ||||||
出版者 | Elsevier Inc. | |||||
URI | ||||||
識別子 | http://hdl.handle.net/2241/117847 | |||||
識別子タイプ | HDL |