Visualization study of ignition modes behind bifurcated-reflected shock waves
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 per...
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Veröffentlicht in: | Combustion and flame 2012-09, Vol.159 (9), p.2954-2966 |
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creator | Yamashita, Hiroki Kasahara, Jiro Sugiyama, Yuta Matsuo, Akiko |
description | 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±11K and a pressure range from 56±2 to 203±13kPa, 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 4.7mm 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. |
doi_str_mv | 10.1016/j.combustflame.2012.05.009 |
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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±11K and a pressure range from 56±2 to 203±13kPa, 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 4.7mm 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.</description><identifier>ISSN: 0010-2180</identifier><identifier>EISSN: 1556-2921</identifier><identifier>DOI: 10.1016/j.combustflame.2012.05.009</identifier><identifier>CODEN: CBFMAO</identifier><language>eng</language><publisher>Amsterdam: Elsevier Inc</publisher><subject>Applied sciences ; Bifurcated shock wave ; Bifurcations ; Boundary layer ; Combustion ; Combustion. Flame ; Computer simulation ; Energy ; Energy. Thermal use of fuels ; Exact sciences and technology ; High speed ; Ignition ; Induction time ; Mathematical models ; Optical visualization ; Reflected shock wave ; Shock waves ; Theoretical studies. Data and constants. Metering ; Walls</subject><ispartof>Combustion and flame, 2012-09, Vol.159 (9), p.2954-2966</ispartof><rights>2012 The Combustion Institute.</rights><rights>2015 INIST-CNRS</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c549t-28a8a3b0fc89f98d598bc21df400f873da7deaa95e1c107c7c8e8c79d701fd573</citedby><cites>FETCH-LOGICAL-c549t-28a8a3b0fc89f98d598bc21df400f873da7deaa95e1c107c7c8e8c79d701fd573</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.combustflame.2012.05.009$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=26341094$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Yamashita, Hiroki</creatorcontrib><creatorcontrib>Kasahara, Jiro</creatorcontrib><creatorcontrib>Sugiyama, Yuta</creatorcontrib><creatorcontrib>Matsuo, Akiko</creatorcontrib><title>Visualization study of ignition modes behind bifurcated-reflected shock waves</title><title>Combustion and flame</title><description>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±11K and a pressure range from 56±2 to 203±13kPa, 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 4.7mm 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.</description><subject>Applied sciences</subject><subject>Bifurcated shock wave</subject><subject>Bifurcations</subject><subject>Boundary layer</subject><subject>Combustion</subject><subject>Combustion. Flame</subject><subject>Computer simulation</subject><subject>Energy</subject><subject>Energy. Thermal use of fuels</subject><subject>Exact sciences and technology</subject><subject>High speed</subject><subject>Ignition</subject><subject>Induction time</subject><subject>Mathematical models</subject><subject>Optical visualization</subject><subject>Reflected shock wave</subject><subject>Shock waves</subject><subject>Theoretical studies. Data and constants. 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Flame</topic><topic>Computer simulation</topic><topic>Energy</topic><topic>Energy. Thermal use of fuels</topic><topic>Exact sciences and technology</topic><topic>High speed</topic><topic>Ignition</topic><topic>Induction time</topic><topic>Mathematical models</topic><topic>Optical visualization</topic><topic>Reflected shock wave</topic><topic>Shock waves</topic><topic>Theoretical studies. Data and constants. Metering</topic><topic>Walls</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Yamashita, Hiroki</creatorcontrib><creatorcontrib>Kasahara, Jiro</creatorcontrib><creatorcontrib>Sugiyama, Yuta</creatorcontrib><creatorcontrib>Matsuo, Akiko</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Combustion and flame</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Yamashita, Hiroki</au><au>Kasahara, Jiro</au><au>Sugiyama, Yuta</au><au>Matsuo, Akiko</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Visualization study of ignition modes behind bifurcated-reflected shock waves</atitle><jtitle>Combustion and flame</jtitle><date>2012-09-01</date><risdate>2012</risdate><volume>159</volume><issue>9</issue><spage>2954</spage><epage>2966</epage><pages>2954-2966</pages><issn>0010-2180</issn><eissn>1556-2921</eissn><coden>CBFMAO</coden><abstract>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±11K and a pressure range from 56±2 to 203±13kPa, 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 4.7mm 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.</abstract><cop>Amsterdam</cop><pub>Elsevier Inc</pub><doi>10.1016/j.combustflame.2012.05.009</doi><tpages>13</tpages><oa>free_for_read</oa></addata></record> |
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subjects | Applied sciences Bifurcated shock wave Bifurcations Boundary layer Combustion Combustion. Flame Computer simulation Energy Energy. Thermal use of fuels Exact sciences and technology High speed Ignition Induction time Mathematical models Optical visualization Reflected shock wave Shock waves Theoretical studies. Data and constants. Metering Walls |
title | Visualization study of ignition modes behind bifurcated-reflected shock waves |
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