Influence of jet spacing in spanwise-inclined jet injection in supersonic crossflow
In separation control with air-jet vortex generators in supersonic flow, the spacing of the jets in a row array has a crucial effect on the control effectiveness. Previous experimental studies have revealed the overall influence of jet spacing on air-jet vortex generator controlled shock-induced sep...
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| Veröffentlicht in: | Journal of fluid mechanics 2022-09, Vol.946, Article A39 |
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| description | In separation control with air-jet vortex generators in supersonic flow, the spacing of the jets in a row array has a crucial effect on the control effectiveness. Previous experimental studies have revealed the overall influence of jet spacing on air-jet vortex generator controlled shock-induced separation zones, focusing mostly on the separation regions. There is, however, a gap in knowledge regarding the mechanisms leading to these changes in control effectiveness, particularly on the interaction between multiple jets and the details of downstream flow evolution. Therefore, the objective of the current study is to provide detailed information on the underlying flow dynamics associated with the injection of a row of spanwise-inclined jets into a supersonic turbulent boundary layer – and in particular the effects of different jet spacings. Four different spacings were studied with large-eddy simulations. In addition, we performed oil-flow and schlieren visualizations of separation control in a 24$^\circ$ compression–ramp interaction with different jet-spacing configurations to validate and discuss our conclusions regarding the effects of jet/jet interactions on the separation-control effectiveness. We analyse the influence of jet spacing on the flow topology, induced vortical structures, and boundary-layer statistics. The jet-induced major vortex pair is the dominant flow structure energizing the near-wall boundary layer. The paper details how interactions amongst adjacent vortex pairs differ for varying jet spacings, thus influencing the momentum transfer and eventually the control efficiency. The dynamic behaviour of the flow was analysed using a three-dimensional dynamic mode decomposition. The resulting insights are key to the development of efficient control set-ups. |
| doi_str_mv | 10.1017/jfm.2022.597 |
| format | Article |
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Previous experimental studies have revealed the overall influence of jet spacing on air-jet vortex generator controlled shock-induced separation zones, focusing mostly on the separation regions. There is, however, a gap in knowledge regarding the mechanisms leading to these changes in control effectiveness, particularly on the interaction between multiple jets and the details of downstream flow evolution. Therefore, the objective of the current study is to provide detailed information on the underlying flow dynamics associated with the injection of a row of spanwise-inclined jets into a supersonic turbulent boundary layer – and in particular the effects of different jet spacings. Four different spacings were studied with large-eddy simulations. In addition, we performed oil-flow and schlieren visualizations of separation control in a 24$^\circ$ compression–ramp interaction with different jet-spacing configurations to validate and discuss our conclusions regarding the effects of jet/jet interactions on the separation-control effectiveness. We analyse the influence of jet spacing on the flow topology, induced vortical structures, and boundary-layer statistics. The jet-induced major vortex pair is the dominant flow structure energizing the near-wall boundary layer. The paper details how interactions amongst adjacent vortex pairs differ for varying jet spacings, thus influencing the momentum transfer and eventually the control efficiency. The dynamic behaviour of the flow was analysed using a three-dimensional dynamic mode decomposition. The resulting insights are key to the development of efficient control set-ups.</description><identifier>ISSN: 0022-1120</identifier><identifier>EISSN: 1469-7645</identifier><identifier>DOI: 10.1017/jfm.2022.597</identifier><language>eng</language><publisher>Cambridge, UK: Cambridge University Press</publisher><subject>Boundary layers ; Compression ; Control ; Cross flow ; Effectiveness ; Efficiency ; Flow structures ; Fluid dynamics ; Fluid flow ; Fluid mechanics ; Influence ; Injection ; Jet interaction ; Jets ; JFM Papers ; Large eddy simulation ; Momentum ; Momentum transfer ; Oceanic eddies ; Separation ; Statistical methods ; Supersonic flow ; Three dimensional analysis ; Topology ; Turbulent boundary layer ; Vortex generators ; Vortices</subject><ispartof>Journal of fluid mechanics, 2022-09, Vol.946, Article A39</ispartof><rights>The Author(s), 2022. Published by Cambridge University Press</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c232t-db99b82f9a00b6b0d4694ad38d07f37c910f5c5f26521c69659428719dff0ab93</citedby><cites>FETCH-LOGICAL-c232t-db99b82f9a00b6b0d4694ad38d07f37c910f5c5f26521c69659428719dff0ab93</cites><orcidid>0000-0003-3737-9301 ; 0000-0001-7845-1969</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.cambridge.org/core/product/identifier/S0022112022005973/type/journal_article$$EHTML$$P50$$Gcambridge$$H</linktohtml><link.rule.ids>164,314,780,784,27922,27923,55626</link.rule.ids></links><search><creatorcontrib>Sebastian, R.</creatorcontrib><creatorcontrib>Schreyer, A.-M.</creatorcontrib><title>Influence of jet spacing in spanwise-inclined jet injection in supersonic crossflow</title><title>Journal of fluid mechanics</title><addtitle>J. Fluid Mech</addtitle><description>In separation control with air-jet vortex generators in supersonic flow, the spacing of the jets in a row array has a crucial effect on the control effectiveness. Previous experimental studies have revealed the overall influence of jet spacing on air-jet vortex generator controlled shock-induced separation zones, focusing mostly on the separation regions. There is, however, a gap in knowledge regarding the mechanisms leading to these changes in control effectiveness, particularly on the interaction between multiple jets and the details of downstream flow evolution. Therefore, the objective of the current study is to provide detailed information on the underlying flow dynamics associated with the injection of a row of spanwise-inclined jets into a supersonic turbulent boundary layer – and in particular the effects of different jet spacings. Four different spacings were studied with large-eddy simulations. In addition, we performed oil-flow and schlieren visualizations of separation control in a 24$^\circ$ compression–ramp interaction with different jet-spacing configurations to validate and discuss our conclusions regarding the effects of jet/jet interactions on the separation-control effectiveness. We analyse the influence of jet spacing on the flow topology, induced vortical structures, and boundary-layer statistics. The jet-induced major vortex pair is the dominant flow structure energizing the near-wall boundary layer. The paper details how interactions amongst adjacent vortex pairs differ for varying jet spacings, thus influencing the momentum transfer and eventually the control efficiency. The dynamic behaviour of the flow was analysed using a three-dimensional dynamic mode decomposition. The resulting insights are key to the development of efficient control set-ups.</description><subject>Boundary layers</subject><subject>Compression</subject><subject>Control</subject><subject>Cross flow</subject><subject>Effectiveness</subject><subject>Efficiency</subject><subject>Flow structures</subject><subject>Fluid dynamics</subject><subject>Fluid flow</subject><subject>Fluid mechanics</subject><subject>Influence</subject><subject>Injection</subject><subject>Jet interaction</subject><subject>Jets</subject><subject>JFM Papers</subject><subject>Large eddy simulation</subject><subject>Momentum</subject><subject>Momentum transfer</subject><subject>Oceanic eddies</subject><subject>Separation</subject><subject>Statistical methods</subject><subject>Supersonic flow</subject><subject>Three dimensional analysis</subject><subject>Topology</subject><subject>Turbulent boundary layer</subject><subject>Vortex generators</subject><subject>Vortices</subject><issn>0022-1120</issn><issn>1469-7645</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2022</creationdate><recordtype>article</recordtype><sourceid>8G5</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><sourceid>GUQSH</sourceid><sourceid>M2O</sourceid><recordid>eNptkE1LxDAQhoMouK7e_AEFr7ZO0jbZHGXRdWHBg3oOaT6WlG5ak5bFf2_2A7x4mmF45p13XoTuMRQYMHtq7a4gQEhRc3aBZriiPGe0qi_RDNI4x5jANbqJsQXAJXA2Qx9rb7vJeGWy3matGbM4SOX8NnP-0Pq9iyZ3XnXOG30EnG-NGl3vj8g0mBB771SmQh-j7fr9Lbqysovm7lzn6Ov15XP5lm_eV-vl8yZXpCRjrhvOmwWxXAI0tAGd7FZSlwsNzJZMcQy2VrUltCZYUU5rXpEFw1xbC7Lh5Rw9nHSH0H9PJo6i7afg00lBGECNafoxUY8n6ugvGCuG4HYy_AgM4hCbSLGJQ2wixZbw4ozLXROc3po_1X8XfgH272-W</recordid><startdate>20220910</startdate><enddate>20220910</enddate><creator>Sebastian, R.</creator><creator>Schreyer, A.-M.</creator><general>Cambridge University Press</general><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7TB</scope><scope>7U5</scope><scope>7UA</scope><scope>7XB</scope><scope>88I</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>8FK</scope><scope>8G5</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>BHPHI</scope><scope>BKSAR</scope><scope>C1K</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>F1W</scope><scope>FR3</scope><scope>GNUQQ</scope><scope>GUQSH</scope><scope>H8D</scope><scope>H96</scope><scope>HCIFZ</scope><scope>KR7</scope><scope>L.G</scope><scope>L6V</scope><scope>L7M</scope><scope>M2O</scope><scope>M2P</scope><scope>M7S</scope><scope>MBDVC</scope><scope>P5Z</scope><scope>P62</scope><scope>PCBAR</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PTHSS</scope><scope>Q9U</scope><scope>S0W</scope><orcidid>https://orcid.org/0000-0003-3737-9301</orcidid><orcidid>https://orcid.org/0000-0001-7845-1969</orcidid></search><sort><creationdate>20220910</creationdate><title>Influence of jet spacing in spanwise-inclined jet injection in supersonic crossflow</title><author>Sebastian, R. ; Schreyer, A.-M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c232t-db99b82f9a00b6b0d4694ad38d07f37c910f5c5f26521c69659428719dff0ab93</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2022</creationdate><topic>Boundary layers</topic><topic>Compression</topic><topic>Control</topic><topic>Cross flow</topic><topic>Effectiveness</topic><topic>Efficiency</topic><topic>Flow structures</topic><topic>Fluid dynamics</topic><topic>Fluid flow</topic><topic>Fluid mechanics</topic><topic>Influence</topic><topic>Injection</topic><topic>Jet interaction</topic><topic>Jets</topic><topic>JFM Papers</topic><topic>Large eddy simulation</topic><topic>Momentum</topic><topic>Momentum transfer</topic><topic>Oceanic eddies</topic><topic>Separation</topic><topic>Statistical methods</topic><topic>Supersonic flow</topic><topic>Three dimensional analysis</topic><topic>Topology</topic><topic>Turbulent boundary layer</topic><topic>Vortex generators</topic><topic>Vortices</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sebastian, R.</creatorcontrib><creatorcontrib>Schreyer, A.-M.</creatorcontrib><collection>CrossRef</collection><collection>ProQuest Central (Corporate)</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Water Resources Abstracts</collection><collection>ProQuest Central (purchase pre-March 2016)</collection><collection>Science Database (Alumni Edition)</collection><collection>Technology Research Database</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>ProQuest Central (Alumni) (purchase pre-March 2016)</collection><collection>Research Library (Alumni Edition)</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest One Sustainability</collection><collection>ProQuest Central UK/Ireland</collection><collection>Advanced Technologies & Aerospace Collection</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>Natural Science Collection</collection><collection>Earth, Atmospheric & Aquatic Science Collection</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>ProQuest Central Student</collection><collection>Research Library Prep</collection><collection>Aerospace Database</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>SciTech Premium Collection</collection><collection>Civil Engineering Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>ProQuest Engineering Collection</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Research Library</collection><collection>Science Database</collection><collection>Engineering Database</collection><collection>Research Library (Corporate)</collection><collection>Advanced Technologies & Aerospace Database</collection><collection>ProQuest Advanced Technologies & Aerospace Collection</collection><collection>Earth, Atmospheric & Aquatic Science Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>Engineering Collection</collection><collection>ProQuest Central Basic</collection><collection>DELNET Engineering & Technology Collection</collection><jtitle>Journal of fluid mechanics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Sebastian, R.</au><au>Schreyer, A.-M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Influence of jet spacing in spanwise-inclined jet injection in supersonic crossflow</atitle><jtitle>Journal of fluid mechanics</jtitle><addtitle>J. Fluid Mech</addtitle><date>2022-09-10</date><risdate>2022</risdate><volume>946</volume><artnum>A39</artnum><issn>0022-1120</issn><eissn>1469-7645</eissn><abstract>In separation control with air-jet vortex generators in supersonic flow, the spacing of the jets in a row array has a crucial effect on the control effectiveness. Previous experimental studies have revealed the overall influence of jet spacing on air-jet vortex generator controlled shock-induced separation zones, focusing mostly on the separation regions. There is, however, a gap in knowledge regarding the mechanisms leading to these changes in control effectiveness, particularly on the interaction between multiple jets and the details of downstream flow evolution. Therefore, the objective of the current study is to provide detailed information on the underlying flow dynamics associated with the injection of a row of spanwise-inclined jets into a supersonic turbulent boundary layer – and in particular the effects of different jet spacings. Four different spacings were studied with large-eddy simulations. In addition, we performed oil-flow and schlieren visualizations of separation control in a 24$^\circ$ compression–ramp interaction with different jet-spacing configurations to validate and discuss our conclusions regarding the effects of jet/jet interactions on the separation-control effectiveness. We analyse the influence of jet spacing on the flow topology, induced vortical structures, and boundary-layer statistics. The jet-induced major vortex pair is the dominant flow structure energizing the near-wall boundary layer. The paper details how interactions amongst adjacent vortex pairs differ for varying jet spacings, thus influencing the momentum transfer and eventually the control efficiency. The dynamic behaviour of the flow was analysed using a three-dimensional dynamic mode decomposition. The resulting insights are key to the development of efficient control set-ups.</abstract><cop>Cambridge, UK</cop><pub>Cambridge University Press</pub><doi>10.1017/jfm.2022.597</doi><tpages>43</tpages><orcidid>https://orcid.org/0000-0003-3737-9301</orcidid><orcidid>https://orcid.org/0000-0001-7845-1969</orcidid></addata></record> |
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| source | Cambridge University Press Journals Complete |
| subjects | Boundary layers Compression Control Cross flow Effectiveness Efficiency Flow structures Fluid dynamics Fluid flow Fluid mechanics Influence Injection Jet interaction Jets JFM Papers Large eddy simulation Momentum Momentum transfer Oceanic eddies Separation Statistical methods Supersonic flow Three dimensional analysis Topology Turbulent boundary layer Vortex generators Vortices |
| title | Influence of jet spacing in spanwise-inclined jet injection in supersonic crossflow |
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