The regimes of twin-fluid jet-in-crossflow at atmospheric and jet-engine operating conditions
The “Twin-Fluid Jet-in-Crossflow (TF-JICF)” is a nascent variation of the classical JICF, in which a liquid jet is co-injected with an annular sleeve of gas into a gaseous crossflow. Jet-engine designers are interested in using TF-JICF for liquid-fuel injection and atomization in the next-generation...
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Veröffentlicht in: | Physics of fluids (1994) 2018-02, Vol.30 (2) |
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description | The “Twin-Fluid Jet-in-Crossflow (TF-JICF)” is a nascent variation of the classical JICF, in which a liquid jet is co-injected with an annular sleeve of gas into a gaseous crossflow. Jet-engine designers are interested in using TF-JICF for liquid-fuel injection and atomization in the next-generation combustors because it is expected to minimize combustor-damaging auto-ignition and fuel-coking tendencies. However, experimental data of TF-JICF are sparse. Furthermore, a widely accepted TF-JICF model that correlates the spray’s penetration to the combined liquid-gas momentum-flux ratio (Jeff) is increasingly showing discrepancy with emerging results, suggesting a gap in the current understanding of TF-JICF. This paper describes an investigation that addressed the gap by experimentally characterizing the TF-JICF produced by a single injector across wide ranges of operating conditions (i.e., jet-A injectant, crossflow of air, crossflow Weber number = 175-1050, crossflow pressure Pcf = 1.8-9.5 atm, momentum-flux ratio J = 5-40, and air-nozzle dP = 0%-150% of Pcf). These covered the conditions previously used to develop the Jeff model, recently reported conditions that produced Jeff discrepancies, and high-pressure conditions found in jet-engines. Dye-based shadowgraph was used to acquire high-resolution (13.52 μm/pixel) images of the TF-JICF, which revealed wide-ranging characteristics such as the disrupted Rayleigh-Taylor jet instabilities, air-induced jet corrugations, spray-bifurcations, and prompt-atomization. Analyses of the data showed that contrary to the literature, the TF-JICF’s penetration is not monotonically related to Jeff. A new conceptual framework for TF-JICF is proposed, where the flow configuration is composed of four regimes, each having different penetration trends, spray structures, and underlying mechanisms. |
doi_str_mv | 10.1063/1.5010362 |
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Jet-engine designers are interested in using TF-JICF for liquid-fuel injection and atomization in the next-generation combustors because it is expected to minimize combustor-damaging auto-ignition and fuel-coking tendencies. However, experimental data of TF-JICF are sparse. Furthermore, a widely accepted TF-JICF model that correlates the spray’s penetration to the combined liquid-gas momentum-flux ratio (Jeff) is increasingly showing discrepancy with emerging results, suggesting a gap in the current understanding of TF-JICF. This paper describes an investigation that addressed the gap by experimentally characterizing the TF-JICF produced by a single injector across wide ranges of operating conditions (i.e., jet-A injectant, crossflow of air, crossflow Weber number = 175-1050, crossflow pressure Pcf = 1.8-9.5 atm, momentum-flux ratio J = 5-40, and air-nozzle dP = 0%-150% of Pcf). These covered the conditions previously used to develop the Jeff model, recently reported conditions that produced Jeff discrepancies, and high-pressure conditions found in jet-engines. Dye-based shadowgraph was used to acquire high-resolution (13.52 μm/pixel) images of the TF-JICF, which revealed wide-ranging characteristics such as the disrupted Rayleigh-Taylor jet instabilities, air-induced jet corrugations, spray-bifurcations, and prompt-atomization. Analyses of the data showed that contrary to the literature, the TF-JICF’s penetration is not monotonically related to Jeff. 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Jet-engine designers are interested in using TF-JICF for liquid-fuel injection and atomization in the next-generation combustors because it is expected to minimize combustor-damaging auto-ignition and fuel-coking tendencies. However, experimental data of TF-JICF are sparse. Furthermore, a widely accepted TF-JICF model that correlates the spray’s penetration to the combined liquid-gas momentum-flux ratio (Jeff) is increasingly showing discrepancy with emerging results, suggesting a gap in the current understanding of TF-JICF. This paper describes an investigation that addressed the gap by experimentally characterizing the TF-JICF produced by a single injector across wide ranges of operating conditions (i.e., jet-A injectant, crossflow of air, crossflow Weber number = 175-1050, crossflow pressure Pcf = 1.8-9.5 atm, momentum-flux ratio J = 5-40, and air-nozzle dP = 0%-150% of Pcf). These covered the conditions previously used to develop the Jeff model, recently reported conditions that produced Jeff discrepancies, and high-pressure conditions found in jet-engines. Dye-based shadowgraph was used to acquire high-resolution (13.52 μm/pixel) images of the TF-JICF, which revealed wide-ranging characteristics such as the disrupted Rayleigh-Taylor jet instabilities, air-induced jet corrugations, spray-bifurcations, and prompt-atomization. Analyses of the data showed that contrary to the literature, the TF-JICF’s penetration is not monotonically related to Jeff. A new conceptual framework for TF-JICF is proposed, where the flow configuration is composed of four regimes, each having different penetration trends, spray structures, and underlying mechanisms.</description><subject>Atomizing</subject><subject>Bifurcations</subject><subject>Coinjection</subject><subject>Coking</subject><subject>Combustion chambers</subject><subject>Cross flow</subject><subject>Fluid dynamics</subject><subject>Fluid jets</subject><subject>Fuel injection</subject><subject>Image acquisition</subject><subject>Momentum</subject><subject>Nozzles</subject><subject>Penetration</subject><subject>Physics</subject><subject>Spontaneous combustion</subject><subject>Weber number</subject><issn>1070-6631</issn><issn>1089-7666</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNp9kE9LAzEQxYMoWKsHv0HAk8LWSdLNbo5S_AcFL_UoSzY7aVPaZE1Sit_ere1ZGJgZ5sc83iPklsGEgRSPbFICAyH5GRkxqFVRSSnPD3MFhZSCXZKrlNYAIBSXI_K1WCGNuHRbTDRYmvfOF3azcx1dYy6GxcSQkt2EPdV5qG1I_QqjM1T7I4N-6TzS0GPU2fklNcF3Lrvg0zW5sHqT8ObUx-Tz5XkxeyvmH6_vs6d5YbjiuWiRq6pTwA10pQVUpmrNVOtSIQoJpbZTwdrKWlOb4Wx5jaxGi3WpOs15K8bk7vi3j-F7hyk367CLfpBsOGNlzZgQMFD3R-rPUkTb9NFtdfxpGDSH9BrWnNIb2Icjm4zL-mDmH_gX2pBwWw</recordid><startdate>201802</startdate><enddate>201802</enddate><creator>Tan, Zu Puayen</creator><creator>Bibik, Oleksandr</creator><creator>Shcherbik, Dmitriy</creator><creator>Zinn, Ben T.</creator><creator>Patel, Nayan</creator><general>American Institute of Physics</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><orcidid>https://orcid.org/0000-0003-3668-5198</orcidid></search><sort><creationdate>201802</creationdate><title>The regimes of twin-fluid jet-in-crossflow at atmospheric and jet-engine operating conditions</title><author>Tan, Zu Puayen ; Bibik, Oleksandr ; Shcherbik, Dmitriy ; Zinn, Ben T. ; Patel, Nayan</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c292t-be297d902c0d5f0e9c7bc4aa59ee3605af431b7ffc8cf0ef28e18efe859da22b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Atomizing</topic><topic>Bifurcations</topic><topic>Coinjection</topic><topic>Coking</topic><topic>Combustion chambers</topic><topic>Cross flow</topic><topic>Fluid dynamics</topic><topic>Fluid jets</topic><topic>Fuel injection</topic><topic>Image acquisition</topic><topic>Momentum</topic><topic>Nozzles</topic><topic>Penetration</topic><topic>Physics</topic><topic>Spontaneous combustion</topic><topic>Weber number</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Tan, Zu Puayen</creatorcontrib><creatorcontrib>Bibik, Oleksandr</creatorcontrib><creatorcontrib>Shcherbik, Dmitriy</creatorcontrib><creatorcontrib>Zinn, Ben T.</creatorcontrib><creatorcontrib>Patel, Nayan</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Physics of fluids (1994)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Tan, Zu Puayen</au><au>Bibik, Oleksandr</au><au>Shcherbik, Dmitriy</au><au>Zinn, Ben T.</au><au>Patel, Nayan</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The regimes of twin-fluid jet-in-crossflow at atmospheric and jet-engine operating conditions</atitle><jtitle>Physics of fluids (1994)</jtitle><date>2018-02</date><risdate>2018</risdate><volume>30</volume><issue>2</issue><issn>1070-6631</issn><eissn>1089-7666</eissn><coden>PHFLE6</coden><abstract>The “Twin-Fluid Jet-in-Crossflow (TF-JICF)” is a nascent variation of the classical JICF, in which a liquid jet is co-injected with an annular sleeve of gas into a gaseous crossflow. Jet-engine designers are interested in using TF-JICF for liquid-fuel injection and atomization in the next-generation combustors because it is expected to minimize combustor-damaging auto-ignition and fuel-coking tendencies. However, experimental data of TF-JICF are sparse. Furthermore, a widely accepted TF-JICF model that correlates the spray’s penetration to the combined liquid-gas momentum-flux ratio (Jeff) is increasingly showing discrepancy with emerging results, suggesting a gap in the current understanding of TF-JICF. This paper describes an investigation that addressed the gap by experimentally characterizing the TF-JICF produced by a single injector across wide ranges of operating conditions (i.e., jet-A injectant, crossflow of air, crossflow Weber number = 175-1050, crossflow pressure Pcf = 1.8-9.5 atm, momentum-flux ratio J = 5-40, and air-nozzle dP = 0%-150% of Pcf). These covered the conditions previously used to develop the Jeff model, recently reported conditions that produced Jeff discrepancies, and high-pressure conditions found in jet-engines. Dye-based shadowgraph was used to acquire high-resolution (13.52 μm/pixel) images of the TF-JICF, which revealed wide-ranging characteristics such as the disrupted Rayleigh-Taylor jet instabilities, air-induced jet corrugations, spray-bifurcations, and prompt-atomization. Analyses of the data showed that contrary to the literature, the TF-JICF’s penetration is not monotonically related to Jeff. A new conceptual framework for TF-JICF is proposed, where the flow configuration is composed of four regimes, each having different penetration trends, spray structures, and underlying mechanisms.</abstract><cop>Melville</cop><pub>American Institute of Physics</pub><doi>10.1063/1.5010362</doi><tpages>17</tpages><orcidid>https://orcid.org/0000-0003-3668-5198</orcidid></addata></record> |
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subjects | Atomizing Bifurcations Coinjection Coking Combustion chambers Cross flow Fluid dynamics Fluid jets Fuel injection Image acquisition Momentum Nozzles Penetration Physics Spontaneous combustion Weber number |
title | The regimes of twin-fluid jet-in-crossflow at atmospheric and jet-engine operating conditions |
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