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Modification of Axisymmetric Jet Expansion by Forced Localized Separation on the Lip.

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Title: Modification of Axisymmetric Jet Expansion by Forced Localized Separation on the Lip.
Authors: Mathis, R.1,2 romain.mathis@univ-lillel.fr, Collin, Erwan2 erwan.collin@ensma.fr, Delville, Joël2 joel.delville@univ-poitiers.fr, Fourment, Carine2 carine.fourment@univ-poitiers.fr
Source: AIAA Journal. Dec2014, Vol. 52 Issue 12, p2730-2738. 9p.
Subjects: Trailing edges (Aerodynamics), Jet plane testing, Subsonic flow, Actuators, Measurement of flow velocity, Turbulence
Abstract: An experimental study is performed to investigate the mixing enhancement induced by forced localized separation on the trailing edge of a subsonic round jet. Two different configurations are tested: the first one with two forced-localized-separation diametrically opposed, and the second one with eight forced-localized-separation regularly distributed. Each forced localized separation, considered here as the actuator, is driven by steady pneumatic blowing. Particle-image-velocimetry measurements are used with two optical setups in order to analyze the flow features in cross sections and meridian planes. In each case, a strong deformation of the mean velocity field is observed, with a substantial reduction of the potential core length of the jet. The turbulent field is shown to be highly modified as well, with a significant raise of all turbulent components. Analysis of the mixing layer region reveals different flow control mechanisms, depending on the distribution of forced localized separations. [ABSTRACT FROM AUTHOR]
Copyright of AIAA Journal is the property of American Institute of Aeronautics & Astronautics and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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PubType: Academic Journal
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  Data: Modification of Axisymmetric Jet Expansion by Forced Localized Separation on the Lip.
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  Data: <searchLink fieldCode="DE" term="%22Trailing+edges+%28Aerodynamics%29%22">Trailing edges (Aerodynamics)</searchLink><br /><searchLink fieldCode="DE" term="%22Jet+plane+testing%22">Jet plane testing</searchLink><br /><searchLink fieldCode="DE" term="%22Subsonic+flow%22">Subsonic flow</searchLink><br /><searchLink fieldCode="DE" term="%22Actuators%22">Actuators</searchLink><br /><searchLink fieldCode="DE" term="%22Measurement+of+flow+velocity%22">Measurement of flow velocity</searchLink><br /><searchLink fieldCode="DE" term="%22Turbulence%22">Turbulence</searchLink>
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  Data: An experimental study is performed to investigate the mixing enhancement induced by forced localized separation on the trailing edge of a subsonic round jet. Two different configurations are tested: the first one with two forced-localized-separation diametrically opposed, and the second one with eight forced-localized-separation regularly distributed. Each forced localized separation, considered here as the actuator, is driven by steady pneumatic blowing. Particle-image-velocimetry measurements are used with two optical setups in order to analyze the flow features in cross sections and meridian planes. In each case, a strong deformation of the mean velocity field is observed, with a substantial reduction of the potential core length of the jet. The turbulent field is shown to be highly modified as well, with a significant raise of all turbulent components. Analysis of the mixing layer region reveals different flow control mechanisms, depending on the distribution of forced localized separations. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of AIAA Journal is the property of American Institute of Aeronautics & Astronautics and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.2514/1.J052958
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      – Code: eng
        Text: English
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        PageCount: 9
        StartPage: 2730
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      – SubjectFull: Trailing edges (Aerodynamics)
        Type: general
      – SubjectFull: Jet plane testing
        Type: general
      – SubjectFull: Subsonic flow
        Type: general
      – SubjectFull: Actuators
        Type: general
      – SubjectFull: Measurement of flow velocity
        Type: general
      – SubjectFull: Turbulence
        Type: general
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      – TitleFull: Modification of Axisymmetric Jet Expansion by Forced Localized Separation on the Lip.
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            NameFull: Collin, Erwan
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            NameFull: Delville, Joël
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              M: 12
              Text: Dec2014
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