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. |
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| 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] |
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| Database: | Engineering Source |
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