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Role of coherent structures in supersonic impinging jetsa)
a)Contributed Paper: AIAA 2010-3873. Presented at the 16th AIAA/CEAS Aeroacoustics Conference, Stockholm, Sweden, 7–9 June 2010.
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10.1063/1.4811401
/content/aip/journal/pof2/25/7/10.1063/1.4811401
http://aip.metastore.ingenta.com/content/aip/journal/pof2/25/7/10.1063/1.4811401
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

A schematic of feedback loop for impinging jet.

Image of FIG. 2.
FIG. 2.

Effectiveness of microjet control, NPR = 3.7.

Image of FIG. 3.
FIG. 3.

A schematic of the STOVL facility.

Image of FIG. 4.
FIG. 4.

A schematic of the PIV setup.

Image of FIG. 5.
FIG. 5.

Schematic of the phase-locking system.

Image of FIG. 6.
FIG. 6.

Near-field noise spectra obtained using microphone located at 15d from centerline in the nozzle exit plane. (a) h/d = 4 and (b) h/d = 4.5.

Image of FIG. 7.
FIG. 7.

Narrowband pressure spectra measured at the lift plate. (a) h/d = 4 and (b) h/d = 4.5.

Image of FIG. 8.
FIG. 8.

Ensemble-averaged velocity distribution in the central plane of the baseline (no control) impinging jet. (a) h/d = 4 and (b) h/d = 4.5.

Image of FIG. 9.
FIG. 9.

Ensemble-averaged vorticity distribution in the central plane of the baseline (no control) impinging jet. (a) h/d = 4 and (b) h/d = 4.5.

Image of FIG. 10.
FIG. 10.

Phase-averaged impinging jet flow field at h/d = 4.5; left-hand side: azimuthal vorticity; right-hand side: streamwise velocity in the center plane. (a) ϕ = 0°, (b) ϕ = 60°, (c) ϕ = 120°, (d) ϕ = 180°, (e) ϕ = 240°, and (f) ϕ = 300°.

Image of FIG. 11.
FIG. 11.

Phase-averaged impinging jet flow field at h/d = 4 and ϕ = 0°.

Image of FIG. 12.
FIG. 12.

Swirl strength distribution in the central plane of the impinging jet, ϕ = 0°. (a) h/d = 4 and (b) h/d = 4.5.

Image of FIG. 13.
FIG. 13.

Effect of control on swirl strength distribution, ϕ = 0°. (a) h/d = 4 and (b) h/d = 4.5.

Image of FIG. 14.
FIG. 14.

Growth of coherent structures along the streamwise location (no control).

Image of FIG. 15.
FIG. 15.

Effect of h/d on the mode of oscillation. (a) h/d = 4, ϕ = 0°; (b) h/d = 4, ϕ = 30°; (c) h/d = 4, ϕ = 90°; (d) h/d = 4.5, ϕ = 0°; (e) h/d = 4.5, ϕ = 30°; and (f) h/d = 4.5, ϕ = 90°.

Image of FIG. 16.
FIG. 16.

Mode of oscillation at different instants of time. (a) h/d = 4 at two different instants of time and (b) h/d = 4.5 at two different instants of time.

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2013-07-01
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Role of coherent structures in supersonic impinging jetsa)
http://aip.metastore.ingenta.com/content/aip/journal/pof2/25/7/10.1063/1.4811401
10.1063/1.4811401
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