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Asynchronous control of vortex-induced acoustic cavity resonance using imbedded piezo-electric actuators
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10.1121/1.3143784
/content/asa/journal/jasa/126/1/10.1121/1.3143784
http://aip.metastore.ingenta.com/content/asa/journal/jasa/126/1/10.1121/1.3143784
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Experimental setup: (a) Wind-tunnel and sensing configuration; (b) test model in detail; (c) asynchronous control system and measurement system.

Image of FIG. 2.
FIG. 2.

Dependence of the frequency of the shear layer separated from the two cavities (a) and SPL at (b) on the free-stream flow velocity in the absence of the test model.

Image of FIG. 3.
FIG. 3.

Dependence of the frequency of the vortices shed from the test model , SPL at and the magnitude of the power spectrum of the fluctuating flow velocity at on the free-stream flow velocity in the presence of the test model. The hot wire was located at and .

Image of FIG. 4.
FIG. 4.

Effect of control parameters on the SPL at and the rms value of the perturbation displacement : (a) different perturbation frequency at ; (b) different at . .

Image of FIG. 5.
FIG. 5.

Power spectrum of perturbation when the perturbation frequency was and rms value of perturbation voltage is .

Image of FIG. 6.
FIG. 6.

Spectrum of SPL with and without perturbation. The perturbation frequency and the rms value of perturbation voltage were and , respectively. .

Image of FIG. 7.
FIG. 7.

Power spectrum, , of the fluctuating flow velocity with and without perturbation . The hotwire was located at and .

Image of FIG. 8.
FIG. 8.

Cross-flow distribution of mean streamwise flow velocity and Reynolds stresses at : (a) , (b) , (c) , (d) . .

Image of FIG. 9.
FIG. 9.

Cross-flow distribution of mean streamwise flow velocity and Reynolds stresses at : (a) , (b) , (c) , (d) . .

Image of FIG. 10.
FIG. 10.

The fluctuating velocity spectrum with and without perturbation at different streamwise locations : (a) ; (b) ; (c) ; (d) ; (e) ; (f) ; (g) ; (h) ; (i) ; (j) . .

Image of FIG. 11.
FIG. 11.

Comparison in the energy reduction percentage of the fluctuating flow velocity at different streamwise locations . .

Image of FIG. 12.
FIG. 12.

The streamwise variation of the mean flow velocity under control . .

Image of FIG. 13.
FIG. 13.

Typical transition of the total streamwise flow velocity signal when the perturbation was switched off and on. The hotwire was located at and . .

Image of FIG. 14.
FIG. 14.

Spectral phase between the fluctuating flow velocity at and and the fluctuating flow velocity at and . .

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/content/asa/journal/jasa/126/1/10.1121/1.3143784
2009-07-01
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Asynchronous control of vortex-induced acoustic cavity resonance using imbedded piezo-electric actuators
http://aip.metastore.ingenta.com/content/asa/journal/jasa/126/1/10.1121/1.3143784
10.1121/1.3143784
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