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Vortex sound under the influence of a piecewise porous material on an infinite rigid plane
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10.1121/1.2783201
/content/asa/journal/jasa/122/5/10.1121/1.2783201
http://aip.metastore.ingenta.com/content/asa/journal/jasa/122/5/10.1121/1.2783201
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematics for the vortex-porous material system.

Image of FIG. 2.
FIG. 2.

Effect of pressure-releasing surface on the vortex motion, velocity, acceleration, and the sound generation at a fixed : (a) vortex path; (b) longitudinal velocity; (c) transverse velocity; (d) longitudinal acceleration; (e) transverse acceleration; and (f) dipole sound pressure; (—) , ; (---) , ; (-∙-) , ; (-∙∙-) , .

Image of FIG. 3.
FIG. 3.

Effect of porous material thickness on the vortex motion and the sound generation: (a) vortex path; and (b) dipole sound pressure; (—) ; (---) ; (......) ; (–∙–) ; (-∙-) ; and .

Image of FIG. 4.
FIG. 4.

Combined effects of and on vortex sound radiation in a perfectly inviscid fluid: (a) longitudinal dipole magnitude; and (b) acoustical energy per unit spanwise length; (—) ; (--) ; (–∙–) ; (– ∙ –) ; (엯) ; (◻) .

Image of FIG. 5.
FIG. 5.

Combined effects of effective fluid density and flow resistance on the vortex motion, velocity, acceleration, and the sound generation at a fixed , and : (a) vortex path; (b) longitudinal velocity; (c) transverse velocity; (d) longitudinal acceleration; (e) transverse acceleration; and (f) dipole sound pressure; (—) ; (---) ; (∙∙∙∙) ; (-∙-) ; (– ∙ ∙ –) .

Image of FIG. 6.
FIG. 6.

Effects of and on the vortex path and the sound generation for nonvanishing : (a) vortex motion; and (b) sound pressure; and ; (---) , ; (–––) , ; (⋯⋯⋯⋯) , ; (–∙–) , ; (–∙∙–) , .

Image of FIG. 7.
FIG. 7.

Vortex motion and time variation of vortex velocity, acceleration, and sound generation of the inviscid vortex at a fixed and ; and ; (a) vortex path; (b) longitudinal velocity; (c) transverse velocity; (d) longitudinal acceleration; (e) transverse acceleration; and (f) dipole sound pressure; (—) , ; (⋯⋯⋯⋯) , ; (----) , ; (–∙∙–) , ; (–––) , ; (–∙–) , .

Image of FIG. 8.
FIG. 8.

Variations of longitudinal dipole magnitude with different , , , and : (a) ; (b) ; (●) ; (▾) ; (∎) ; (◆) ; (▴) ; (c) ; (●) ; (▾) ; (∎) ; (◆) ; (▴) ; closed symbols for , open symbols for .

Image of FIG. 9.
FIG. 9.

Acoustical energy radiated with different , , , and : (a) ; (b) ; and (c) ; Legends: same as those in Fig. 8.

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/content/asa/journal/jasa/122/5/10.1121/1.2783201
2007-11-01
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Vortex sound under the influence of a piecewise porous material on an infinite rigid plane
http://aip.metastore.ingenta.com/content/asa/journal/jasa/122/5/10.1121/1.2783201
10.1121/1.2783201
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