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TECHNICAL PAPERS

Self-Excited Oscillations of Flow Past a Perforated Plate: Attenuation Via Three-Dimensional Surface Elements

[+] Author and Article Information
C. Ozalp, A. Pinarbasi

Department of Mechanical Engineering, Cukurova University, 01330 Balcali Adana, Turkey

D. Rockwell

Department of Mechanical Engineering and Mechanics, 354 Packard Laboratory, 19 Memorial Drive West, Lehigh University Bethlehem, PA 18015 USAe-mail: dor0@lehigh.edu

J. Fluids Eng 127(1), 149-162 (Mar 22, 2005) (14 pages) doi:10.1115/1.1852477 History: Received October 28, 2003; Revised July 09, 2004; Online March 22, 2005
Copyright © 2005 by ASME
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References

Figures

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View of perforated plate, impingement plate, and vortex generator
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Plan and side views and dimensions of vortex generators
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Spectra of pressure fluctuation Sp at tip of impingement edge without vortex generator for various L/θ values. Images show the patterns of instantaneous vectors of the longitudinal (streamwise) component of velocity u for L/θ=20.N represents the frame number of cinema sequence. (Images were selected from Ref. 14.)
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Spectra of pressure fluctuation Sp at tip of impingement edge for type A vortex generator for various L/θ values. Images show the patterns of instantaneous vectors of the longitudinal (streamwise) component of velocity u for effective plate length L/θ=20 and for effective plate width w/θ=19, which is the same for all subsequent images. N represents the frame number of cinema sequence.
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Spectra of pressure fluctuation Sp at tip of impingement edge for type B vortex generator for various L/θ values. Images show the patterns of instantaneous vectors of the longitudinal (streamwise) component of velocity u for L/θ=20.N represents the frame number of cinema sequence.
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Spectra of pressure fluctuation Sp at tip of impingement edge for type C vortex generator for various L/θ values. Images show the patterns of instantaneous vectors of the longitudinal (streamwise) component of velocity u for L/θ=20.N represents the frame number of cinema sequence.
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Spectra of pressure fluctuation Sp at tip of impingement edge for type D vortex generator for various L/θ values. Images show the patterns of instantaneous vectors of the longitudinal (streamwise) component of velocity u for L/θ=20.N represents the frame number of cinema sequence.
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Spectra of pressure fluctuation Sp at tip of impingement edge for type E vortex generator for various L/θ values. Images show the patterns of instantaneous vectors of the longitudinal (streamwise) component of velocity u for L/θ=20.N represents the frame number of cinema sequence.
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Comparison of spectra of pressure fluctuation Sp at tip of impingement edge with and without vortex generators for L/θ=20. The first spectrum corresponds to the case of no vortex generator, while others represent spectra with vortex generators shown in the figure.
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Spectra of velocity fluctuation Su for various longitudinal (streamwise) locations for type C vortex generator and without vortex generator. The field of view indicated by the rectangular region at the top of each spectra has dimensions of 138 mm length and 86 mm width and 138 mm length and 142 mm width, respectively. Impingement length corresponds to L/θ=20.
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Spectra of velocity fluctuation Su for various spanwise positions across the impingement plate for type C vortex generator. The field of view by the rectangular region of the top of each set of spectra has dimensions of 128 mm length and 86 mm width. Impingement length corresponds to L/θ=20.
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Patterns of average vectors of the longitudinal (streamwise) component of velocity u for various vortex generators for L/θ=20 and L=152.4 mm
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Patterns of the averaged velocity vectors at various streamwise locations for different vortex generators. L/θ=20,L=152.4 mm and width w of field of view is w/θ=19.
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Contours of averaged vorticity for various vortex generators for L/θ=20

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