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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

Meyer,  E., Mechel,  F., and Kurtze,  G., 1958, “Experiments on the Influence of Flow on Sound Attenuation in Absorbing Ducts,” J. Acoust. Soc. Am., 30, pp. 165–174.
Dean, P., 1972, “On the Measurement of the Local Acoustic Impedance of the Walls of Flow Ducts and Its Use in Predicting Sound Attenuation,” Ph.D. thesis, University of Southampton.
Adams, W. J., 1974, “The Design of Reactive Silencers for Internal Combustion Engines,” Institute of Sound and Vibration Research, Interim Report, University of Southampton.
Tsui,  C. Y., and Flandro,  G. A., 1977, “Self-Induced Sound Generation by Flow Over Perforated Duct Liners,” J. Sound Vib., 50, pp. 315–331.
Bauer,  A. B., and Chapkis,  R. L., 1977, “Noise Generated by Boundary Layer Interaction With Perforated Acoustic Liners,” J. Aircr., 14, pp. 157–160.
Ronneberger,  D., 1980, “The Dynamics of Shearing Flow Over a Cavity—a Visual Study Related to the Acoustic Impedance of Small Orifices,” J. Sound Vib., 71, pp. 565–581.
Nelson,  P. A., 1982, “Noise Generated by Flow Over Perforated Surfaces,” J. Sound Vib., 83, pp. 11–26.
Howe,  M. S., 1997, “Sound Produced by Turbulent Flow Over a Perforated Inlet,” J. Sound Vib., 139, pp. 227–240.
Dickey,  N. S., Selamet,  A., and Ciray,  M. S., 2001, “An Experimental Study of the Impedance of Perforated Plates With Grazing Flow,” J. Acoust. Soc. Am., 110, pp. 2360–2370.
Bruggeman, J. C., Velekoop, J. C., Van Der Knapp, F. G. P., and Keuning, P. J., 1991, “Flow-Excited Resonance in a Cavity Covered by a Grid: Theory and Experiments,” NCA-Vol.11/FED-Vol.130, Flow Modeling, Measurement and Control ASME, pp. 135–144.
Looijmans, K. N. H., and Bruggeman, J. C., 1997, “Simple Vortex Models for Vibration and Noise Caused by a Flow Over Louvers in a Cavity Opening,” Proceedings Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise Symposium, 1 ASME AD-Vol. 53-1, pp. 351–359.
Zoccola, P. J., 2002, “Excitation by Flow Over an Obstructed Opening,” ASME IMECE2002/NCA-33374.
Celik,  E., and Rockwell,  D., 2002, “Shear Layer Oscillation Along a Perforated Surface: A Self-Excited Large-Scale Instability,” Phys. Fluids, 14(12), pp. 4444–4448.
Ozalp,  C., Pinarbasi,  A., and Rockwell,  D., 2003, “Self-Excited Oscillations of Turbulent Inflow Along a Perforated Plate,” J. Fluids Struct., 17(7), pp. 955–970.
Rockwell,  D., and Naudascher,  E., 1978, “Review—Self-Sustaining Oscillations of Flow Past Cavities,” ASME J. Basic Eng., 100, pp. 152–165.
Gharib,  M., and Roshko,  A., 1987, “The Effect of Flow Oscillations on Cavity Drag,” J. Fluid Mech., 117, pp. 501–530.
Howe,  M. S., 1997, “Edge, Cavity and Aperture Tones at Very Low Mach Numbers,” J. Fluid Mech., 330, pp. 61–84.
Howe, M. S., 1998, Acoustics of Fluid-Structure Interactions, Cambridge University Press, New York.
Ekmekci,  A., and Rockwell,  D., 2003, “Self-Sustained Oscillations of the Shear Flow Past a Slatted Plate Coupled With Cavity Resonance,” J. Fluids Struct., 17(8), pp. 1237–1245.
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Figures

Grahic Jump Location
Contours of averaged vorticity for various vortex generators for L/θ=20
Grahic Jump Location
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.
Grahic Jump Location
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
Grahic Jump Location
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.
Grahic Jump Location
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.
Grahic Jump Location
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.
Grahic Jump Location
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.
Grahic Jump Location
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.
Grahic Jump Location
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.
Grahic Jump Location
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.
Grahic Jump Location
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.
Grahic Jump Location
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.)
Grahic Jump Location
Plan and side views and dimensions of vortex generators
Grahic Jump Location
View of perforated plate, impingement plate, and vortex generator

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