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TECHNICAL PAPERS

Investigation of the Flopping Regime of Two-, Three-, and Four-Plate Arrays

[+] Author and Article Information
D. W. Guillaume

Department of Mechanical Engineering, California State University, Los Angeles, Los Angeles, CA 90032

J. C. LaRue

Department of Mechanical and Aerospace Engineering, University of California, Irvine, Irvine, CA 92697

J. Fluids Eng 122(4), 677-682 (Jun 01, 2000) (6 pages) doi:10.1115/1.1311789 History: Received September 13, 1999; Revised June 01, 2000
Copyright © 2000 by ASME
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References

Figures

Grahic Jump Location
Schematic illustration of forced or spontaneous flopping downstream of the plate array. The other mode is the opposite in that the wide wake is on the bottom and the narrow wake is on the top.
Grahic Jump Location
Base pressure coefficient, Cp, as a function of time for a two-plate array with U=11.08 m/s and s/t=0.25. Figure 1(a) corresponds to the top plate and Fig. 1(b) corresponds to the bottom plate.
Grahic Jump Location
Base pressure coefficient, Cp, as a function of time for a four-plate array with U=11.08 m/s and s/t=0.192. Figure 3(a) corresponds to the top plate, Fig. 3(b) corresponds to the upper middle plate, Fig. 3(c) corresponds to the lower middle plate, and Fig. 3(d) corresponds to the bottom plate.
Grahic Jump Location
Smoke visualization showing spontaneous flopping of the wakes downstream of the four-plate array with U=11.08 m/s and s/t=0.192. Figures 4(a) and 4(b) show example flow patterns before and after flopping.
Grahic Jump Location
Smoke visualization showing spontaneous flopping of the wakes downstream of the four-plate array with U=11.08 m/s and s/t=0.192. Figures 5(a) and 5(b) show example flow patterns before and after flopping.
Grahic Jump Location
Probability density function for the time duration of high average and low average Cp values with U=11.08 m/s. Symbols: zero-event Poisson distribution, —; high average Cp values (two-plate array, s/t=0.25), •; low average Cp values (two plate array, s/t=0.25), ○; high average Cp values (three plate array, s/t=0.5), ▪; low average Cp values (three plate array, s/t=0.5), □; high average Cp values (four-plate array, c/t=0.192), ▴; and; low average Cp values (four-plate array, s/t=0.192), ▵.
Grahic Jump Location
Probability density function for the time intervals between one transition from low to high Cp and the subsequent transition from low to high Cp with U=11.08 m/s. Symbols: one event Poisson distribution, —; pdf for the two-plate array with s/t=0.25, •; pdf for the three plate array with s/t=0.5, ▪; and, pdf for the four plate array with s/t=0.192, ▴.
Grahic Jump Location
Power spectra of the hot-wire signal, E\-(hw), with U=11.08 m/s and x/t=2.5. Fig. 8(a) measured on the centerplane of the two-plate array; Fig. 8(b) measured at s/2 above the upper plate of the two-plate array; Fig. 8(c) measured in the plane between the center plate and the upper plate of the three-plate array; Fig. 8(d) measured at s/2 above the upper plate of the three-plate array; Fig. 8(e) measured on the centerplane of the four-plate array; Fig. 8(f) measured between plate1 and plate2 of the four-plate array; and, Fig. 8(g) measured at s/2 above the plate1 of the four-plate array.

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