Large-Scale Disturbances and Their Mitigation Downstream of Shallow Cavities Covered by a Perforated Lid

[+] Author and Article Information
Stephen A. Jordan

Naval Undersea Warfare Center, Newport, RI 02841e-mail: jordansa@npt.nuwc.navy.mil

J. Fluids Eng 126(5), 851-860 (Dec 07, 2004) (10 pages) doi:10.1115/1.1792270 History: Received September 17, 2003; Revised May 30, 2004; Online December 07, 2004
Copyright © 2004 by ASME
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Grahic Jump Location
Comparison of time-averaged streamwise turbulence intensity 〈u〉/U for uniform and variable slot spacing. (a) Contours Max. 0.48, Min. 0.0, Incr. 0.024. (b) Contours Max. 0.28, Min. 0.0, Incr. 0.014.
Grahic Jump Location
Comparison of phase-averaged streamwise turbulence intensity 〈u〉/U (ten averages at the fundamental frequency) for uniform and variable slot spacing (a) Contours Max. 0.44, Min. 0.0, Incr. 0.022. (b) Contours Max. 0.26, Min. 0.0, Incr. 0.013.
Grahic Jump Location
Staggered-hole 11, open 1 and slotted-cover cavity results indicating the dimensionless frequency and minimum streamwise length of an oscillatory flow for a specific cavity depth. (a) Dimensionless frequency. (b) Minimum streamwise length.
Grahic Jump Location
Time series and frequency spectrum of the large-scale oscillation for a three slotted-lid cavity. (a) Time series. (b) Frequency spectrum: bReδoo=468.
Grahic Jump Location
Time series and frequency spectrum of the large-scale oscillation for a five slotted-cover cavity. (a) Time series. (b) Frequency spectrum: bReδoo=530.
Grahic Jump Location
Comparison of the disturbance phase velocities over an open 2 and slotted-lid cavity; circle and square symbols signify the first and second modes of the open cavity, respectively
Grahic Jump Location
Scaled pressure spectrum (9 slots, b/d=4.5) and ratio of the spectral peaks inside and downstream of the slotted-covered cavity (3–11 slots). (a) Pressure spectrum. (b) Peak Sp ratio.
Grahic Jump Location
Comparison of the phase velocities of the large-scale instability over an open and slotted-cover cavity; circle and square symbols signify the first and second modes, respectively. (a) Pressure spectra. (b) Momentum thickness.
Grahic Jump Location
Example slot geometry (five slots) and the initial frequency spectra of the large-scale instability (a) Slot geometry. (b) Oscillation frequency.
Grahic Jump Location
Scaled frequency of the large-scale instability as a function of the streamwise cavity width for three geometric configurations (open, staggered and slotted)
Grahic Jump Location
Cross correlation coefficient (averaged over ten instability cycles); three slots (Red=4210, 6210) and five slots (Red=8680). (a) Three slots. (b) Five slots.
Grahic Jump Location
Cross correlation coefficient between the Aft Cavity Pressure (indicated by the dot) and the resolved pressures (11 slots)



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