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TECHNICAL PAPERS

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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References

Figures

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Cross correlation coefficient (averaged over ten instability cycles); three slots (Red=4210, 6210) and five slots (Red=8680). (a) Three slots. (b) Five slots.
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Cross correlation coefficient between the Aft Cavity Pressure (indicated by the dot) and the resolved pressures (11 slots)
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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.
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Time series and frequency spectrum of the large-scale oscillation for a three slotted-lid cavity. (a) Time series. (b) Frequency spectrum: bReδoo=468.
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Time series and frequency spectrum of the large-scale oscillation for a five slotted-cover cavity. (a) Time series. (b) Frequency spectrum: bReδoo=530.
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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
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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.
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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.
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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.
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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.
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Example slot geometry (five slots) and the initial frequency spectra of the large-scale instability (a) Slot geometry. (b) Oscillation frequency.
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Scaled frequency of the large-scale instability as a function of the streamwise cavity width for three geometric configurations (open, staggered and slotted)

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