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ADDITIONAL TECHNICAL PAPERS

Effect of Gap Size on Tip Leakage Cavitation Inception, Associated Noise and Flow Structure

[+] Author and Article Information
Shridhar Gopalan, Joseph Katz, Han L. Liu

Department of Mechanical Engineering, The Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218

J. Fluids Eng 124(4), 994-1004 (Dec 04, 2002) (11 pages) doi:10.1115/1.1514496 History: Received March 21, 2002; Revised May 03, 2002; Online December 04, 2002
Copyright © 2002 by ASME
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References

Figures

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(a) Experimental facility, (b) close-up of test section, (c) two three-dimensional views of the hydrofoil, showing the geometry
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Estimated spanwise lift distribution on the hydrofoil at 0 deg incidence
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Size distribution of cavitation nuclei measured upstream of the leading edge of the hydrofoil
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(a) Setup for cavitation inception measurements. (b) Setup for PIV measurements in the plane XY. Intersection of tip and TE corresponds to Y=0.
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A sample accelerometer signal showing several spikes caused as a result of cavitation
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Cavitation event rates as a function of the cavitation index σ, for three gap sizes
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Six consecutive frames, 1 ms apart, are superimposed to show the trajectory of the bubbly tip leakage vortex. The gap size in this example is 0.6 mm.
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(a) A high-speed series (frames 1299–1304) at 2000 fps (gap size, 2.6 mm). Flow is from left to right with suction surface, tip and trailing edge (TE) visible (σ=10). (b) Corresponding accelerometer and strobe signals (indicated by vertical bars). (c) Hilbert-Huang spectrum of the accelerometer signal. Frame timings are indicated by dashed lines. Table 1 is included in Fig. 8.  
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(a) A high-speed series (frames 2103–2107) at 2000 fps (gap size, 2.6 mm). Flow is from left to right with suction surface, tip and trailing edge visible (σ=10). (b) Corresponding accelerometer and strobe signals (indicated by vertical bars at the bottom). (c) Hilbert-Huang spectrum of the accelerometer signal. Frame timings are indicated by dashed lines. Table 2 is included in Fig. 9.  
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(a) A high-speed series (frames 1493–1498) at 2000 fps (gap size, 0.6 mm). Flow is from left to right with suction surface and tip visible (σ=10). (b) Corresponding accelerometer and strobe signals (indicated by vertical bars). (c) Hilbert-Huang spectrum of the accelerometer signal. Frame timings are indicated by dashed lines. Table 3 is included in Fig. 10.  
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A 0.25 s long exposure showing the trajectory of the bubbly tip leakage vortex as seen in a side view (Fig. 1(b)), for gaps of (a) 0.6 mm; (b) 1.4 mm; (c) 2.6 mm. Flow is from left to right. The hydrofoil with its trailing edge and tip is visible on the left edge of the images.
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Sample instantaneous vorticity (a, c, and e) and their “zoomed in” counterparts (b, d, and f) with instantaneous velocity in the plane xy for gap sizes of 0.6, 1.4, and 2.6 mm, respectively. The dashed boxes in the two views represent the same area.
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Probability density histograms of circulation in the tip leakage vortex for the three gap sizes and corresponding minimum pressure coefficients.
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Locations of the tip leakage vortex cores in the plane xy for gap sizes of (a) 0.6 mm (b) 1.4 mm and (c) 2.6 mm.

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