Experimental Methods for Hydrodynamic Characterization of a Very Large Water Tunnel

[+] Author and Article Information
Joel T. Park

 Naval Surface Warfare Center Carderock Division West Bethesda, MD 20817-5700joel.park@navy.mil

J. Michael Cutbirth

 U. S. Navy William B. Morgan Large Cavitation Channel Memphis, TN 38113-0428

Wesley H. Brewer

 Fluid Physics International, Starkville, MS 39759

J. Fluids Eng 127(6), 1210-1214 (Jul 22, 2005) (5 pages) doi:10.1115/1.2060740 History: Received September 16, 2003; Revised July 22, 2005

The methodology for hydrodynamic characterization of a very large water tunnel is described. Results are presented for the U. S. Navy William B. Morgan Large Cavitation Channel in Memphis, Tennessee, the world’s largest water tunnel. Three key characteristics of tunnel velocity were measured: temporal stability̱, spatial uniformity̱, and turbulence̱. The velocity stability at a single point for run times greater than 2 h was measured as ±0.15% at the 95% confidence level for velocities from 0.5 to 18ms(1.659fts). The spatial nonuniformity for the axial velocity component was ±0.34 to ±0.60% for velocities from 3 to 16ms(9.852fts). The relative turbulence intensity was measured as 0.2–0.5% depending on tunnel velocity.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Schematic drawing of the LCC

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Figure 2

Long-term temporal stability of LCC test section velocity. Symbols:—0.15% reference line, light gray circles, Aerometrics July 98, gray squares, Dantec BSA Nov. 99, dark gray circles, Dantec BSA Oct. 00 & Jan. 01, ▴ Dantec BSA May 01.

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Figure 3

Tunnel velocity from main pump speed. Residuals of power-law fit. Low range intercept: −0.1314m∕s, slope: 0.3231m∕s∕rpm, r: 0.999 973, high range intercept: 0.0679m∕s, slope: 0.2449, exponent: 1.0359, r=0.9999983. Symbols: --- ±95% prediction limit, light gray circles, LDA data, linear fit, gray squares, LDA data, power-law fit.

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Figure 4

Summary of spatial variation of tunnel velocity. Symbols: gray upside down triangle, Bay 2, window 1, Dec. 98, dark gray circles, Bay 2, window 1, Jan. 01, light gray circles, Bay 2, window 1, May 01, light gray triangle, Bay 2, seeder on, Jan. 01, dark gray squares, Bay 4, window 1, Jan. 01, light gray squares, Bay 4, window 1, May 01. (a) Axial velocity, (b) vertical velocity.

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Figure 5

Contour plots for test section in bay 4 window 1 at 16.2m∕s(53ft∕s) in May 2001. (a) Vertical velocity component, (b) axial velocity component.

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Figure 6

Test section turbulence from hot film in comparison to LDA noise. Symbols: dark gray circles, TSI CTA data, gray diamond, Dantec CTA data, light gray squares, LDA noise, gray squares, LDA noise, LCC OWD.

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Figure 7

Velocity frequency spectra for low and high tunnel velocities. (a) Mean velocity 0.505m∕s(1.6ft∕s),u′∕U=0.17%,fc=244Hz,Δf=0.244Hz (b) Mean velocity 14.47m∕s(47.6ft∕s),u′∕U=0.40%,fc=3376Hz,Δf=2.441Hz.



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