Fig. 1. Schematic diagram of the circulating water tunnel
Fig. 2. Vertical blades array installed in the test section
Fig. 3. Vector plot and contour plot of streamwise velocity fluctuation in xz-plane at y = 1mm (y+ = 25); (a) without blade, (b) with blade
Fig. 4. Vector plot and contour plot of streamwise velocity fluctuation in xz-plane at y = 4mm (y+ = 100); (a) without blade, (b) with blade
Fig. 5. Vector plot and contour plot of streamwise velocity fluctuation in xz-plane at y = 9mm (y+ = 225); (a) without blade, (b) with blade
Fig. 6. Blade geometry and naming convention
Fig. 7. Photo of outer-layer vertical blades
Fig. 8. 300K KVLCC2 model ship installed with acrylic boxes at side and bottom
Fig. 9. Photograph of the bottom of 7, 11, 15 station installed vertical blades of various length
Fig. 10. Total resistance with various blade (h/δ≈0.5) installation locations
Fig. 12. EHP versus ship speed with various blade(h/δ≈0.5) installation locations
Fig. 11. Effect of blade(h/δ≈0.5) installation locations on percentage CTM reduction
Table 1. Results of boudary layer thickness
Table 2. Blade geometry variables: height
Table 3. Blade geometry variables: spanwise packing
Table 4. Principal particulars of KVLCC2
Table 5. Comparison of CTM reduction by blade length (h/δ)
References
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- Adrian, R. J., Meinhart, C. D. and Tomkins, C. D., 2000, "Vortex organization in the turbulent boundary layer," J. Fluid Mech., vol. 422, pp.1-54. https://doi.org/10.1017/S0022112000001580
- Park, H., An, N. H., Hutchins, N., Choi, K-S., Chun, H. H. and Lee, I., 2011, Experimental Investigation on the Drag Reducing Efficiency of the Outer-layer Vertical Blades, Journal of Marine Science and Technology, vol. 16, no. 4, pp.390-401 https://doi.org/10.1007/s00773-011-0135-0
- Moffat, R.J., 1982, Contributions to the theory of single-sample uncertainty analysis, Trans ASME J Fluid Eng, vol. 104, pp.250-260. https://doi.org/10.1115/1.3241818