. Effects of turbulence stimulators on the boundary layer and resistance of a ship model as detected by hot wires. Turbulent boundary layer. U = 1.0 knot Rx = 2.5x10 ^=â = 0.198 -^==0.03 R=43xl05. 0.03 R = 52 -77x10 0.032" Trip Wire Around Girth- £ F 7 U = 0.80 knot 4= = 0.158 Rx= 4.8x10 U = 2.0-3.5 knots Râ = 5 -8.8x10 R = 34xl05 4^ = 0.396-0.693 -g1 = 0.003 R = 86-I50xl05 Figure 16 - Boundary Layer Plow Conditions on Tanker Model with Trip Wire as Turbulence Stimulator the greater flow velocity toward the turn of the bilge. This probably ex- plains the observed pattern of transition sh

- Image ID: RDD23P
. Effects of turbulence stimulators on the boundary layer and resistance of a ship model as detected by hot wires. Turbulent boundary layer. U = 1.0 knot Rx = 2.5x10 ^=â = 0.198 -^==0.03 R=43xl05. 0.03 R = 52 -77x10 0.032" Trip Wire Around Girth- £ F 7 U = 0.80 knot 4= = 0.158 Rx= 4.8x10 U = 2.0-3.5 knots Râ = 5 -8.8x10 R = 34xl05 4^ = 0.396-0.693 -g1 = 0.003 R = 86-I50xl05 Figure 16 - Boundary Layer Plow Conditions on Tanker Model with Trip Wire as Turbulence Stimulator the greater flow velocity toward the turn of the bilge. This probably ex- plains the observed pattern of transition sh
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Image ID: RDD23P
. Effects of turbulence stimulators on the boundary layer and resistance of a ship model as detected by hot wires. Turbulent boundary layer. U = 1.0 knot Rx = 2.5x10 ^=â = 0.198 -^==0.03 R=43xl05. 0.03 R = 52 -77x10 0.032" Trip Wire Around Girth- £ F 7 U = 0.80 knot 4= = 0.158 Rx= 4.8x10 U = 2.0-3.5 knots Râ = 5 -8.8x10 R = 34xl05 4^ = 0.396-0.693 -g1 = 0.003 R = 86-I50xl05 Figure 16 - Boundary Layer Plow Conditions on Tanker Model with Trip Wire as Turbulence Stimulator the greater flow velocity toward the turn of the bilge. This probably ex- plains the observed pattern of transition shown in Figure l6 where it is seen that transition occurs closer to the stem with increasing depth along the hull, Condition 4 - Stimulation by Sand Strip Data obtained from the boundary-layer survey made with the fine- grain sand-strip are summarized in Figure 18. The pattern of the flow aft of the sand strip at low speeds was found to be considerably different from that obtained with the trip wire. COMPARISON OF EFFECTIVENESS OF VARIOUS STIMULATORS A summary of the boundary layer surveys made with the various meth- ods of stimulation is given in Figure 19- Here it may be seen that the 1/8- inch rod at 48 diameters is more effective in producing a turbulent boundary layer than any of the other devices. However, it must be remembered that this is a qualitative study and hence there is no guarantee that the intensity and scale of turbulence induced by the rod are of the proper magnitude. Quanti- tative determination of the intensity and scale of turbulence under basin. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Breslin, John P; Macovsky, Morris S; David W. Taylor Model Basin. Washington, D. C. : Dept. of the Navy, David Taylor Model Basin

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