Effects of turbulence stimulators on the boundary layer and resistance of a ship model as detected by hot wires effectsofturbule00bres Year: 1950 10 TM8 MODEL 4083 MODEL OF 612-FX TANKER LINEAR RATIO 24. MODEL LENGTH 255 FT EQUIPPED WITH HOT-WIRE PROBES FOR BOUNDARY LAYER SURVEY FRICTIONAL RESISTANCE RESEARCH NS 715-DS2 >.Sl â '*&â ' TMB 41461 Figure 6 - TMB Model 4083 Showing Distribution of Hot-Wire Probes with Insert Enlargement of 4 Probes the model showed turbulent flow. The second check consisted of moving a hot- wire probe in and out of the boundary layer by means of
Effects of turbulence stimulators on the boundary layer and resistance of a ship model as detected by hot wires effectsofturbule00bres Year: 1950 10 TM8 MODEL 4083 MODEL OF 612-FX TANKER LINEAR RATIO 24. MODEL LENGTH 255 FT EQUIPPED WITH HOT-WIRE PROBES FOR BOUNDARY LAYER SURVEY FRICTIONAL RESISTANCE RESEARCH NS 715-DS2 >.Sl â '*&â ' TMB 41461 Figure 6 - TMB Model 4083 Showing Distribution of Hot-Wire Probes with Insert Enlargement of 4 Probes the model showed turbulent flow. The second check consisted of moving a hot- wire probe in and out of the boundary layer by means of a micrometer screw. When the wire was within of the surface the response of the wire was characteristic of turbulence. The intensity of turbulence decays toward the 'edge' of the layer and beyond this the flow was found to be without fluctuation. TEST CONDITIONS Surveys of the boundary-layer flow were made under four conditions. For the first condition the model was towed without any turbulence stimulator. For the second, a series of tests were conducted in which a 1/8-inch rod, held vertically in the water, was placed successively at 24, 48, and 192 diameters forward of the model stem, , at 3 in., 6 in., and 24 in., respectively. For the third condition, records-of the boundary-layer flow aft of a inch trip wire, tacked around the girth of the model, were obtained. Finally, similar measurements were made with a fine-grain sand strip, 7/8-inch wide, in place of the trip wire. Location of these stimulators and their pertinent dimensions are given in Figure 9. For each of these conditions of stimulation the model was ballasted to correspond to the ship displacement of 33,950 tons of sea water at zero trim. The model was towed at 15 speeds in the range be- tween and knots corresponding to 1-96 and 17-15 knots for the ship.
Size: 3159px × 633px
Photo credit: © Bookend / Alamy / Afripics
License: Licensed
Model Released: No
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