. Effects of turbulence stimulators on the boundary layer and resistance of a ship model as detected by hot wires . Brass Tube Inserted Flush to Hull Surface ; ; Lead Sulphide Stain Enlargement of Hull Surface at Point where Hydrogen Sulphide is Ejected at a Fixed Towing Speed Figure 4 Technique Used for Orientation of Hot Wire at Selected Positions on Tanker Model Classification of the flow at a probe is accomplished by interpret- ing the signal obtained from the probe. Typical "signatures" of laminar, transitional, and turbulent flow are shown in Figur
. Effects of turbulence stimulators on the boundary layer and resistance of a ship model as detected by hot wires . Brass Tube Inserted Flush to Hull Surface ; ; Lead Sulphide Stain Enlargement of Hull Surface at Point where Hydrogen Sulphide is Ejected at a Fixed Towing Speed Figure 4 Technique Used for Orientation of Hot Wire at Selected Positions on Tanker Model Classification of the flow at a probe is accomplished by interpret- ing the signal obtained from the probe. Typical "signatures" of laminar, transitional, and turbulent flow are shown in Figure 7- It may be seen that transition extends over a range of speeds, or more properly, of Reynolds num- bers. These are based on a length measured from the bow along the half-draft water line to the start of the transition region. Furthermore, the occurrence of the turbulent bursts within the transitional range steadily increases until the flow becomes completely turbulent. There is another flow condition which for brevity has been omitted in Figure 7 and is represented in detail in Fig- ure 8. This flow is laminar with low-frequency oscillations and is similar to the "laminar oscillations" observed in the boundary layer of a flat plate by Schubauer and Skramstad3 except that the oscillations in Figure 8 are much more random than those reported in the earlier investigation. These laminar oscillations grow in magnitude and increase in frequency with increase in speed at a given point in the boundary layer until turbulent bursts occur.
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