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APPENDIX - HYDROFOIL TIP BOUND AY LAYER THICKNESS AND 



ROUGHNESS HEIGHT 51 



REFERENCES 53 



LIST OF FIGURES 



1 - Tip-Vortex Rollup Process 2 



2 - Tip Vortex Tangential Velocity Distribution x 4 



3 - Tip Vortex Tangential Velocity as a Function of Core Radius 



for Laminar and Turbulent Flow 4 



4 - Mapping of the Flowfield About a Wing Tip for Various Non- 



dimensional Chordwise Distances 6 



5 - Schematic of 24-Inch Variable Pressure Water Tunnel 



Arrangement Showing Semiclosed Jet Test Section 



and Model 9 



6 - Nondimensional Section Offsets of the Parent Foil 11 



7 - Photograph and Spanwise Thickness Distribution for the 



Small and Large Bulbous Tips 12 



8 - Overall and Closeup Views of 600 Micron Roughness Applied 



to the Parent Foil Pressure Side 13 



9 - Passive Mass Injection Tip 15 



10 - Active Mass Injection Nozzle 15 



11 - Model Mounting and Measuring Apparatus 16 



12 - Velocity Profiles Across Two-Dimensional Test Section. . 19 



13 - Paint Flow Pattern — Parent Foil Pressure Side at a = 0.5 Degrees 



and R = 5 x lo^ 22 



c 



14 - Paint Flow Pattern — Parent Foil Suction Side at a = 10 Degrees 



and R = 5 x lo^ 23 



c 



15 - Tip Vortex Cavitation Development — Parent Foil 25 



16 - Core Radius of Cavitating Tip Vortex as a Function of Cavitation 



Index a and Angle of Attack a — Parent Foil 26 



