TABLE OF CONTENTS 



Page 



LIST OF FIGURES iv 



LIST OF TABLE vi 



LIST OF ABBREVIATIONS AND SYMBOLS vii 



ABSTRACT 1 



ADMINISTRATIVE INFORMATION 1 



INTRODUCTION 1 



REPRESENTATION OF THE TIP-VORTEX ROLLUP PROCESS 3 



CONCEPTS FOR DELAYING TIP VORTEX CAVITATION 7 



THE BULBOUS AND ROUGHENED TIPS 7 



THE MASS INJECTED TIP— ACTIVE AND PASSIVE 8 



METHODS AND PROCEDURES 8 



FACILITY 8 



MODELS 10 



Parent 10 



Bulb 10 



Roughness 10 



Mass Injection 12 



MEASURING AND MOUNTING APPARATUS 14 



FLOW VISUALIZAITON 17 



EXPERIMENTAL PROCEDURES 18 



RESULTS AND DISCUSSION 20 



TIP VORTEX CHARACTERISTICS — PARENT FOIL 



FLOW VISUALIZATION 20 



FORCES AND TIP VORTEX CAVITATION INCEPTION 27 



TIP VORTEX CAVITATION DELAY CONCEPTS 30 



Roughened Tip 30 



Bulbous Tip 38 



Passive Mass Injection Tip 43 



Active Mass Injected Tip 45 



SUMMARY AND CONCLUSIONS 47 



