CIJIIT'RE FOR !lo'EVo1'0illiDl.AN0 \I I '1>11 \ TOTAL OF 10 PACES ONLY JI.1A Y BE X£ROXED (Wuboot Author'• VconWi(lln) EXPERIMENTAL INVESTIGATION OF THE INFLUENCE OF HUB TAPER ANGLE ON THE PERFORMANCE OF PUSH AND PULL CONFIGURATION PODDED PROPELLERS by ©ROCKY SCOTT TAYLOR A thesis submitted to the School of Graduate Studies in partial fulfillment of the requirements for the degree of Master of Engineering Faculty of Engineering and Applied Science Memorial University of Newfoundland May 2006 St. John's Newfoundland Canada Library and Bibliotheque et 1+1 Archives Canada Archives Canada Published Heritage Direction du Branch Patrimoine de !'edition 395 Wellington Street 395, rue Wellington Ottawa ON K1A ON4 Ottawa ON K1A ON4 Canada Canada Your file Votre reference ISBN: 978-0-494-19404-1 Our file Notre reference ISBN: 978-0-494-19404-1 NOTICE: AVIS: The author has granted a non­ L'auteur a accorde une licence non exclusive exclusive license allowing Library permettant a Ia Bibliotheque et Archives and Archives Canada to reproduce, Canada de reproduire, publier, archiver, publish, archive, preserve, conserve, sauvegarder, conserver, transmettre au public communicate to the public by par telecommunication ou par !'Internet, preter, telecommunication or on the Internet, distribuer et vendre des theses partout dans loan, distribute and sell theses le monde, a des fins commerciales ou autres, worldwide, for commercial or non­ sur support microforme, papier, electronique commercial purposes, in microform, et/ou autres formats. paper, electronic and/or any other formats. The author retains copyright L'auteur conserve Ia propriete du droit d'auteur ownership and moral rights in et des droits moraux qui protege cette these. this thesis. Neither the thesis Ni Ia these ni des extraits substantiels de nor substantial extracts from it celle-ci ne doivent etre imprimes ou autrement may be printed or otherwise reproduits sans son autorisation. reproduced without the author's permission. In compliance with the Canadian Conformement a Ia loi canadienne Privacy Act some supporting sur Ia protection de Ia vie privee, forms may have been removed quelques formulaires secondaires from this thesis. ant ete enleves de cette these. While these forms may be included Bien que ces formulaires in the document page count, aient inclus dans Ia pagination, their removal does not represent il n'y aura aucun contenu manquant. any loss of content from the thesis. ••• Canada Abstract The influence of propeller hub taper angle and mode of operation on open water baseline and podded propeller performance have been experimentally evaluated for push and pull mode propellers with 15° and 20° hub taper angles. Results from two series of experiments considering performance with and without the presence of the pod and strut geometry are presented. Discussions of the testing methods used for 'propeller only' tests and 'podded propeller unit' tests have been provided. Limitations of these methods are included and test procedures to evaluate the influence of fairing adapters on 'propeller only' results are suggested. The effect of hub taper angle on both 'propeller only' and 'podded propeller unit' performance are provided along with suggestions of how these findings may be used to better adapt propeller designs to the operational profile of the vessel. Variation in performance as a function of mode of operation is described, along with discussion of potential causes of observed differences. Recommendations are provided to guide future research in this area. Experimental uncertainty analysis methods and results are detailed for both 'propeller only' tests and for 'podded propeller unit' tests. Approaches to reduce uncertainty levels in future experiments are suggested. - ii - Acknowledgments I would like to extend my sincere gratitude to Dr. Brian Veitch for his enthusiastic support and guidance throughout the course of my studies. His personal dedication and commitment to excelling in his field of research were crucial elements in helping me decide to pursue higher education. I would also like to thank Dr. Neil Bose for his expert feedback throughout my program, as well as Dr. Bruce Colbourne for helping me put the finishing touches on my thesis. For their financial support, I would like to thank NSERC, the Associate Dean's Office and the School of Graduate Studies. Thanks to SNAME for their support, in addition to the many opportunities I have had to expand my professional development through involvement with their organization. Special thanks to Moya Crocker and the staff in the S.J Carew building for the years of help on my journey through the program. I would also like to thank the other graduate students who I have had the privilege of working with on this project, particularly Andrew MacNeill. His expert knowledge of design, manufacturing and practical engineering principles have been pivotal to the technical viability and success of this project. His commitment to quality and innovation has had a profound impact on my own perspective of problem solving and design engineering. It was a privilege to study and learn from him the many things that can never be learned from books or courses. For this I am truly grateful. I would also like to thank the staff at lOT and OERC, particularly Jim Gosse, for helping me throughout the course of my testing program. Thanks to the crew at MUN Technical Services for their practical insights and quality craftsmanship. - iii - Finally, I would like to express my gratitude for those who motivate and support me in all that I do in life: Alexander, Skye and my parents, Lloyd and Kay. Your love is the foundation upon which I build my life. - iv- Table of Contents Abstract ............................................................................................................... ii Acknowledgments ............................................................................................. iii List of Tables ...................................................................................................... vi List of Figures .................................................................................................... ix List of Appendices ............................................................................................ xii Chapter 1 - Introduction ..................................................................................... 1 1 .1 Aim ............................................................................................................. 1 1.2 Scope ......................................................................................................... 1 1.3 Background ................................................................................................ 2 1.4 Overview of Podded Propellers .................................................................. 4 1.5 Why Pods Have Become So Popular. ........................................................ 6 1.6 Current Problems within the Research Community .................................... 7 1. 7 Addressing These Problems .................................................................... 10 1.8 Data Reduction Equations ........................................................................ 12 Chapter 2 - Literature Survey .......................................................................... 18 - ii - 2.1 Scope ....................................................................................................... 18 2.2 Hydrodynamic Considerations ................................................................. 18 2.3 Related Experimental Work ...................................................................... 25 2.4 Commercial Applications .......................................................................... 28 2.5 Military Applications .................................................................................. 31 Chapter 3 - Experimental Apparatus .............................................................. 34 3.1 Scope ....................................................................................................... 34 3.2 Model Propeller Geometry ....................................................................... 34 3.3 Model Pod Shell and Strut Geometry ....................................................... 37 3.4 Instrumentation for Baseline Propeller Experiments ................................ 39 3.5 Instrumentation for Podded Propeller Experiments .................................. 43 Chapter 4 - Methodology .................................................................................. 46 4.1 Scope ....................................................................................................... 46 4.2 Instrumentation Calibration ...................................................................... 46 4.3 Testing Procedures .................................................................................. 51 Chapter 5 - Results ........................................................................................... 56 5.1 Scope ....................................................................................................... 56 5.2 Assessment of the Influence of Reynolds Number ................................... 56 - iii - 5.3 Baseline Propeller Open Water Test Results ........................................... 60 5.4 Podded Propeller Open Water Test Results ............................................ 66 5.5 Influence of Propeller Hub Taper Angle ..................................................