Book contents
- Frontmatter
- Contents
- Preface
- Nomenclature
- Abbreviations
- Figure Acknowledgements
- 1 Introduction
- 2 Propulsive Power
- 3 Components of Hull Resistance
- 4 Model-Ship Extrapolation
- 5 Model-Ship Correlation
- 6 Restricted Water Depth and Breadth
- 7 Measurement of Resistance Components
- 8 Wake and Thrust Deduction
- 9 Numerical Estimation of Ship Resistance
- 10 Resistance Design Data
- 11 Propulsor Types
- 12 Propeller Characteristics
- 13 Powering Process
- 14 Hull Form Design
- 15 Numerical Methods for Propeller Analysis
- 16 Propulsor Design Data
- 17 Applications
- Appendix A1 Background Physics
- Appendix A2 Derivation of Eggers Formula for Wave Resistance
- Appendix A3 Tabulations of Resistance Design Data
- Appendix A4 Tabulations of Propulsor Design Data
- Index
- References
16 - Propulsor Design Data
Published online by Cambridge University Press: 07 September 2011
- Frontmatter
- Contents
- Preface
- Nomenclature
- Abbreviations
- Figure Acknowledgements
- 1 Introduction
- 2 Propulsive Power
- 3 Components of Hull Resistance
- 4 Model-Ship Extrapolation
- 5 Model-Ship Correlation
- 6 Restricted Water Depth and Breadth
- 7 Measurement of Resistance Components
- 8 Wake and Thrust Deduction
- 9 Numerical Estimation of Ship Resistance
- 10 Resistance Design Data
- 11 Propulsor Types
- 12 Propeller Characteristics
- 13 Powering Process
- 14 Hull Form Design
- 15 Numerical Methods for Propeller Analysis
- 16 Propulsor Design Data
- 17 Applications
- Appendix A1 Background Physics
- Appendix A2 Derivation of Eggers Formula for Wave Resistance
- Appendix A3 Tabulations of Resistance Design Data
- Appendix A4 Tabulations of Propulsor Design Data
- Index
- References
Summary
Introduction
General
The methods of presenting propeller data are described in Section 12.1.3. A summary of the principal propulsor types is given in Chapter 11. It is important to note that different propulsors are employed for different overall design and operational requirements. For example, a comparison of different propulsors based solely on efficiency is shown in Figure 16.1, [16.1]. This does not, however, take account of other properties such as the excellent manoeuvring capabilities of the vertical axis propeller, the mechanical complexities of the highly efficient contra-rotating propeller or the restriction of the higher efficiency of the ducted propeller to higher thrust loadings.
As described in Chapter 2, the propeller quasi-propulsive coefficient ηD can be written as follows: where ??O is the propeller open water efficiency, and ??H is the hull efficiency, defined as follows: where t is the thrust deduction factor, and wT is the wake fraction. ??R is the relative rotative efficiency. Data for the components of ??H and ??R are included in Section 16.3.
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- Ship Resistance and PropulsionPractical Estimation of Propulsive Power, pp. 369 - 417Publisher: Cambridge University PressPrint publication year: 2011