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1 - Introduction

Published online by Cambridge University Press:  07 September 2011

Anthony F. Molland ,
Stephen R. Turnock  and
Dominic A. Hudson
Anthony F. Molland
Affiliation:
University of Southampton
Stephen R. Turnock
Affiliation:
University of Southampton
Dominic A. Hudson
Affiliation:
University of Southampton
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Summary

The estimation of ship propulsive power is fundamental to the process of designing and operating a ship. A knowledge of the propulsive power enables the size and mass of the propulsion engines to be established and estimates made of the fuel consumption and operating costs. The estimation of power entails the use of experimental techniques, numerical methods and theoretical analysis for the various aspects of the powering problem. The requirement for this stems from the need to determine the correct match between the installed power and the ship hull form during the design process. An understanding of ship resistance and propulsion derives from the fundamental behaviour of fluid flow. The complexity inherent in ship hydrodynamic design arises from the challenges of scaling from practical model sizes and the unsteady flow interactions between the viscous ship boundary layer, the generated free-surface wave system and a propulsor operating in a spatially varying inflow.

Up to the early 1860s, little was really understood about ship resistance and many of the ideas on powering at that time were erroneous. Propeller design was very much a question of trial and error. The power installed in ships was often wrong and it was clear that there was a need for a method of estimating the power to be installed in order to attain a certain speed.

Type
Chapter
Information
Ship Resistance and Propulsion
Practical Estimation of Propulsive Power
 , pp. 1 - 6
Publisher: Cambridge University Press
Print publication year: 2011

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