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Hydrodynamic characteristics of a lunate shaped oscillating propulsor

Citation

Liu, P and Bose, N, Hydrodynamic characteristics of a lunate shaped oscillating propulsor, Ocean Engineering, 26, (6) pp. 519-530. ISSN 0029-8018 (1999) [Refereed Article]


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DOI: doi:10.1016/S0029-8018(98)00018-3

Abstract

Research was conducted to study the hydrodynamic efficiency of a foil with aft-swept wing tips. A potential flow based time domain panel method was formulated to predict the performance of a lunate and rectangular foil in large amplitude, unsteady motion. Skin drag was approximated and boundary layer growth and separation were also estimated. Hydrodynamic efficiency was evaluated in terms of propulsive efficiency and thrust coefficient of the foil. Results are presented for a lunate shaped planform and for a rectangular foil. Predictions show that the lunate shaped planform has a substantially higher propulsive efficiency (13% higher) than the rectangular foil under heavy load conditions when the feathering parameter is zero, throughout a range of reduced frequencies (0.2 to 1.8). Under a medium load condition, however, the rectangular foil gave a higher propulsive efficiency at reduced frequencies less than 0.5 and the same efficiency value at a reduced frequency of 1.8. For a practical range of reduced frequencies between 0.5 and 1.0, the lunate tail gave higher propulsive efficiency. The lunate planform gave a lower thrust coefficient at a heavy load and higher thrust at a medium load condition than the rectangular planform for all reduced frequencies.

Item Details

Item Type:Refereed Article
Keywords:Hydrodynamic efficiency; Panel method; Time domain; Lunate planform
Research Division:Engineering
Research Group:Maritime Engineering
Research Field:Ocean Engineering
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in Engineering
Author:Bose, N (Professor Neil Bose)
ID Code:66803
Year Published:1999
Web of Science® Times Cited:11
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2011-02-11
Last Modified:2011-03-22
Downloads:4 View Download Statistics

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