Performance of Chordwise Flexible Oscillating Propulsors Using a Time-Domain Panel Method

Article type: Research Article

Authors: Bose, N.

Affiliations: Ocean Engineering Research Centre, Memorial University of Newfoundland, St. John's, Newfoundland, A1B 3X5, Canada

Abstract: A two-dimensional time-domain constant potential panel method was used for analysis of chordwise flexible oscillating hydrofoils as oscillating propulsors. The oscillatory motions as well as the chordwise deflections were of large amplitude. Results are presented of propulsive thrust coefficient and efficiency over ranges of motion parameters including varied reduced frequency, pitch amplitude and feathering parameter; heave amplitude/chord ratio; pitching axis position; phase between pitching and heaving motions; and deflected shape. The ranges were taken about a favourable operating point for a flexible oscillating NACA 0012 foil. A peak in propulsive efficiency was found for each motion parameter variation studied. Propulsive efficiency varied strongly with changes in heave amplitude/chord ratio, pitch amplitude and phase between heaving and pitching motions, but less strongly for variations in pitching axis position and flexibility.

DOI: 10.3233/ISP-1995-4243201

Journal: International Shipbuilding Progress, vol. 42, no. 432, pp. 281-294, 1995