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Thrust Caused by Oscillating Two-Dimensional Hydrofoil Moving in Propagating Unsteady Flow Field
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 Title & Authors
Thrust Caused by Oscillating Two-Dimensional Hydrofoil Moving in Propagating Unsteady Flow Field
Choi, Yoon-Rak;
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This paper considers a two-dimensional hydrofoil that is fully submerged and oscillating with forward speed. The flow field is assumed to be a propagating vertical velocity field. Using the perturbation theory, the problem is linearized, and the leading-order lift force is surveyed. The thrust force is analytically derived as the second-order horizontal force. As an example, the lift and thrust for a flapping flat plate in heaving and pitching modes are analyzed. The parameters affecting the thrust are listed. The thrust is expressed in terms of the quadratic transfer functions in relation to the disturbances. The quadratic transfer functions are studied parametrically to assess the most favorable thrust.
Thrust;Unsteady flow filed;Oscillating hydrofoil;Analytic approach;
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동요하는 날개를 이용한 파랑 중 선박의 추력발생,최윤락;

한국해양공학회지, 2013. vol.27. 1, pp.31-36 crossref(new window)
Propulsion by Oscillating Foil Attached to Ship in Waves, Journal of Ocean Engineering and Technology, 2013, 27, 1, 31  crossref(new windwow)
Garrick, I.E. (1936) "Propulsion of a Flapping and Oscillating Airfoil", N.A.C.A. Report, No 567.

Greenberg, J.M. (1947) "Some Consideration on an Airfoil in an Oscillating Stream", N.A.C.A. Technical Note, No 1372.

Grue, J., Mo, A. and Palm, E. (1988). "Propulsion of a Foil Moving in Water Waves", J. of Fluid Mech., Vol 186, pp 393-417. crossref(new window)

Kaplan, P. (1955) "A Hydrodynamic Theory for the forces on Hydrofoils in Unsteady Motion", Sc.D. Thesis, Stevens Institute of Technology.

Newman, J.N. (1977) "Marine Hydrodynamics", The MIT Press, Cambridge, MA.

Sears, W.R. (1941) "Some Aspects of Non-stationary Airfoil Theory and Its Practical Application", J. of Aeronautical Sciences, Vol 8, No 3, pp 104-108. crossref(new window)

Theodorsen, T. (1935) "General Theory of Aerodynamic Instability and the Mechanism of Flutter", N.A.C.A. Report, No 496.

von Karman, T.H. and Sears, W.R. (1938). "Airfoil Theory for Non-uniform Motion", J. of Aeronautical Sciences, Vol 5, No 10, pp 379-390.

Wu, T.Y. (1971). "Hydrodynamics of Swimming Propulsion. Part 1. Swimming of a Two-Dimensional Flexible Plate at Variable Forward Speeds in an Inviscid Fluid", J. of Fluid Mech., Vol 46, No 2, pp337-355. crossref(new window)