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Numerical Investigations of Hysteretic Characteristics on Wells Turbine

[+] Author Affiliations
Y. Kinoue, T. Setoguchi, T. H. Kim, K. Kaneko

Saga University, Saga, Japan

M. Inoue

Kyushu University, Fukuoka, Japan

Paper No. FEDSM2002-31207, pp. 973-979; 7 pages
doi:10.1115/FEDSM2002-31207
From:
  • ASME 2002 Joint U.S.-European Fluids Engineering Division Conference
  • Volume 2: Symposia and General Papers, Parts A and B
  • Montreal, Quebec, Canada, July 14–18, 2002
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 0-7918-3616-9 | eISBN: 0-7918-3600-2
  • Copyright © 2002 by ASME

abstract

A Wells turbine for wave power conversion has hysteretic characteristics in a reciprocating flow. The hysteretic loop is opposite to the well-known dynamic stall of an airfoil. In this paper, the mechanism of the hysteretic behavior was elucidated by an unsteady 3-dimensional Navier-Stokes numerical simulation. It was found that the hysteretic behavior was associated with a streamwise vortical flow appearing near the blade suction surface. In the accelerating process of axial flow velocity, the vortex is intensified to enlarge the flow separation area on the blade suction surface. In the decelerating flow process, the flow separation area is reduced because of the weakened vortex. Therefore, the aerodynamic performance in the accelerating flow process is lower than in the decelerating flow process, unlike the dynamic stall. Based on the vortex theorem, the mechanism to vary the intensity of the vortex can be explained by the trailing vortices associated with change in the blade circulation.

Copyright © 2002 by ASME
Topics: Wells , Turbines

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