Mechanism of Hysteretic Characteristics of Wells Turbine for Wave Power Conversion
Author:
Kinoue Y.1, Setoguchi T.1, Kim T. H.1, Kaneko K.1, Inoue M.2
Affiliation:
1. Department of Mechanical Engineering, Saga University, 1, Honjo Saga 840-8502, Japan 2. Department of Mechanical Engineering Science, Kyushu University, 6-10-1 Hakozaki, Higashi-ku Fukuoka 812-8581, Japan
Abstract
A Wells turbine for wave power conversion has hysteretic characteristics in a reciprocating flow. The counterclockwise hysteretic loop of the Wells turbine is opposite to the clockwise one of the well-known dynamic stall of an airfoil. In this paper, the mechanism of the hysteretic behavior was elucidated by an unsteady three-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 the change in the blade circulation.
Publisher
ASME International
Subject
Mechanical Engineering
Reference9 articles.
1. Inoue, M., Kaneko, K., Setoguchi, T., and Simamoto, K., 1985, “Studies on Wells Turbine for Wave Power Generator (4th Report, Starting and Running Characteristics in Periodically Oscillating Flow),” Trans. Jpn. Soc. Mech. Eng., Ser. B, 51(468), pp. 2746–2751 (in Japanese). 2. Inoue, M., Kaneko, K., Setoguchi, T., and Koura, F., 1987, “Hysteretic Characteristics of Wells Turbine in Reciprocating Flow,” Trans. Jpn. Soc. Mech. Eng., Ser. B, 53(496), pp. 3699–3704 (in Japanese). 3. Setoguchi, T., Kaneko, K., Hamakawa, H., and Inoue, M., 1990, “Measurement of Hysteresis on Wells Turbine Characteristics in Reciprocating Flow,” Proc. 1st International Symposium on Experimental and Computational Aerothermodynamics of Internal Flows, ISECAIF, Beijing, China, pp. 537–543. 4. Alcorn, R. G., and Beattie, W. C., 1998, “Observations of Time domain Data on Wells Turbine in the Islay Wave-Power Plant,” Proc. 8th International Offshore and Polar Engineering Conference, ISOPE, Cupertino, CA, 1, pp. 81–85. 5. Ericsson, L. E., and Reding, J. P., 1987, “Fluid Dynamics of Unsteady Separated Flow, Part II. Lifting Surfaces,” Prog. Aerosp. Sci., 24, pp. 249–356.
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