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Effects of Hub-To-Tip Ratio and Tip Clearance on Hysteretic Characteristics of Wells Turbine for Wave Power Conversion

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Journal of Thermal Science 2002年第3期11卷 207-213页

作者： Tae-HoKim YoichiKinoue ToshiakiSetoguchi kenjikaneko Department of Mechanical Engineering Saga University Saga Japan

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. The effects of hub-to-tip ratio and tip clearance on the hysteretic characteristics of the Wells turbine have also been discussed in this paper.

关键词： Turbomachinery Wells turbine natural energy ocean wave energy wave power conversion

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Effect of End Plates on the Performence of a Wells Turbine for Wave Energy Conversion

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Journal of Thermal Science 2006年第4期15卷 319-323页

作者： Manabu Takao Toshiaki Setoguchi YoichiKinoue kenjikaneko Department of Mechanical Engineering Matsue National College of Technology 14-4 Nishiikuma-choMatsue-shiShimane 690-8518Japan Institute of Ocean Energy Saga University1 Honjo-machiSaga-shiSaga 840-8502Japan Department of Mechanical Engineering Saga University1 Honjo-machiSaga-shiSaga 840-8502Japan

In order to improve the performance of the Wells turbine for wave energy conversion, the effect of end plates on the turbine characteristics has been investigated experimentally by model testing under steady flow conditions. The end plate attached to the tip of the original rotor blade is slightly larger than the original blade profile. The characteristics of the Wells turbine with end plates have been compared with those of the original Wells turbine, i.e., the turbine without end plate. As a result, it has been concluded that the characteristics of the Wells turbine with end plates are superior to those of the original Wells turbine and the characteristics are dependent on the size and position of end plate. Furthermore, the effect of annular plate on the turbine performance, which encircles the turbine and is attached to the tip, was investigated as an additional experiment. However, its device was not effective in improving the turbine characteristics.

关键词： fluid machinery natural energy Wells turbine end plate wave energy conversion ocean energy.

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Passive Control of Transonic Flow Fields with Shock Wave Using Non-equilibrium Condensation and Porous Wall

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Journal of Thermal Science 2003年第2期12卷 126-131页

作者： MasanoriTanaka Shigerumatsuo ToshiakiSetoguchi kenjikaneko Heuy-DongKim ShenYu DepartmentofmechanicalEngineering Sagauniversity1Honjo-machiSaga-shiSaga840-8502Japan SchoolofMechanicalEngineering CollegeofNaturalScienceAndongNationalUniversity388Song-CheonDongAndongKyung-PookKorea InstituteofEngineeringThermophysics ChineseAcademyofSciencesP.O.Box2706Beijing100080China

When non-equilibrium condensation occurs in a supersonic flow field, the flow is affected by the latent heat released. In the present study, in order to control the transonic flow field with shock wave, a condensing flow was produced by an expansion of moist air on a circular bump model and shock waves were occurred in the supersonic parts of the fields. Furthermore, the additional passive technique of shock / boundary layer interaction using the porous wall with a cavity underneath was adopted in this flow field. The effects of these methods on the shock wave characteristics were investigated numerically and experimentally. The result obtained showed that the total pressure loss in the flow fields might be effectively reduced by the suitable combination between non-equilibrium condensation and the position of porous wall.

关键词： compressible flow non-equilibrium condensation boundary layer flow control.

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