Effect of Blade Shape on the Performance of Wells Turbine for Wave Energy Conversion
The effect of a 3-dimensional (3D) blade on the turbine characteristics of Wells turbine for wave energy conversion has been investigated experimentally by model testing under steady flow conditions in this study, in order to improve the peak efficiency and stall characteristics. The aim of use of 3D blade is to prevent flow separation on the suction surface near the tip. The chord length is constant with radius and the blade profile changes gradually from the mean radius to tip. The proposed blade profiles in the study are NACA0015 from the hub to mean radius and NACA0025 at the tip. The performances of Wells turbine with 3D blades has been compared with those of the original Wells turbine, i.e., the turbine with 2-dimensional (2D) blades. As a result, it was concluded that although the peak efficiency of Wells turbine can be improved by the use of the proposed 3D blade, its blade does not overcome the weakness of stalling.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1337837Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 3176
 S. Raghunathan, “The Wells Air Turbine for Wave Energy Conversion,” Progress in Aerospace, vol. 31, pp. 335-386, (1995).
 T. Setoguchi, M. Takao, K. Kaneko and M. Inoue, “Effect of Guide Vanes on the Performance of a Wells Turbine for Wave Energy Conversion,” International Journal of Offshore and Polar Engineering, vol. 8, no. 2, pp. 155-160, (1998).
 T. Setoguchi, M. Takao, K. Kaneko, S. Raghunathan and M. Inoue, “Study on a Wells Turbine for Wave Power Conversion: Improvement of Performance by the Use of Porous Fences,” International Journal of Offshore and Polar Engineering, vol. 8, no. 3, pp. 222-227, (1998).
 M. Takao, S. Okuhara and T. Setoguchi, “Wells Turbine for Wave Energy Conversion -Improvement of stall characteristics by the use of 3-Dimensional Blades-“, Proceedings of 4th International Conference on Jets, Wakes and Separated Flows, Nagoya, Japan, Paper no. ICJWSF2013-1151, (2013).
 K. Kaneko, T. Setoguchi, and M. Inoue, “Performance of Wells Turbine in Oscillating Flow”, Proc Current Practices and New Tech in Ocean Eng, ASME, vol. 2, pp. 447-452, (1986).
 T. Setoguchi, K. Kaneko, and M. Inoue, Determine of Optimum Geometry of Wells Turbine Rotor for Wave Power Generator, Proc 3rd Symp on Ocean Wave Utilz (in Japanese), JAMSTEC, pp. 141-149, (1986).