Effects of hub-to-tip ratio and reynolds number on the performance of impulse turbine for wave energy power plant

The objective of this paper is to present the performance comparison of the impulse turbines for different diameters. In the study, the investigation has been performed experimentally by model testing for some diameters, especially 0.3 m and 0.6 m. The experiment was performed for Reynolds number range of 0.17 X 105—1.09X 105 and for different values of hub-to-tip ratiov ranging from 0.6 to 0.85. As a result, it was found that the critical Reynolds number is to be around 0.5 X 105 for v=0.6 and 0.4X 105 for v=0.7. For the hub-to-tip ratio, the optimum value is 0.7 when the turbine is operated at lower Reynolds number. However, its value seems to be 0.6 at higher Reynolds number in the tested range.