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The tidal and sea current turbines are one of potential sources for utilization of natural energies. When applying them to the actual sea, it is necessary to evaluate how much increase of hydro forces acting on the turbines, and to examine if any drop or increase of electrical generation due to waves. Therefore, we conducted 2-dimensional tank tests in the current, both wave and current to measure the loads, rotational speed and output volts induced in the 1/100 scale turbine. As simple stream tube theory often apply to analyze a turbine in uniform flow, so we use it for the analyses of hydro forces and energy outputs of the turbine in coexistence of wave and current. The paper presented the comparison the model tests results with the theoretical calculation to clarify the effects of waves to the turbine.

A STUDY ON EFFECTS OF WAVE TO DRAG FORCES AND POWERS INDUCED IN A HYDRO TURBINE BY USING SIMPLE STREAM TUBE THEORY