Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 07, 2019 - November 08, 2019
In order to clarify the effects of freestream turbulence on blade performance, wind tunnel experiments by using turbulence grids, fractal grids and an active turbulence generators were conducted. The results showed that it is possible to investigate the flow field around airfoil is placed in a strong turbulence field with the inertial sub range in the frequency domain such as an atmospheric turbulence by using the active turbulence generator. In this experimental conditions, the Reynolds number around 105, it was confirmed that when the intensity of turbulence increases, the stall angle increases and the sudden drop in lift after the stall is suppressed. It was also found that the drag increases when the freestream turbulence becomes large. From this result, it can be seen that blade performance of the offshore wind turbines is strongly affect by free-stream turbulence.
