Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 19, 2024 - November 20, 2024
In this study, two Savonius wind turbines were placed in close proximity, and their relative positions were varied to investigate the effect on wake profile. Each turbine consists of three semi-circular blades, and the analysis was conducted by changing the combination of the rotational direction of the turbines and the distance between them as parameters. First, the temporal variation of the instantaneous velocity profiles was obtained for each arrangement across different measurement regions. Next, a Proper Orthogonal Decomposition (POD) analysis was performed on the data. To extend the POD analysis to the entire measurement region, two-point velocity correlations measured in each local region were combined. The results showed that the velocity deficit and its fluctuations were minimized when the turbines were spaced 1.5D, where D is turbine diameter, apart in a counter-rotating configuration, where the gap flow moved upstream. Furthermore, a comparison between the POD modes of each local region and the entire region revealed that the mode profiles were consistent with one another. These findings suggest that information extracted independently from local regions can effectively represent the temporal and spatial variations across the entire measurement region.
