open access

https://hdl.handle.net/2115/93972

On the rotation of a Savonius turbine at low Reynolds numbers subject to Kolmogorov cascade of turbulence

英語

Vortex dynamics

2024-02-02

AIP Publishing

Physics of fluids

36(2)

027104

With an increasing demand for small energy generation in urban areas, small-scale Savonius wind turbines are growing their share rapidly. In such an environment, Savonius turbines are exposed to low mean velocity with highly turbulent flows made by complex geographies. Here, we report the flow-induced rotation of a Savonius turbine in a highly turbulent flow (18% turbulence intensity). The high turbulence is realized by using the far-field of an open-jet. Compared to low turbulence inflow (1% turbulence intensity), the turbine rotates 4% faster in high turbulence since the torque/power increases with turbulence intensity. The wake measurement by hot-wire anemometry and particle image velocimetry reveals the suppression of vortex shedding in high turbulence. In addition, a newly developed semi-empirical low-order model, which can include the effect of turbulence intensity and integral length scale, also confirms high turbulence intensity contributes to the rotation of the turbine. These results will boost more installation of small Savonius turbines in urban areas in the future.

学術雑誌論文

Version of Record

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Shūji Ōtomo, Yuji Tasaka, Petr Denissenko, Yuichi Murai; On the rotation of a Savonius turbine at low Reynolds numbers subject to Kolmogorov cascade of turbulence. Physics of Fluids 1 February 2024; 36 (2): 027104 and may be found at https://doi.org/10.1063/5.0180939.

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