Figure 5. Reduced frequencies against the tip-speed ratios at several chord to radios ratios

From

Numerical Modelling of an H-type Darrieus Wind Turbine Performance under Turbulent Wind

Ahmed Ahmedov, K. M. Ebrahimi

American Journal of Energy Research. 2017, 5(3), 63-78 doi:10.12691/ajer-5-3-1