Flow Field Assessment In A Vertical Axis
Wind Turbine
Author(s)
R. Ricci, S. Montelpare, A. Secchiaroli & V. D’Alessandro
Abstract
In this work, flow field features in a vertical axis Savonius wind rotor were
investigated by means of a specially developed CFD method validated using
wind tunnel testing data.
The Savonius rotor exhibits a strong variation of its angular velocity during
the rotation. The solution of the second cardinal equation of dynamics is then
needed to obtain a high-fidelity physical modelling of the device and an accurate
performance prediction.
The proposed methodology is based on the integration between a commercial
CFD code and custom MatLab routines. The former is used for the flow field
computations, while the latter are used for the time integration of the second
cardinal equation of dynamics. Unsteady RANS equations closed with the v2-f
turbulence model were solved to consider the turbulent flow behaviour.
This procedure allows one to numerically evaluate the dimensionless
parameters used in the performance characterization of wind turbines. Moreover,
the flow field around the rotor can be evaluated, at every solved angular position
(with respect to the incoming wind direction), taking into account the effect of
the angular velocity variations of the rotor. An extended wind tunnel testing
campaign was conducted on a rotor model in order to validate the computational
procedure. A very good agreement between experimental and numerical data can
be observed.
The main features of the flow field at different operating points of the rotor
are presented in this paper. An evaluation of the characteristic of the wake
behind the rotor obtained by means of a spectral analysis of the velocity
magnitude signal is reported too.
Keywords: computational fluid-dynamics, Savonius wind rotor, wind energy.
Keywords
computational fluid-dynamics, Savonius wind rotor, wind energy
Related Book
Other papers in this volume
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