Modeling Strategy and Numerical Validation for a Darrieus Vertical Axis Micro-Wind Turbine

Author:

Raciti Castelli Marco1,Ardizzon Guido1,Battisti Lorenzo2,Benini Ernesto1,Pavesi Giorgio1

Affiliation:

1. University of Padova, Padova, Italy

2. University of Trento, Trento, Italy

Abstract

This paper presents a model for the evaluation of optimal spatial grid node distribution in the CFD analysis of a Darrieus vertical axis micro wind turbine, by analyzing the trends over a 360° rotation of some indicators of near-blade mesh quality. To this purpose, a complete validation campaign has been conducted through a systematic comparison of numerical simulations with wind tunnel experimental data. Both two-dimensional and three-dimensional grids, characterized by average y+ values of 30 and 1, have been tested by applying some statistical techniques as a guidance in selecting the appropriate grid configuration and corresponding turbulence model. Finally, the tip downstream recirculation zone due to the finite blade extension and the influence of spokes have been analyzed, achieving a numerical quantification of the influence of induced drag and spokes drag on overall rotor performance.

Publisher

ASMEDC

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