Abstract
Flow control device modeling is an engaging research field for wind turbine optimization, since in recent years wind turbines have grown in proportions and weight. The purpose of the present work was to study the performance and effects generated by a rotating microtab (MT) implemented on the trailing edge of a DU91W250 airfoil through the novel cell-set (CS) model for the first time via CFD techniques. The CS method is based on the reutilization of an already calculated mesh for the addition of new geometries on it. To accomplish that objective, the required region is split from the main domain, and new boundaries are assigned to the mentioned construction. Three different MT lengths were considered: h = 1%, 1.5% and 2% of the airfoil chord length, as well as seven MT orientations (β): from 0° to −90° regarding the horizontal axis, for five angles of attack: 0°, 2°, 4°, 6° and 9°. The numerical results showed that the increases of the β rotating angle and the MT length (h) led to higher aerodynamic performance of the airfoil, CL/CD = 164.10 being the maximum ratio obtained. All the performance curves showed an asymptotic trend as the β angle reduced. Qualitatively, the model behaved as expected, proving the relationship between velocity and pressure. Taking into consideration resulting data, the cell-set method is appropriate for computational testing of trailing edge rotating microtab geometry.
Highlights
Wind energy has become a key source of electricity generation in the pursuit of a clean and sustainable energy model [1]
This section is divided three different subsections: the aerodynamic performance for all the cases is outlined, wherein the influence of angle of attack performance for all the cases is outlined, wherein the influence of the angle the of attack the length and orientation of the are taken into consideration
The pressure distribution along distrib along theisDU91W250 airfoil is explained for different orientations of the tab
Summary
Wind energy has become a key source of electricity generation in the pursuit of a clean and sustainable energy model [1]. Improvement of wind turbines is currently required in order to compete in energy production and cost against traditional energies. Active and passive flow control devices have been introduced in wind turbine blades with the intention of enhancing or optimizing their performance. Aramendia-Iradi et al [2] comprehensively reviewed the available active and passive flow control devices for wind turbine blades, while González-Salcedo et al [3] only studied the passive flow control devices. There are many experimental studies on wind turbines and their flow control devices. Soto-Valle et al [4] experimentally studied the effect of adding different shaped vortex generators (VGs) to an airfoil. Bach et al [5]
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