Power Output Enhancement of a Ducted Wind Turbine by Stabilizing Vortices around the Duct

Abstract

A brimmed-diffuser augmented turbine (called a wind lens turbine: WLT) actively uses vortices around the brim to enhance its power output. However, the vortices are usually unstable and asymmetric. This study attempted to stabilize the vortices to enhance the power output of a WLT. Then, we investigated new approaches using vortex stabilization plates and polygonal brims in wind tunnel experiments and numerical simulations. Both approaches achieved a 1.5–3.8% increase in power output compared with a standard WLT. Our numerical simulations revealed a periodicity existing in a fluctuating vortex structure on the circular brim. Importantly, vortex stabilization plates and polygonal brims must be the same periodic scale to suppress the vortex fluctuation and stabilize the vortices effectively. In addition, a larger brim tended to enhance the stabilizing effects. We believe that this discovery provides an easy way to increase the power output of existing wind turbines. It is particularly important in light of advances in wind energy technology and the increasing wind energy market.

An Ignored Wind Generates More Electricity: A Solar Updraft Tower to a Wind Solar Tower

“…The suitability of the diffuser-shaped tower was already verified in our previous study using thermal updraft [14]. We have applied the similar mechanism in our brimmed-diffuser augmented wind turbines and achieved large output power increase [15][16][17]. Importantly, the new approach enabled the solar updraft tower to utilize two different renewable energies simultaneously, although such a hybrid approach is usually achieved by several devices in the same location [18,19].…”

Studi Performance Turbin Angin Aksial Kecepatan Rendah 3 Blade Dengan Profil Airfoil Naca 6 Digit

“…Konstruksi blade untuk mendapatkan performa yang optimal dari sebuah turbin angin tergantung pada bentuk aerodinamisnya [14] dengan jumlah blade ideal dengan pembagian gaya dan keseimbangan yang baik adalah 3 blade [15] serta penggunaan ducted pada turbin yang dapat meningkatkan koefesien daya sampai 72% [16][3] [17].…”

Principales túneles de viento en la investigación sobre energía eólica alrededor del mundo

“…Este túnel de capa límite de 264 kW y con 3.6 m de ancho, 2 m de alto y 15 m de largo en la zona de pruebas (en la figura 4 se muestran más características) se ha utilizado en diversas investigaciones enfocadas en los concentradores de flujo tipo Wind Lens. En [51] se utilizaron álabes estabilizadores de vórtices y diferentes geometrías de borde en una WLT (Wind Lens turbine), con el objetivo de aumentar la potencia de la turbina. Al utilizar 6 álabes y un Wind Lens del tipo Ci10 (borde circular), se aumentó la potencia en 3.8%, por otra parte, al utilizar un lente dodecagonal y sin álabes estabilizadores, se aumentó la potencia en 1.5%.…”