Abstract
The research on three dimensional (3-D) wind turbine blades has been introduced (Sutrisno, Prajitno, Purnomo, & B.W. Setyawan, 2016). In the current experiment, the 3-D wind turbine blades would be fitted with helicopter-like blade tips and additional fins to the blade hubs to demonstrate some laminarizing features. It was found that additional helicopter-like blade tip to the turbine blade creates strong laminar flows over the surface of the blade tips. Supplementary, finned hub, fitted to the blade body, creates rolled-up vortex flows, weakens the blade stall growth development, especially for blades at high-speed wind. A proposed mathematical form of modified lifting line model has been developed to pursue further 3-d blade development study of 3-d wind turbine blade. Rolled up vortex effects, developed by finned of the base hub, has been acknowledged could demolish the turbulent region, as well as laminarize the stall domain to intensify the induced wind turbine blade lift.
Highlights
Since the early research development of the wind turbine rotor theory, the wind turbine blade was divided into a number of independent spanwise sections and the induced velocities could be calculated
The purpose of this study is to investigate the performance of combination between the hub and the tip of 3-D wind turbine blade plate models with finned hub and helicopter-like propeller blade tips, introduced as ”UGM 3-D blade type 2”
The blades are backward (BW) and forward (FW), either with regular hub (HR) or finned hub (HF) and, depending on the choice of helicopter-like blade tip, the tip is mounted with BERP IV or BERP III or SwTT when using swept taper tip, or JpKd when using the Japan AT1 blade tips
Summary
Since the early research development of the wind turbine rotor theory, the wind turbine blade was divided into a number of independent spanwise sections and the induced velocities could be calculated. This method for infinitely many blades was called the blade element momentum (BEM) theory. Computational fluid dynamic (CFD) investigations have been conducted at different wind speeds from 5 m/s to 9 m/s showing the flow characteristics and the stall delay phenomenon of wind turbine rotor due to blade rotation (Yu, Shen, Zhu, & Du, 2011)
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