High-speed videos of laboratory leaders emerging from wind turbine blade tips

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.

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Fracture Monitoring of Composite Wind Turbine Blade Using High-Speed Bragg Grating Sensor System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.109.79 ◽

2011 ◽

Vol 109 ◽

pp. 79-83 ◽

Cited By ~ 1

Author(s):

Hyung Joon Bang ◽

Soo Hyun Kim

Keyword(s):

Wind Turbine ◽

Turbine Blade ◽

High Speed ◽

Performance Test ◽

Turbine Blades ◽

Wind Turbine Blade ◽

Sensor System ◽

Bragg Grating ◽

Fbg Sensor ◽

Fbg Sensors

This paper introduces a FBG (fiber Bragg grating) based AE (acoustic emission) sensing system for use in health monitoring of composite wind turbine blades. In this study, a multiplexing high speed FBG sensor system was developed with a spectrometer-type demodulator based on a linear photo detector. Pencil break test was performed using an FBG sensor and the results were compared with the results of piezo-based AE sensor. For the performance test of fracture sensing in composite materials, a down-scaled wind turbine blade was fabricated and drop impact tests were performed. Arrayed 4 FBG sensors were installed in the skin of wind turbine blade and impacts of 15 J energy were applied by a drop weight. The frequency characteristics of impact induced AE signals were examined with short-time Fourier transform focused on the leading waves. Finally, the onset of fractures in composite structure was successfully assessed using arrayed FBG sensors.

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Detecting and Positioning of Wind Turbine Blade Tips for UAV-Based Automatic Inspection

IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium ◽

10.1109/igarss.2019.8899827 ◽

2019 ◽

Cited By ~ 1

Author(s):

Haowen Guo ◽

Qiangqiang Cui ◽

Jinwang Wang ◽

Xu Fang ◽

Wen Yang ◽

...

Keyword(s):

Wind Turbine ◽

Turbine Blade ◽

Wind Turbine Blade ◽

Automatic Inspection ◽

Blade Tips

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Design and Testing of a New Small Wind Turbine Blade

Journal of Solar Energy Engineering ◽

10.1115/1.4026464 ◽

2014 ◽

Vol 136 (3) ◽

Cited By ~ 10

Author(s):

Qiyue Song ◽

William David Lubitz

Keyword(s):

Wind Turbine ◽

Turbine Blade ◽

Pitch Angle ◽

High Speed ◽

Wind Turbine Blade ◽

Horizontal Axis Wind Turbine ◽

Small Wind Turbine ◽

High Winds ◽

Design And Testing ◽

Blade Pitch Angle

A small wind turbine blade was designed using blade element momentum (BEM) method for a three bladed, fixed pitch 1 kW horizontal axis wind turbine. The new blades were fabricated, fit to a Bergey XL 1.0 turbine, and tested using a vehicle-based platform at the original designed pitch angle, plus with 5 deg and 9 deg of additional pitch. The new blades had better aerodynamic performance than the original Bergey XL 1.0 blades at high speed, but in some cases at lower speeds the original blades performed better. The results demonstrated that selecting the blade pitch angle on a rotor is a tradeoff between starting performance and power output in high winds. The BEM simulations were evaluated against the test data and demonstrated that the BEM simulations predicted the rotor performance with reasonable accuracy.

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