Structural Performance and Power Production of Wind Turbine Systems with Bend-Twist Coupled Blades in Underrated Wind Conditions

Date

2018-01-12

Author

Şener, Özgün
Kayran, Altan

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

190
views

0
downloads

The implementation of bend-twist coupling effect on wind turbine blades on the structural performance and power production of wind turbine system exposed to underrated wind conditions are studied. The structural performance of wind turbine systems are evaluated by the decrease in damage equivalent loads in the whole wind turbine system and reduction in maximum fiber direction stresses in the blades with the exploitation of off-axis plies in the main spar caps of the wind turbine blades. Wind turbine models with designed GFRP bend-twist coupled blades are generated in a multi-body code which uses a superelement blade definition. 325-second transient aeroelastic analyses of wind turbine systems are performed for different constant wind definitions for power production evaluation, and structural performance is assessed based on the damage equivalent load reductions in the whole wind turbine system that is exposed to turbulent wind profiles for six-hundred seconds as stated in IEC standards, and lessening in fiber direction stresses in the blades. Results show that for underrated, rated, and overrated average hub height wind speeds, bend-twist coupled blades ensure considerable reductions in the loads at the cost of slight reduction in generated power in underrated wind speeds.

URI

https://hdl.handle.net/11511/41448

DOI

https://doi.org/10.2514/6.2018-1242

Collections

Department of Aerospace Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Classical Aeroelastic Stability Analysis of Large Composite Wind Turbine Blades Farsadi, Touraj; Kayran, Altan (2016-01-04) To achieve higher energy production bigger wind turbine systems with very long blades are increasingly used in the wind turbine industry. As the length of the wind turbine blades is increased, blades become more flexible in bending and torsion. Increased bending and torsional flexibility of long wind turbine blades may cause torsional divergence and flapwise bending-torsion flutter at high speeds. Therefore, it is important that aeroelastic stability characteristics of the blades be investigated to ensure t...
Aerodynamic shape optimization of wind turbine blades for minimizing power production losses due to icing Yirtici, Ozcan; Tuncer, İsmail Hakkı (2021-05-01) Ice formation on a wind turbine alters the airfoil profiles of the blades and causes degradation in the aerodynamic performance of the wind turbine and the resulting power production losses. Since the blade profile plays a significant role in the icing of a blade, power production losses due to icing can be minimized by optimizing the blade profile against icing. In this study, blade profiles are optimized in order to minimize power production losses. A Gradient based aerodynamic shape optimization method i...
Delamination-Debond Behaviour of Composite T-Joints in Wind Turbine Blades Gulasik, H.; Çöker, Demirkan (2014-06-20) Wind turbine industry utilizes composite materials in turbine blade structural designs because of their high strength/stiffness to weight ratio. T-joint is one of the design configurations of composite wind turbine blades. T-joints consist of a skin panel and a stiffener co-bonded or co-cured together with a filler material between them. T-joints are prone to delaminations between skin/stiffener plies and debonds between skin-stiffener-filler interfaces. In this study, delamination/debond behavior of a co-b...
Design and Analysis of Shrouded Small-Scale Wind Turbine for Low Wind Speeds Yildiz, R. Erdem; Ekinci, Abdurrahman (2018-06-22) This work presents design and analysis of a shrouded small scale wind turbine optimized for extremely low wind speeds. In-house FORTRAN code based on Glauert's method are used for preliminary design. QBlade and CFD are used for iterative optimization. Results show that power output can be increased 1.5-2.5 times by using shroud. Additionally, using shroud and optimizing for low wind speed solves starting problem that small scale wind turbines have considerably and increases sustainability of power production.
Performance Study of Wind Turbines with Bend-Twist Coupled Blades at Underrated Wind Speeds Atalay, Oğuz; Farsadi, Touraj; Kayran, Altan (2017-09-22) Use of bend-twist coupled blades is one of the ways to alleviate fatigue loads in wind turbine systems. Load reduction is achieved by placing off-axis layers in the spar caps of composite wind turbine blades. Off-axis layers provide twisting of the blade in the feathering direction thereby decreasing the aerodynamic loads due to the reduced effective angle of attack. Reduction of fatigue loads in the wind turbine system is generally measured by the damage equivalent load. In the present study, performance o...

Citation Formats

Ö. Şener and A. Kayran, “Structural Performance and Power Production of Wind Turbine Systems with Bend-Twist Coupled Blades in Underrated Wind Conditions,” 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/41448.