Coupled Dynamics of a Flexible Horizontal Axis Wind Turbine With Damaged Blades: Experimental and Numerical Validations

2017 ◽  
Vol 140 (2) ◽  
Author(s):  
M. A. Ben Hassena ◽  
F. Najar ◽  
S. Choura ◽  
F. H. Ghorbel
Keyword(s):  
Wind Turbine ◽  
Modal Analysis ◽  
Fem Analysis ◽  
Element Model ◽  
Horizontal Axis ◽  
Experimental Investigations ◽  
Horizontal Axis Wind Turbine ◽  
State Response ◽  
Proposed Model ◽  
Additional Point

In this paper, we propose a new coupled dynamical model of a horizontal axis wind turbine (HAWT). The proposed model takes into consideration the dynamic coupling of the flexible tower with both bending and torsion of the flexible blades. This model also accounts for the dynamics of an additional point mass located in one of the blades to simulate a crack. In addition, a finite element model (FEM) analysis along with an experimental study is conducted in this research to validate the modal analysis of a HAWT prototype. Data from the analytical, numerical, and experimental investigations were collected and showed comparable findings. Using the analytical model, the modal analysis and the steady-state response of the HAWT prototype are performed for two configurations: with and without a crack. In this paper, we also propose a new model-based technique for the detection of cracks in the HAWT.

scholarly journals Experimental investigations of winglet effects on blade geometry of small horizontal axis wind turbine rotors

2021 ◽  
Author(s):  
Manoj Kumar Chaudhary ◽  
◽  
S. Prakash ◽  
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Lift Coefficient ◽  
Research Work ◽  
Operating Conditions ◽  
Horizontal Axis ◽  
Power Coefficient ◽  
Experimental Investigations ◽  
Horizontal Axis Wind Turbine ◽  
Blade Geometry

In this research work, the investigation and optimization of small horizontal axis wind turbine blade at low wind speed is pursued. The experimental blades were developed using the 3D printing additive manufacturing technique. The airfoils E210, NACA2412, S1223, SG6043, E216, NACA4415, SD7080, SD7033, S1210 and MAF were tested at the wind speed of 2-6 m/s. The airfoils and optimum blade geometry were investigated with the aid of the Xfoil software at Reynolds number of 100,000. The initial investigation range included tip speed ratios from 3 to 10, solidity from 0.0431 – 0.1181 and angle of attacks from 2o to 20o. Later on these parameters were varied in MATLAB and Xfoil software for optimization and investigation of the power coefficient, lift coefficient, drag coefficient and lift to drag ratio. The cut-in wind speed of the rotors was 2 and 2.5 m/s with the winglet-equipped blades and without winglets. It was found that the E210, SG6043, E216 NACA4415 and MAF airfoil displayed better performance than the NACA 2412, S1223, SD7080, S1210 & SD7003 for the geometry optimized for the operating conditions and manufacturing method described.

Modal Analysis of the 1.5MW Wind Turbine Tower

2013 ◽  
Vol 712-715 ◽  
pp. 1494-1500
Author(s):  
Bi Feng Cao ◽  
Hui Yu
Keyword(s):  
Finite Element ◽  
Wind Turbine ◽  
Modal Analysis ◽  
Natural Frequency ◽  
Excitation Frequency ◽  
Horizontal Axis ◽  
Horizontal Axis Wind Turbine ◽  
Finite Element Software ◽  
Wind Turbine Tower ◽  
Tower Model

The paper uses the finite element software ANSYS to establish a 1.5 MW horizontal-axis wind turbine tower model as an example and works on the modal analysis. The modal analysis takes into account the totalmass of wind rotor and nacelle and assumes the bottom of the wind turbine tower is fully constrained. The result shows that the natural frequency of the 1.5MW wind turbine tower is not coincident with the excitation frequency of the wind turbine, and the wind turbine can operate stably at the design condition.

Experimental investigations of airfoil surface flow of a horizontal axis wind turbine with LDV measurements

Energy ◽  
2020 ◽  
Vol 191 ◽  
pp. 116558
Author(s):  
Qing’an Li ◽  
Jianzhong Xu ◽  
Yasunari Kamada ◽  
Maeda Takao ◽  
Shogo Nishimura ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Surface Flow ◽  
Horizontal Axis ◽  
Experimental Investigations ◽  
Horizontal Axis Wind Turbine ◽  
Airfoil Surface

Study on Tower Vibration Characteristic of 3-Rotor HAWT System

2015 ◽  
Vol 724 ◽  
pp. 230-237
Author(s):  
Lin Ping Lu ◽  
Yi Ping Wang ◽  
Qun Wu Huang
Keyword(s):  
Wind Turbine ◽  
Maximum Stress ◽  
Element Model ◽  
Horizontal Axis ◽  
Vibration Characteristic ◽  
Analysis Method ◽  
Horizontal Axis Wind Turbine ◽  
Horizontal Axis Wind Turbines ◽  
Tower Vibration ◽  
The Finite Element Model

Multi-Rotor Horizontal Axis Wind Turbine (MR-HAWT) system with three 2kW Horizontal Axis Wind Turbines (HAWTs) is the research object. After some appropriate simplifications, the finite element model is established and verified by experiments. The vibration characteristic of the tower under rotors’ periodic excitations is studied through transient analysis method and compared with 6kW single-rotor HAWT system. The result shows that the maximum stress of the 3-Rotor Horizontal Axis Wind Turbine (3R-HAWT) system is less than the single-rotor HAWT, so the safety of the 3R-HAWT system is superior to the single-rotor HAWT system.

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