Wind tunnel test to investigate transition to turbulence on wind turbine airfoil

The choice of the airfoils with excellent aerodynamics characteristics is an essential step in the design of wind turbine blade in order to obtain optimal performances. Wind tunnel test to investigate transition to turbulence on wind turbine airfoil was performed in the Universiti Teknologi Malaysia...

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Main Author:	Namin, Mahdi Hozhabri
Format:	Thesis
Language:	English
Published:	2014
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/50813/25/MahdiHozhabriNaminMFKM2014.pdf
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id	my-utm-ep.50813
record_format	uketd_dc
spelling	my-utm-ep.508132020-07-12T07:04:12Z Wind tunnel test to investigate transition to turbulence on wind turbine airfoil 2014-07 Namin, Mahdi Hozhabri TJ Mechanical engineering and machinery The choice of the airfoils with excellent aerodynamics characteristics is an essential step in the design of wind turbine blade in order to obtain optimal performances. Wind tunnel test to investigate transition to turbulence on wind turbine airfoil was performed in the Universiti Teknologi Malaysia Low Speed Tunnel. Aerodynamic characteristics of a NACA 64(4)-421 airfoil in a two-dimensional setup, such as lift, drag and pressure coefficients were measured for two main cases. In the first case, tests were carried out on a clean airfoil (no turbulator) and in the second case, three configurations with three different positions of turbulator at x=10%, 20% and 50% of chord were tested. A Steady-state, two-dimensional CFD calculations were also carried out for the airfoil in same scale as experimental test using commercial CFD code, Ansys FLUENT 14. The surface coordinates of the experimental airfoil model were measured by coordinate measurement machine (CMM) and optimized in ICEM CFD software included in the Ansys package to create the related geometry and mesh. All experimental and numerical analysis were performed at velocities of V=22, 33, 45, 56, 61 m/s and at angle of attacks ranges between -6? to +30?. For the simulation, a minimum of 85000 grids was used to get a grid independent solution. To simulate the transition phenomena, K-?-SST turbulent model was used. Different types of mesh were analyzed in detail by comparing agreement between the simulated aerodynamic characteristics with experimental results. There are good agreement between experimental results and numerical results by using K-?-SST model. Both lift coefficient and pressure coefficient in experimental and numerical studies have good agreement with each other but it is not true for drag coefficients. Also according to different meshes, we found that a mesh with unit zone which contains K-?-SST model is the best model according to the convergence speed and accuracy. The effects of turbulator used in the experiment was not significant. In conclusion the study is partly successful. 2014-07 Thesis http://eprints.utm.my/id/eprint/50813/ http://eprints.utm.my/id/eprint/50813/25/MahdiHozhabriNaminMFKM2014.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:86793 masters Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Namin, Mahdi Hozhabri Wind tunnel test to investigate transition to turbulence on wind turbine airfoil
description	The choice of the airfoils with excellent aerodynamics characteristics is an essential step in the design of wind turbine blade in order to obtain optimal performances. Wind tunnel test to investigate transition to turbulence on wind turbine airfoil was performed in the Universiti Teknologi Malaysia Low Speed Tunnel. Aerodynamic characteristics of a NACA 64(4)-421 airfoil in a two-dimensional setup, such as lift, drag and pressure coefficients were measured for two main cases. In the first case, tests were carried out on a clean airfoil (no turbulator) and in the second case, three configurations with three different positions of turbulator at x=10%, 20% and 50% of chord were tested. A Steady-state, two-dimensional CFD calculations were also carried out for the airfoil in same scale as experimental test using commercial CFD code, Ansys FLUENT 14. The surface coordinates of the experimental airfoil model were measured by coordinate measurement machine (CMM) and optimized in ICEM CFD software included in the Ansys package to create the related geometry and mesh. All experimental and numerical analysis were performed at velocities of V=22, 33, 45, 56, 61 m/s and at angle of attacks ranges between -6? to +30?. For the simulation, a minimum of 85000 grids was used to get a grid independent solution. To simulate the transition phenomena, K-?-SST turbulent model was used. Different types of mesh were analyzed in detail by comparing agreement between the simulated aerodynamic characteristics with experimental results. There are good agreement between experimental results and numerical results by using K-?-SST model. Both lift coefficient and pressure coefficient in experimental and numerical studies have good agreement with each other but it is not true for drag coefficients. Also according to different meshes, we found that a mesh with unit zone which contains K-?-SST model is the best model according to the convergence speed and accuracy. The effects of turbulator used in the experiment was not significant. In conclusion the study is partly successful.
format	Thesis
qualification_level	Master's degree
author	Namin, Mahdi Hozhabri
author_facet	Namin, Mahdi Hozhabri
author_sort	Namin, Mahdi Hozhabri
title	Wind tunnel test to investigate transition to turbulence on wind turbine airfoil
title_short	Wind tunnel test to investigate transition to turbulence on wind turbine airfoil
title_full	Wind tunnel test to investigate transition to turbulence on wind turbine airfoil
title_fullStr	Wind tunnel test to investigate transition to turbulence on wind turbine airfoil
title_full_unstemmed	Wind tunnel test to investigate transition to turbulence on wind turbine airfoil
title_sort	wind tunnel test to investigate transition to turbulence on wind turbine airfoil
granting_institution	Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department	Faculty of Mechanical Engineering
publishDate	2014
url	http://eprints.utm.my/id/eprint/50813/25/MahdiHozhabriNaminMFKM2014.pdf
_version_	1747817540043669504

Wind tunnel test to investigate transition to turbulence on wind turbine airfoil

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