Experimental and simulation study of a diffuser augmented wind turbine to enhance the performance by modifying diffuser and rotor

Wind energy technology represented in wind turbines is one of the fastest growing alternative energy technologies, especially horizontal axis wind turbine (HAWT) type which is more efficient, compared to other conventional wind turbines. However, it is less utilized in urban areas due to the relativ...

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Main Author:	Jabbar, Balasem Abdulameer
Format:	Thesis
Language:	English English English
Published:	2019
Subjects:	TJ266-267.5 Turbines Turbomachines (General)
Online Access:	http://eprints.uthm.edu.my/5/1/BALASEM%20ABDULAMEER%20JABBAR%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/5/2/24p%20BALASEM%20ABDULAMEER%20JABBAR.pdf http://eprints.uthm.edu.my/5/3/BALASEM%20ABDULAMEER%20JABBAR%20WATERMARK.pdf
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spelling	my-uthm-ep.52021-06-06T07:28:26Z Experimental and simulation study of a diffuser augmented wind turbine to enhance the performance by modifying diffuser and rotor 2019-11 Jabbar, Balasem Abdulameer TJ266-267.5 Turbines. Turbomachines (General) Wind energy technology represented in wind turbines is one of the fastest growing alternative energy technologies, especially horizontal axis wind turbine (HAWT) type which is more efficient, compared to other conventional wind turbines. However, it is less utilized in urban areas due to the relatively low wind velocity in these areas. In the this work, a technique of augmenting wind by the concept of diffuser augmented wind turbine (DAWT) has been presented to improve the efficiency of small scale of HAWT by enclosing it with a suitable diffuser. The study included two stages for performance improvement; first, developing the diffuser design in three configurations, and second, developing the design of HAWT rotor blades based on the maximum increase of wind velocity in the modified diffuser; at the rotor position, a Modified Theory was used. Two models of DAWT were obtained; one of them was installed with the preliminary rotor, while the other one was installed with the modified rotor where aerodynamic performance predictions of the diffuser, bare HAWT, and DAWTs models have been studied through experimental and simulation approaches. The simulation study was performed using 3-D CFD models based on the SST k-ω turbulence model using ANSYS 19.1, while the experimental study was conducted in an open-loop wind tunnel. The performance evaluations of the models were established in terms of power, torque and aerodynamics coefficient which were power coefficient and torque coefficient. The systematic analysis of these quantities showed that DAWT with a flanged diffuser achieved a significant increase in performance compared to bare HAWT. The results also demonstrated that DAWT with flange angle of 0˚, at both rotors models, achieved the best augmented in power, compared to other flange configurations. On the other hand, the average power was augmented in the DAWT at 0˚flange angle (ϴf) with the preliminary rotor (FDAWT-PR) by around 256%, compared to bare HAWT, while the augmentation reached up to 291% in DAWT with the modified rotor (FDAWT-MR) at same flange angle. In addition, FDAWT (ϴf =0˚)-MR has a simple shape, economic, and compact size. Furthermore, the simulation was conducted to visualize the fluid flowing around the chosen models, as well as giving precise details that difficult to obtaining them practically. 2019-11 Thesis http://eprints.uthm.edu.my/5/ http://eprints.uthm.edu.my/5/1/BALASEM%20ABDULAMEER%20JABBAR%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/5/2/24p%20BALASEM%20ABDULAMEER%20JABBAR.pdf text en public http://eprints.uthm.edu.my/5/3/BALASEM%20ABDULAMEER%20JABBAR%20WATERMARK.pdf text en validuser phd doctoral Universiti Tun Hussein Onn Malaysia Fakulti Kejuruteraan Mekanikal dan Pembuatan
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	TJ266-267.5 Turbines Turbomachines (General)
spellingShingle	TJ266-267.5 Turbines Turbomachines (General) Jabbar, Balasem Abdulameer Experimental and simulation study of a diffuser augmented wind turbine to enhance the performance by modifying diffuser and rotor
description	Wind energy technology represented in wind turbines is one of the fastest growing alternative energy technologies, especially horizontal axis wind turbine (HAWT) type which is more efficient, compared to other conventional wind turbines. However, it is less utilized in urban areas due to the relatively low wind velocity in these areas. In the this work, a technique of augmenting wind by the concept of diffuser augmented wind turbine (DAWT) has been presented to improve the efficiency of small scale of HAWT by enclosing it with a suitable diffuser. The study included two stages for performance improvement; first, developing the diffuser design in three configurations, and second, developing the design of HAWT rotor blades based on the maximum increase of wind velocity in the modified diffuser; at the rotor position, a Modified Theory was used. Two models of DAWT were obtained; one of them was installed with the preliminary rotor, while the other one was installed with the modified rotor where aerodynamic performance predictions of the diffuser, bare HAWT, and DAWTs models have been studied through experimental and simulation approaches. The simulation study was performed using 3-D CFD models based on the SST k-ω turbulence model using ANSYS 19.1, while the experimental study was conducted in an open-loop wind tunnel. The performance evaluations of the models were established in terms of power, torque and aerodynamics coefficient which were power coefficient and torque coefficient. The systematic analysis of these quantities showed that DAWT with a flanged diffuser achieved a significant increase in performance compared to bare HAWT. The results also demonstrated that DAWT with flange angle of 0˚, at both rotors models, achieved the best augmented in power, compared to other flange configurations. On the other hand, the average power was augmented in the DAWT at 0˚flange angle (ϴf) with the preliminary rotor (FDAWT-PR) by around 256%, compared to bare HAWT, while the augmentation reached up to 291% in DAWT with the modified rotor (FDAWT-MR) at same flange angle. In addition, FDAWT (ϴf =0˚)-MR has a simple shape, economic, and compact size. Furthermore, the simulation was conducted to visualize the fluid flowing around the chosen models, as well as giving precise details that difficult to obtaining them practically.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Jabbar, Balasem Abdulameer
author_facet	Jabbar, Balasem Abdulameer
author_sort	Jabbar, Balasem Abdulameer
title	Experimental and simulation study of a diffuser augmented wind turbine to enhance the performance by modifying diffuser and rotor
title_short	Experimental and simulation study of a diffuser augmented wind turbine to enhance the performance by modifying diffuser and rotor
title_full	Experimental and simulation study of a diffuser augmented wind turbine to enhance the performance by modifying diffuser and rotor
title_fullStr	Experimental and simulation study of a diffuser augmented wind turbine to enhance the performance by modifying diffuser and rotor
title_full_unstemmed	Experimental and simulation study of a diffuser augmented wind turbine to enhance the performance by modifying diffuser and rotor
title_sort	experimental and simulation study of a diffuser augmented wind turbine to enhance the performance by modifying diffuser and rotor
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Fakulti Kejuruteraan Mekanikal dan Pembuatan
publishDate	2019
url	http://eprints.uthm.edu.my/5/1/BALASEM%20ABDULAMEER%20JABBAR%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/5/2/24p%20BALASEM%20ABDULAMEER%20JABBAR.pdf http://eprints.uthm.edu.my/5/3/BALASEM%20ABDULAMEER%20JABBAR%20WATERMARK.pdf
_version_	1747830519173742592

Experimental and simulation study of a diffuser augmented wind turbine to enhance the performance by modifying diffuser and rotor

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