Experimental investigation of a diffuser-integrated vertical axis wind turbine

Wang, X. H. and Wong, K. H. and Chong, Wen Tong and Ng, J. H. and Xiang, X. B. and Wang, C. T. (2020) Experimental investigation of a diffuser-integrated vertical axis wind turbine. In: International Conference on Sustainable Energy and Green Technology 2019, 11-14 December 2019, Bangkok, Thailand.

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The increase in energy demand and environmental pollution issues has led to the growth of utilizing renewable energy. Wind energy has become one of the main alternatives for power generation. In order to enhance the performance of the horizontal axis wind turbine (HAWT), the application of a diffuser is one of the innovative methods. At present, research on deploying the diffuser on the vertical axis wind turbine (VAWT) remains scarce. This paper presents the experimental study on the aerodynamic characteristics of a small H-rotor VAWT integrated with a diffuser. The diffuser comprises a pair of flat plates with an inclined angle of 30 degrees at the outlet, with the VAWT is located between the diffuser. A comparison between the turbine performance with and without the diffuser has been conducted. From the experiment, it shows that with the presence of the diffuser, the performance of the VAWT has increased significantly. The power obtained for the bare turbine and with the diffuser is 0.38 W and 0.48 W respectively which is increased by about 26.3% and occurring at 300 rpm. Moreover, with the diffuser, the incoming velocity is also increased. This is due to the presence of the diffuser which enables the flow expansion and creates a low-pressure region at the downwind; inducing a higher incoming wind flow to the VAWT and enhancing its performance. In addition, the rotational speed and a better self-start ability can be achieved with the presence of the diffuser.

Item Type: Conference or Workshop Item (Paper)
Funders: Ministry of Education (FP053-2017A), Universiti Malaya (IIRG011B-2019)
Additional Information: International Conference on Sustainable Energy and Green Technology (SEGT), Bangkok, Thailand, Dec 11-14, 2019
Uncontrolled Keywords: Vertical axis wind turbine; Diffuser; Experiment; Coefficient of power; Tip speed ratio
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering > Department of Mechanical Engineering
Depositing User: Ms Zaharah Ramly
Date Deposited: 12 Apr 2023 07:46
Last Modified: 12 Apr 2023 07:46
URI: http://eprints.um.edu.my/id/eprint/37200

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