Flow And Turbulence Characteristics Through A Vertical-Axis Wind Turbine Using Eddy Covariance Method

H’ng , Yin Mun (2016) Flow And Turbulence Characteristics Through A Vertical-Axis Wind Turbine Using Eddy Covariance Method. Masters thesis, Universiti Sains Malaysia.

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Abstract

Turbin angin berjenis paksi menegak (VAWT) dipercayai berkesan dalam keadaan kelajuan angin rendah. Objektif kajian ini adalah untuk menilai ciri-ciri pergolakan dan aliran di depan dan belakang VAWT berdasarkan kelajuan aliran yang berbeza, untuk menentukan profil sisi dan menegak bagi di depan dan belakang VAWT, dan untuk menentukan ciri-ciri spektrum pergolakan di aliran belakang VAWT dengan menggunakan kaedah “kovarians eddy” untuk menentukan ciri-ciri aliran dan pergolakan bagi VAWT. Kajian dijalankan di makmal tertutup untuk mengelakkan pembolehubah yang kompleks yang hadir dalam angin di luar. Tiga 26" kipas angin industri yang diatur sebaris boleh beroperasi pada kelajuan berlainan digunakan untuk menjana sumber aliran. Naik turun pergolakan dalam tiga dimensi diukur oleh satu ultrasonik anemometer pada 10 Hz untuk memastikan kebanyakan daripada skala pergolakan dirangkumi. Kajian awal menunjukkan siri masa halaju aliran adalah sama dengan keadaan pergolakan di luar. Vertical-axis wind turbine (VAWT) is claimed to be effective in low wind speed conditions. The objectives of this research are to assess the turbulence and flow characteristics of upwind and wake of a VAWT based on different flow speeds, to determine the lateral and vertical profiles of upwind and in the wake of a VAWT and to determine the spectral characteristics of turbulence in the wake of VAWT using the eddy covariance method. To characterize the flow and obtain direct measurements of turbulence of a VAWT, the experiment is conducted in a controlled indoor laboratory to avoid the complex nature of outdoor wind. The flow source was simulated by three 26" industrial standing fans arranged in a row at different speed settings. The three dimensional flow velocities fluctuations were measured by an ultrasonic anemometer at 10 Hz in order to cover most turbulence scales. A preliminary study showed that the time series of flow velocities were similar to the outdoor turbulence condition.

Item Type:	Thesis (Masters)
Subjects:	T Technology > T Technology (General) > T1-995 Technology(General)
Divisions:	Pusat Pengajian Teknologi Industri (School of Industrial Technology) > Thesis
Depositing User:	Mr Noorazilan Noordin
Date Deposited:	11 Jan 2017 00:58
Last Modified:	12 Apr 2019 05:25
URI:	http://eprints.usm.my/id/eprint/31529

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