Vertical axis current turbine using arm and self-adjusting blade angle for low speed current

Utilization of electrical energy is important for economic growth and improvement of people's living, especially for rural and remote areas which have access to the water but lack of electricity supply. It is known that global energy, especially in developing countries such as Malaysia, is stil...

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Main Author:	Behrouzi, Fatemeh
Format:	Thesis
Language:	English
Published:	2017
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/79112/1/FatemehBehrouziPFKM2017.pdf
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id	my-utm-ep.79112
record_format	uketd_dc
spelling	my-utm-ep.791122018-09-30T08:17:21Z Vertical axis current turbine using arm and self-adjusting blade angle for low speed current 2017 Behrouzi, Fatemeh TJ Mechanical engineering and machinery Utilization of electrical energy is important for economic growth and improvement of people's living, especially for rural and remote areas which have access to the water but lack of electricity supply. It is known that global energy, especially in developing countries such as Malaysia, is still heavily dependent on fossil fuels, which are costly, cause environmental pollution and rapidly depleting. Hydrokinetic energy, which is one of green and environmentally friendly energy resources, is promising to replace fossil fuels for electricity generation. The objectives of this research are firstly to investigate the effect of arm on torque coefficient of turbine in low speed current, and secondly to determine the effect of self-adjusting blades on power coefficient. Numerical and experimental research methodologies have been applied to achieve the objectives. RANS equations have been applied in CFD simulations using ANSYS-CFX commercial code. For validation of the simulation results, towing tank experiments using fixed blades condition to obtain suitable arm length have been carried out at the Marine Technology Centre (MTC)- Universiti Teknologi Malaysia (UTM). Based on the results obtained by fixed blades condition, a series of test using self-adjusting blades have been done in three conditions of load at different current speeds to determine the performance of turbine. The results show that the arm length and blades angle have a strong effect on the performance of turbine, where there is 23% increase in terms of performance of selfadjusting blades turbine compared to fixed blades turbine. This is because the returning blade angle is in closed position which decreases the hydrodynamic resistance. In addition, the advancing blade angle is in open condition to have the maximum force acting. The combined effects result in the increase of torque by the turbine. The maximum efficiency of the modified self-adjusting system was 16% at tip speed ratio, λ=0.45. The developed turbine can be applied as a useful tool for electricity generation in low speed currents. It could also be integrated with a wide range of generators with different loads. 2017 Thesis http://eprints.utm.my/id/eprint/79112/ http://eprints.utm.my/id/eprint/79112/1/FatemehBehrouziPFKM2017.pdf application/pdf en public phd doctoral 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 Behrouzi, Fatemeh Vertical axis current turbine using arm and self-adjusting blade angle for low speed current
description	Utilization of electrical energy is important for economic growth and improvement of people's living, especially for rural and remote areas which have access to the water but lack of electricity supply. It is known that global energy, especially in developing countries such as Malaysia, is still heavily dependent on fossil fuels, which are costly, cause environmental pollution and rapidly depleting. Hydrokinetic energy, which is one of green and environmentally friendly energy resources, is promising to replace fossil fuels for electricity generation. The objectives of this research are firstly to investigate the effect of arm on torque coefficient of turbine in low speed current, and secondly to determine the effect of self-adjusting blades on power coefficient. Numerical and experimental research methodologies have been applied to achieve the objectives. RANS equations have been applied in CFD simulations using ANSYS-CFX commercial code. For validation of the simulation results, towing tank experiments using fixed blades condition to obtain suitable arm length have been carried out at the Marine Technology Centre (MTC)- Universiti Teknologi Malaysia (UTM). Based on the results obtained by fixed blades condition, a series of test using self-adjusting blades have been done in three conditions of load at different current speeds to determine the performance of turbine. The results show that the arm length and blades angle have a strong effect on the performance of turbine, where there is 23% increase in terms of performance of selfadjusting blades turbine compared to fixed blades turbine. This is because the returning blade angle is in closed position which decreases the hydrodynamic resistance. In addition, the advancing blade angle is in open condition to have the maximum force acting. The combined effects result in the increase of torque by the turbine. The maximum efficiency of the modified self-adjusting system was 16% at tip speed ratio, λ=0.45. The developed turbine can be applied as a useful tool for electricity generation in low speed currents. It could also be integrated with a wide range of generators with different loads.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Behrouzi, Fatemeh
author_facet	Behrouzi, Fatemeh
author_sort	Behrouzi, Fatemeh
title	Vertical axis current turbine using arm and self-adjusting blade angle for low speed current
title_short	Vertical axis current turbine using arm and self-adjusting blade angle for low speed current
title_full	Vertical axis current turbine using arm and self-adjusting blade angle for low speed current
title_fullStr	Vertical axis current turbine using arm and self-adjusting blade angle for low speed current
title_full_unstemmed	Vertical axis current turbine using arm and self-adjusting blade angle for low speed current
title_sort	vertical axis current turbine using arm and self-adjusting blade angle for low speed current
granting_institution	Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department	Faculty of Mechanical Engineering
publishDate	2017
url	http://eprints.utm.my/id/eprint/79112/1/FatemehBehrouziPFKM2017.pdf
_version_	1747818149502255104

Vertical axis current turbine using arm and self-adjusting blade angle for low speed current

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