Authors :
Priyam Deka
Volume/Issue :
Volume 7 - 2022, Issue 4 - April
Google Scholar :
https://bit.ly/3IIfn9N
Scribd :
https://bit.ly/3EuLsBm
DOI :
https://doi.org/10.5281/zenodo.6471838
Abstract :
- In this era of technological advancement, the
demand for energy requirements is increasing globally.
With a limited stock of fossil fuels and the pollution issue
related to the burning of these fuels, the world needs to
find an alternative of it, which must be cleaner and
greener. This is where wind energy comes in and plays a
vital role as it is a clean source and has a very promising
future in the global energy sector. Savonius turbine is a
type of vertical axis wind turbine (VAWT) which is
predominantly rotated by the drag force from the wind.
It is self starting and can extract wind energy from low
wind speeds and is very practical to install it in crowded
places due to its compact geometry. This thesis is a review
of the previous works presented by different authors.
This project aims at discovering the influence of various
design and performance parameters (aspect ratio, overlap
ratio, tip speed ratio, blade shape, number of rotor blades
and number of stages), turbulence models and turbine
geometries on the performance of Savonius vertical axis
wind turbine. A conventional Savonius vertical axis wind
turbine (VAWT) with aspect ratio of 1, overlap ratio of
0.15 and TSR of 0.8 shows the maximum coefficient of
power (CP) The performance of conventional rotors can
be enhanced by use of helical rotors; multi- staging and
other modified blade geometries. Helical rotors with
blade twist angle of 900
are better performing rotors than
the conventional rotors. Modified Bach type rotor with a
blade arc angle of 1350
, aspect ratio of 1.1, overlap ratio
of 0.1 and at tip speed ratio (TSR)= 0.8 show the
maximum coefficient of power (CP) of 0.30. The results of
numerical analyses were compared with that of the
experimental data and it is found that for 2-D numerical
analyses, realizable k-ɛ turbulence model shows better
accuracy of estimation and for 3-D analyses, SST k- ω
turbulence model shows better agreement with the
experimental data
Keywords :
savonius wind turbine, wind energy, renewable energy, coefficient of power, tip speed ratio.
- In this era of technological advancement, the
demand for energy requirements is increasing globally.
With a limited stock of fossil fuels and the pollution issue
related to the burning of these fuels, the world needs to
find an alternative of it, which must be cleaner and
greener. This is where wind energy comes in and plays a
vital role as it is a clean source and has a very promising
future in the global energy sector. Savonius turbine is a
type of vertical axis wind turbine (VAWT) which is
predominantly rotated by the drag force from the wind.
It is self starting and can extract wind energy from low
wind speeds and is very practical to install it in crowded
places due to its compact geometry. This thesis is a review
of the previous works presented by different authors.
This project aims at discovering the influence of various
design and performance parameters (aspect ratio, overlap
ratio, tip speed ratio, blade shape, number of rotor blades
and number of stages), turbulence models and turbine
geometries on the performance of Savonius vertical axis
wind turbine. A conventional Savonius vertical axis wind
turbine (VAWT) with aspect ratio of 1, overlap ratio of
0.15 and TSR of 0.8 shows the maximum coefficient of
power (CP) The performance of conventional rotors can
be enhanced by use of helical rotors; multi- staging and
other modified blade geometries. Helical rotors with
blade twist angle of 900
are better performing rotors than
the conventional rotors. Modified Bach type rotor with a
blade arc angle of 1350
, aspect ratio of 1.1, overlap ratio
of 0.1 and at tip speed ratio (TSR)= 0.8 show the
maximum coefficient of power (CP) of 0.30. The results of
numerical analyses were compared with that of the
experimental data and it is found that for 2-D numerical
analyses, realizable k-ɛ turbulence model shows better
accuracy of estimation and for 3-D analyses, SST k- ω
turbulence model shows better agreement with the
experimental data
Keywords :
savonius wind turbine, wind energy, renewable energy, coefficient of power, tip speed ratio.
