Review of Experimental Approaches for the Analysis of …
475
Emerging economies like India and China are investigating in the aerodynamics
of VAWT from numerical, computational, and experimental aspects [5]. Researches
are ongoing to improvise the turbine in order to get maximum efficiency for various
possibilities of wind speeds and TSR. India as well is embarking on this journey
toward renewable energy. This paper includes results of various experiments and
researches done on VAWT [6]. This paper includes various experiments done in both
wind tunnel and field test setup, and the results are obtained in terms of optimization
of parameters. Unlike various research works up till now, the prime objective of
this study paper is the examination of various experimental approaches which were
utilized for analyzing the efficiency based on the various aerodynamic performance
parameters of the vertical axis wind turbines. These parameters are tip speed ratio
(TSR), coefficient of power (C p ), coefficient of torque (C T ), wind speed (v), and
RPM. This also gives a helping hand to all the researchers who are pursuing and
would like to pursue their researches in this area.
2 Vertical Axis Wind Turbines (VAWT)
The vertical axis wind turbines can be mostly placed into the following kinds:
Darrieus or lift type wind turbine
The rotors consist of curved and straight blades placed
axially on the framework to utilize the lifting force for the
rotation
Savonius or drag type wind turbine The rotors of turbines which utilizes the drag force
difference along its sides due to the shape and use it for the
rotation [1]
3 Experimental Techniques
The results obtained from the experimentations are done mainly by two methodologies wind tunnel experimentation in steady flow and uniform conditions and field
test setup under natural wind conditions and dynamic flows. All the tests are done
under the guidelines given by the IEC and AWEA standards [7].
3.1 Experimentation by Field Tests Methodology
475
Emerging economies like India and China are investigating in the aerodynamics
of VAWT from numerical, computational, and experimental aspects [5]. Researches
are ongoing to improvise the turbine in order to get maximum efficiency for various
possibilities of wind speeds and TSR. India as well is embarking on this journey
toward renewable energy. This paper includes results of various experiments and
researches done on VAWT [6]. This paper includes various experiments done in both
wind tunnel and field test setup, and the results are obtained in terms of optimization
of parameters. Unlike various research works up till now, the prime objective of
this study paper is the examination of various experimental approaches which were
utilized for analyzing the efficiency based on the various aerodynamic performance
parameters of the vertical axis wind turbines. These parameters are tip speed ratio
(TSR), coefficient of power (C p ), coefficient of torque (C T ), wind speed (v), and
RPM. This also gives a helping hand to all the researchers who are pursuing and
would like to pursue their researches in this area.
2 Vertical Axis Wind Turbines (VAWT)
The vertical axis wind turbines can be mostly placed into the following kinds:
Darrieus or lift type wind turbine
The rotors consist of curved and straight blades placed
axially on the framework to utilize the lifting force for the
rotation
Savonius or drag type wind turbine The rotors of turbines which utilizes the drag force
difference along its sides due to the shape and use it for the
rotation [1]
3 Experimental Techniques
The results obtained from the experimentations are done mainly by two methodologies wind tunnel experimentation in steady flow and uniform conditions and field
test setup under natural wind conditions and dynamic flows. All the tests are done
under the guidelines given by the IEC and AWEA standards [7].
3.1 Experimentation by Field Tests Methodology