Kalakanda Alfred Sunny and Nallapaneni Manoj Kumar 4 (2016) represent the aerodynamics modelling, fabrication and evaluation of the performance of vertical axis wind turbine (VAWT). They had modelled and fabricated 3 bladed VAWT using NACA 0012 airfoil. This prototype model has been tested in the subsonic wind tunnel to study the performance parameters like mechanical power obtain in turbine shaft, power available the wind, tip speed ratio (TSR) and power coefficient.
Rosario Lanzafame et al. 6 (2013) described the approach to develop a 2D CFD model of H type Darrieus Wind Turbines. The Author showed that The RANS Turbulence Modelling performs a strategic role for the estimation of the flowfield around blades of wind turbines and different Turbulence Models were investigated in Fluent solver. The outcomes reveal the good competences of the Transition SST turbulence model instead of that the classical fully turbulent models.
Naveed Durrani et al. 7 (2011) have been evaluated different symmetric and cambered airfoil for 2D three bladed vertical axis wind turbine (VAWT). Effects of the thickness of the blade, intensity of turbulence in the flow, camber, domain size, mesh independence and impact of different turbulence models are examined to attain the overall best design configuration.
Xiaoting LIANG et al. 8 (2017) elaborated that Savonius rotors need a low torque for start up, however efficiency is low. Darrieus rotors have high efficiency, but they are hard to start up. They prepared combined rotor means combination of the darrieus and Savonius rotor aiming with a low start up requirement and high aerodynamic performance. In this paper, the effects of the radius ratio and the attachment angle on the efficiency and starting performance are inspected by a numerical simulation.
Mohamed A. Sayed et al. 9 (2012) studied the aerodynamic simulations of low-velocity flow past over two-dimensional S-series wind turbine blade profiles. The drag and lift forces are the utmost crucial parameters in investigating of the performance of the wind turbine. Thus, an attempt to analyze these forces on the blades of the wind turbine at various sections was performed. At various wind velocity, the performance of different blade profiles was investigated and based on the maximum sliding ratio, the optimum blade profile for each wind velocity is determined.
A. Rossetti et al. 10 described the importance of the self-starting ability of wind turbine. Moreover, the comparison among 2D and 3D data revealed the significance of 3D effects such as tip effects and secondary flows. These effects were presented to have a positive influence on start-up. The start-up ability of H-Darrieus seems to be affected by many various parameters, which contains the secondary flows, the finite aspect-ratio of the blades and three-dimensional aerodynamic effects.
Dr. S. P. Vendan et al. 11 showed the designing of a wind turbine for extracting the low wind speed in the urban area. Author has chosen NACA 63 series airfoil profile because these series have good low wind speed characteristics and the better power curve is obtained in the low and medium range of wind speed.
Abhishek Subramanian et al. 12 has done the investigation on the effect of airfoil profile and solidity on the performance of Vertical Axis Wind Turbines (VAWT). They have analyzed four different airfoil profiles such as NACA 0012, NACA 0015, NACA 0030 and AIR 001. It was noted that NACA 0030 airfoil performs better at lower values of tip speed ratio. They have also analyzed that two-bladed VAWTs produced more power than the three bladed wind turbines. This showed that turbines with lesser solidity achieve better at high ?.
Abdolrahim Rezaeiha et al. 13 described the evaluation of the optimization of domain size. For accurate prediction of the performance of VAWTs using numerical simulation, the domain size should be large enough to minimize the effects of blockage and uncertainties in the boundary conditions on the results. Results revealed that the distance from the turbine centre to the domain inlet and outlet of 10D each, (D is diameter of rotor) a domain width should be 20D and a diameter of the rotating core of 1.5D are discovered to be safe choices to minimize the effects of blockage and uncertainty in the boundary conditions on the results.
M. H. Mohamed et al. 14 has given detail about a numerical analysis to enhance the overall performance of this wind turbine. They done the evaluation of Gambit and ANSYS Workbench meshing tools for the computational modeling to review a final numerical sequence for the H-Darrieus type wind turbine performance. Outcomes show that the accuracy of ANSYS Workbench meshing is enhanced by SST K-omega model still it is not suggested for other turbulence models. Additionally, the CFD technique is employed to evaluate the performance of turbine with various airfoil shapes. The outcomes informed new profiles for the turbine with greater efficiency than the regular airfoils by 10%.
Marco Raciti Castelli et al. 19 represented a CFD model for the aerodynamic forces acting on a blade and energy performance evaluation of vertical-axis Darrieus wind turbine. They have designed the 3D model and validated this model with computational simulation against experimental data using NACA 0021 profile three-bladed wind turbine. To better understanding of physics about VAWT can be attained by knowing flow field characteristics for various tip speed ratio and compare the simulation result.
Robert Howell et al. 23 have studied both experimentally and numerically for the small scaled vertical axis wind turbine. The Outcomes of Wind tunnel are presented for various wind speed, solidity and tip-speed ratio as well as the surface finish of rotor blade. They experimentally proved that the surface finish of blade has the significant impact on the performance of wind turbine.