Savonius wind turbine

About: Savonius wind turbine is a research topic. Over the lifetime, 333 publications have been published within this topic receiving 6521 citations.

Numerical modelling of performance on batch blade Savonius turbine using ANSYS

Abstract: Energy is the backbone of the world economy and a means for progress in most of the countries Industrialization. The relationship between energy and an economy of a country are directly related. Wind energy is one of the cleanest source of energy. The energy from wind is extracted via wind turbines. Vertical Axis Wind Turbine (VAWT) is more accessible and portable. The Savonius rotor runs based on the difference of pressure between the buckets and thus it's a drag-based turbine. The design and simple and cheap to be utilized in varying wind speeds. The main objective of this research is to investigate the aerodynamic performance of the batch blade of Savonius wind turbine and improving its performance via parametric investigation. To accomplish this, Computational Fluid Dynamic is utilized with the aid of ANSYS 16 to model the flow around the blade. The variables are the number of blades and shape of the blade considering the geometric parameter involved in the performance of the blade. A 3D model was modelled using CAD software which is SolidWorks 2014. With variable of shape of blade and number of blades, 12 models was prepared and the moving mesh together with the fluid flow was developed using ANSYS Fluent. Five different wind speeds was simulated to determine the efficiency of the model. With the finding of velocity of wind hitting the blades, the rpm of blades was found and thus the efficiency of Savonius rotor blade. Results show that 4 bladed Savonius rotor has the average lowest efficiency. Whereas twisted models shows great potential in harnessing higher.

Simulation Study on the Performance of Vertical Axis Wind Turbine

Abstract: The present study considered the design improvement of Savonius rotor, in order to increase the efficiency of output power. An investigation was conducted to study the effect of geometrical configuration on the performance of the rotor in terms of coefficient of torque, coefficient of power and power output. Modification of conventional geometry has been designed by combining the effect of number of blades and shielding method. CFD simulation was conducted to analyze the flow characteristic and calculate the torque coefficient of all the rotor configurations. The continuity and Reynolds Averaged Navier-Stokes (RANS) equations and realizable k-e epsilon turbulence model are numerically solved by commercial software Ansys-Fluent 14.0. The results obtained by transient and steady method for the conventional two bladed Savonius rotor are in agreement with those obtained experimentally by other authors and this indicates that the methods can be successfully applied for such analysis. The modified 3 and 4 bladed rotors with hybrid shielding method gave the highest maximum power coefficient which 0.37 at TSR 0.5 and output power exceed 4 watts with rotor dimensions of 0.2m width and 0.2m height. This blade configuration also is the best configuration by several percentages compared to the other model from the previous study

Study of the Efficiency of a Computer Code to Analyze the Performance of a Rotating Machine: Application on a Savonius Wind Turbine

Abstract: The wind turbine is one of the sources of renewable energies very solicited to solve global energy problems. Among the various technologies of a rotor, that of a Savonius wind turbine is technically best suited in developing sending countries. Despite its weakness in performance, it has some advantages exploitable both on its mechanical torque and on its starting speed. In this work, we tested the effectiveness of a computer code that we designed to increase its efficiency before multiplying it. To do this, the numerical simulation of the aerodynamic performances of a vertical axis wind turbine of the Savonius type was chosen in order to validate our code. The Computational Fluid Dynamic (CFD) code, which is designed in Fortran, makes it possible to give fine predictions on the profiles of pressure fields, velocities and some aerodynamic characteristic variables of the wind turbine (moment, mechanical torque, shock wave, turbulence, ...) characterizing the performance of a rotating machine. The numerical resolution method adopted in this analysis is that of explicit finite difference. The Lax discretization scheme at two-time steps followed by addition of corrected artificial (numerical) viscosity was used. The spatiotemporal precision is in two orders, whose stability is dictated by the so-called CFL (Current Friedrich Levy) condition which imposes a constraint on the time step Δt. A detailed study of the results obtained and phenomena developed all around the blade have been made in order to draw conclusions.

Modification and Testing of Wind Turbine with Double Savonius

Abstract: Indonesia geographically located at tropical region where the wind is very fluctuate and relatively slow. Therefore it is important for designer to investigate the proper design of the slow wind speed turbine that applicable in Indonesia. In this paper, Savonius wind turbine is selected and modified with double level to explore its capability in generating voltage. The main aim of this study is to investigate the performance of the double Savonius turbine in term of its capability in generating voltage. In experimental test, it can be obtained that the double Savonius Turbine could effectively generate 12V at 3 m/s and 17V at 5.4 m/s.