The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform

Ahmad Sharifian - One of the best experts on this subject based on the ideXlab platform.

  • Geometrical Optimization of a swirling Savonius wind turbine using an open jet wind tunnel
    alexandria engineering journal, 2016
    Co-Authors: Abdullah Al-faruk, Ahmad Sharifian
    Abstract:

    Abstract It has been suggested that waste heats or naturally available heat sources can be utilized to produce swirling flow by a design similar to that of split channels which is currently used to initiate fire whirls in laboratories. The new design combines the conventional Savonius wind turbine and split channel mechanisms. Previous computational and preliminary experimental works indicate a performance improvement in the new design (named as swirling Savonius turbine) compared to the conventional Savonius design. In this study, wind tunnel experiments have been carried out to optimize the swirling Savonius turbine geometry in terms of maximum power coefficient by considering several design parameters. The results indicate that the blade overlap ratio, hot air inlet diameter and the condition of the top end plate have significant influence on power and torque coefficients, while a larger aspect ratio and closed top end plate have some favourable effects on the performance. The optimum configuration has been tested in four different wind velocities to determine its influence on the performance, and power coefficients were found to be higher in high wind velocities. The performance comparison of optimum configuration with conventional Savonius rotor showed an increase of 24.12% in the coefficient of power.

Riccardo Mereu - One of the best experts on this subject based on the ideXlab platform.

  • cfd study of savonius wind turbine 3d model validation and parametric analysis
    Renewable Energy, 2017
    Co-Authors: Gianluigi Ferrari, Davide Federici, Paolo Schito, Fabio Inzoli, Riccardo Mereu
    Abstract:

    A CFD study is conducted in order to characterize the dynamic behavior of a Savonius vertical axis wind turbine. All simulations are executed using the open source code, OpenFOAM. Both two-dimensional and full three-dimensional cases have been investigated in order to provide a suitable tool for Geometrical Optimization of this rotor. Unsteady simulations are carried out at different tip speed ratio (TSR), varying angular speed of rotor at constant wind speed, using different one and two-equation URANS turbulence models and selecting the k−ω SST for the final analysis. The two-dimensional model was compared with experimental data available in literature and obtained from tests in wind tunnel. This simplified model shows an over-estimation of experimental data, reporting a maximum efficiency at TSR 1, 20% higher than experimental value. The results of 3D model are in good agreement with experiments with a peak of 0.202 at TSR 0.8 for a rotor with aspect ratio 1.1. The influence of the rotor height has been evaluated on flow dynamics of the turbine and its power coefficient.

Abdullah Al-faruk - One of the best experts on this subject based on the ideXlab platform.

  • Geometrical Optimization of a swirling Savonius wind turbine using an open jet wind tunnel
    alexandria engineering journal, 2016
    Co-Authors: Abdullah Al-faruk, Ahmad Sharifian
    Abstract:

    Abstract It has been suggested that waste heats or naturally available heat sources can be utilized to produce swirling flow by a design similar to that of split channels which is currently used to initiate fire whirls in laboratories. The new design combines the conventional Savonius wind turbine and split channel mechanisms. Previous computational and preliminary experimental works indicate a performance improvement in the new design (named as swirling Savonius turbine) compared to the conventional Savonius design. In this study, wind tunnel experiments have been carried out to optimize the swirling Savonius turbine geometry in terms of maximum power coefficient by considering several design parameters. The results indicate that the blade overlap ratio, hot air inlet diameter and the condition of the top end plate have significant influence on power and torque coefficients, while a larger aspect ratio and closed top end plate have some favourable effects on the performance. The optimum configuration has been tested in four different wind velocities to determine its influence on the performance, and power coefficients were found to be higher in high wind velocities. The performance comparison of optimum configuration with conventional Savonius rotor showed an increase of 24.12% in the coefficient of power.

David Infield - One of the best experts on this subject based on the ideXlab platform.

  • design Optimization of thermoelectric devices for solar power generation
    Solar Energy Materials and Solar Cells, 1998
    Co-Authors: Siddig Omer, David Infield
    Abstract:

    Abstract We present an improved theoretical model of a thermoelectric device which has been developed for Geometrical Optimization of the thermoelectric element legs and prediction of the performance of an optimum device in power generation mode. In contrast to the currently available methods, this model takes into account the effect of all the parameters contributing to the heat transfer process associated with the thermoelectric device. The model is used for a comparative evaluation of four thermoelectric modules. One of these is commercially available and the others are assumed to have an optimum geometry but with different design parameters (thermal and electrical contact layer properties). Results from the model are compared with experimental data of the commercial thermoelectric module in power generation mode with temperature gradient consistent with those achievable from a solar concentrator system. These show that it is important to have devices optimized specifically for generation, and to improve the contact layer of the thermoelements accordingly.

Izabel Christina Martins Nogueira - One of the best experts on this subject based on the ideXlab platform.

  • a Geometrical Optimization method applied to a heaving point absorber wave energy converter
    Renewable Energy, 2018
    Co-Authors: Milad Shadman, Segen F Estefen, Claudio A Rodriguez, Izabel Christina Martins Nogueira
    Abstract:

    A methodology for the Geometrical Optimization of wave energy converters (WEC) based on statistical analysis methods and the hydrodynamics of the system in the frequency domain is presented. The Optimization process has been applied on a one-body heaving point absorber for a nearshore region of the Rio de Janeiro coast. The sea characteristics have been described using a five-year wave hindcast and are based on a third generation wind wave model WAVEWATCH III. The Optimization procedure is performed based on the resultant wave spectrum and joint probability distribution. The Optimization process aims at maximizing both WEC absorbed power and absorption bandwidth when providing a natural period close to the predominant wave periods of the sea site. The optimized geometry of the WEC is determined by running a few simulations in the frequency domain and using the design of experiment (DOE) method. The software ANSYS-AQWA is used for the hydrodynamic diffraction analysis, and the DOE method is applied through the Minitab software to determine the optimized geometry. The two primary advantages of this Optimization method are the reduced computational time and the possibility of performing parametric analyses for the WEC geometry.