Computational assessment of the influence of the overlap ratio on the power characteristics of a Classical Savonius wind turbine

Kacprzak, Konrad; Sobczak, Krzysztof

doi:10.1515/eng-2015-0039

Cited by 15 publications

(7 citation statements)

References 7 publications

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“…The study was conducted in an overlap ratio of 0 to 0.3. The results of the study show that the overlap ratio of 0 produces the highest Cpmax [5]. In another study regarding the overlap ratio that has been carried out on horizontal axis water turbines, it shows that Cpmax is obtained in 0.3 overlaps.…”

Section: Introductionmentioning

confidence: 78%

The effect of multi-stage modification on the performance of Savonius water turbines under the horizontal axis condition

et al. 2020

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Indonesia has the abundant potential of hydropower but not yet processed optimally, which intensely depends on fossil fuel. Hydropower installed in Indonesia is only 11,272 MW, from the estimated potential approximately 94,476 MW. This data shows that 89% of the hydropower potential in Indonesia has not been processed. One of the present efforts to utilize this resource is addressed to develop the Savonius water turbine. Conventional water Savonius turbines have a comprehensible structure and easy to be applied. However, the turbines produce relatively small power, which requires further assessment to improve its performance. The current study is performed by considering geometric changes on the water Savonius turbine to observe their effect on power characteristics. Considered changes are made on the number of stages, and the angle between stages, specifically a single-stage, two-stage 0°, Two-stage 90°, three-stage 0°, and three Stage 120°. The research was carried out by designing simulation model using ANSYS software with CFX Solver. Water speed is determined to 0.8 m/s, while plates with 110 mm in diameter and 110 mm in height are incorporated as rotor configuration. Based on this study, it can be concluded that the addition of the stage affected improving the performance of the Savonius water turbine, where the multi-stage turbine experienced an increment compared to conventional water turbines. The interesting tendency was found on the two-stage rotors with angle of 0° which produced a smaller Cpmax compared to the conventional water Savonius turbines.

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Section: Introductionmentioning

confidence: 78%

The effect of multi-stage modification on the performance of Savonius water turbines under the horizontal axis condition

et al. 2020

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“…The shear stress transport (SST) turbulence model, which is widely used and proved its quality in many different applications, especially for low Reynolds number flows as in this case, was applied. 17 , 38 – 40 Due to very limited temperature changes, the flow was considered to be isothermal.…”

Section: Methodsmentioning

confidence: 99%

Methods for determination of stagnation in pneumatic ventricular assist devices

et al. 2018

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Background:A pneumatic paediatric ventricular assist device developed at the Foundation of Cardiac Surgery Development, Zabrze, equipped with valves based on J. Moll’s design, with later modifications introduced at the Institute of Turbomachinery, Lodz University of Technology, was tested numerically and experimentally. The main aim of those investigations was to detect stagnation zones within the ventricular assist device and indicate advantages and limitations of both approaches.Methods:In the numerical transient test, a motion of the diaphragm and discs was simulated. Two different methods were used to illustrate stagnation zones in the ventricular assist device. The flow pattern inside the chamber was represented by velocity contours and vectors to validate the results using images obtained in the laser particle image velocimetry experiment.Results:The experimental light-based method implied problems with proper illumination of regions in the wall vicinity. High-resolution flow data and other important parameters as stagnation regions or flow patterns in regions not accessible for light in the particle image velocimetry method are derived in the numerical solution. However, computations of a single case are much more time-consuming if compared to a single experiment conducted on a well-calibrated stand.Conclusion:The resulting main vortexes in the central part of the pump chamber and the velocity magnitudes are correlated in both methods, which are complementary and when used together offer better insight into the flow structure inside the ventricular assist device and enable a deeper analysis of the results.

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“…The flow simulations were performed in a transient mode with the pressure-based ANSYS Fluent solver. Reynolds-averaged Navier-Stokes (RANS) equations were calculated with the k-ω SST (Shear Stress Transport) turbulence model of Menter [38], which is one of the most frequently used in Savonius turbine simulations [16,39,40], due to its good performance in the adverse pressure gradient and separated flows. Despite the fact that changes in air density are negligible, the fluid was defined as compressible according to the ideal gas law, in order to compensate for numerical instabilities resulting from mesh deformation and remeshing.…”

Section: Definition Of Flow Simulationsmentioning

confidence: 99%

Numerical Investigations of the Savonius Turbine with Deformable Blades

et al. 2020

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Savonius wind turbines are characterized by various advantages such as simple design, independence of wind direction, and low noise emission, but they suffer from low efficiency. Numerous investigations were carried out to face this problem. In the present paper, a new idea of the Savonius turbine with a variable geometry of blades is proposed. Its blades, made of elastic material, were continuously deformed during the rotor revolution to increase a positive torque of the advancing blade and to decrease a negative torque of the returning blade. In order to assess the turbine aerodynamic performance, a two-dimensional numerical model was developed. The fluid-structure interaction (FSI) method was applied where blade deformations were defined by computational solid mechanics (CSM) simulations, whereas computational fluid dynamics (CFD) simulations allowed for transient flow prediction. The influence of the deformation magnitude and the position of maximally deformed blades with respect to the incoming wind direction were studied. The aerodynamic performance increased with an increase in the deformation magnitude. The power coefficient exceeded Cp = 0.30 for the eccentricity magnitude of 10% and reached 0.39 for the highest magnitude under study. It corresponded to 90% improvement in comparison to Cp = 0.21 in the case of the fixed-shape Savonius turbine.

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Computational assessment of the influence of the overlap ratio on the power characteristics of a Classical Savonius wind turbine

Cited by 15 publications

References 7 publications

The effect of multi-stage modification on the performance of Savonius water turbines under the horizontal axis condition

The effect of multi-stage modification on the performance of Savonius water turbines under the horizontal axis condition

Methods for determination of stagnation in pneumatic ventricular assist devices

Numerical Investigations of the Savonius Turbine with Deformable Blades

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