Abstract
The Performance of Vertical Axis Wind Turbine (VAWT) is highly dependent on its blades strength and stability. This paper is mainly dealing with enhancing the blades' structure of Vertical Axis Wind Turbine which is suitable for countries that have a moderate wind speed. The suggested improvement entails employing reinforced light composite blades using Zinc-Oxide (ZnO) nanoparticles (NPs) synthesized by the polymer-pyrolysis route. To assess the performance of the proposed design, a multistage Savonius blades prototype is built to realize the essential ultrasonic and vibration tests. Five different composite blades with different ZnO volume percentages are tested for assessing their values of the attenuation coefficient and the phase velocity and evaluating the composite material robustness. A wind tunnel is also used to evaluate the prototype power coefficient. Besides, the effect of the shift-angles between the different blades' stages on the turbine efficiency has been evaluated. The theoretical analysis and experimental results of the natural frequencies ensured that the proposed model can avoid the resonance scenarios through working at considerably high rotating speeds.
Highlights
FOSSIL fuels are the main effective conventional energy sources in modern industrial development
The ultrasonic diagnostics tests are performed dealing with five different specimens of the composite blades to measure the values of (ζ) and (Cp) in addition to (Ed) considering the first two echoes
This paper is mainly concerned with enhancing the blades' structure of a vertical axis wind turbine, which is appropriate for countries that have a reasonable wind speed
Summary
FOSSIL fuels are the main effective conventional energy sources in modern industrial development. The rapid depletion problem can be resolved using clean and cheap renewable resources like wind and solar energy. Widespread studies were concerned with the computational fluid dynamics (CFD) usage [29,30,31] These studies were dealing with the wind turbine simulations by focusing on the aerodynamics and air flow. A widespread study dealing with composite blades' fatigue of large Darrieus VAWT was introduced by Kumar et al [35] They inferred that most of the turbine failures are related to the blade's fatigue due to constantly aerodynamic force variations on each revolution. Whereas Mohamed et al [38] achieve their objective through optimizing the position of an obstacle that shields the returning blade of a Savonius wind turbine This optimization process led to a considerable improvement of the power coefficient in the range of 27%. The effect of changing the shift-angle between the turbine blades stages (layers) on the prototype efficiency was assessed
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