I am a student of Mechanical Engineering. I am doing CFD opf Archimedes Winf Turbine.
I am trying to validate the result of Paper. But the problem is that tha value of Power Coefficient is ever Increasing with the increase of Tip Speed Ratio/Angular Velocity. I need Expert Guidance. What could be the reason of this error??
Thanks in Advance
Regards:
Muhammad Bilal
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The power coefficient depends on several factors, among which are the type of turbine, that is, if it is a horizontal or vertical axis type; in the case of a horizontal axis, this also depends on the number of blades, the specific speed or trip speed ratio ( λ ), and the blade pitch angle of the turbine β .The optimal design of tip speed ratio (TSR) will directly affect the power generated and, consequently, the effectiveness of the investment made. The optimum tip speed ratio depends on the number of blades in the wind turbine rotor. The fewer the number of blades, the faster the wind turbine rotor needs to turn to extract maximum power from the wind. The Tip Speed Ratio (TSR) is an extremely important factor in wind turbine design. TSR refers to the ratio between the wind speed and the speed of the tips of the wind turbine blades. The further away from the center, the faster the blades spin. The ideal tip speed ratio depends on factors such as the lift-drag ratio and the number of blades. for any wind turbine with a tip-speed ratio less than 10, the power coefficient is unlikely to exceed 0.585.
https://www.researchgate.net/figure/Power-coefficient-C-p-versus-tip-speed-ratio-l_fig1_261831782#:~:text=The%20power%20coefficient%20increases%20for,variables%20that%20maximizes%20the%20objective.
https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.mdpi.com%2F1996-1073%2F16%2F6%2F2774&psig=AOvVaw19BWXen_H-dRLtmm7hjWf1&ust=1720442544916000&source=images&cd=vfe&opi=89978449&ved=0CBEQjRxqFwoTCLCez7z6lIcDFQAAAAAdAAAAABAE
The ratio U/C is tip speed / gas velocity. For high reaction aerofoils the optimum value is U/C = .9, while for impulse designs it is about 0.5. So, the blade details will decide the value at which the best efficiency occurs.
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