Abstract
In this work, we proposed an upscaling methodology to extrapolate results from wind tunnel experiments with small-scale model to the full-size hydrokinetic turbine. Small-scale 1:20 wind tunnel experiments (\({\hbox {Re}}\sim 10^4\)), with a three-blade horizontal axis turbine, were carried out looking to identify the characteristic curves of a full-size turbine operating in water (\({\hbox {Re}}\sim 10^6\)). The lack of dynamic similarity due to unmatched Reynolds numbers is analyzed in the framework of blade element momentum theory arguments. A new semi-empirical power-law equation is achieved, uniquely based on the BEM theory which relates the power coefficients of model and full-size turbine to the Reynolds numbers and a power factor, specific to each turbine. Computational fluid dynamic CFD simulations for the same rotor geometry, simulating different runners with varying diameters from small-scale model to full-scale turbine are carried out to validate the upscaling arguments, and to verify the accuracy of the power coefficient curves predicted by proposed methodology.
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Notes
The scaling effects correspond to discrepancies between model and full-size turbines due to lack of geometric, kinematic and/or dynamic similarity.
The blockage effects are the result of the interference of wind tunnels walls on the rotor efficiency.
Technology Readiness Levels (TRLs) are a method for defining the level of maturity of the technology in the industrial sector developed at NASA [36]. TRL3 (level 3): Proof-of-Concept Demonstrated Analytically and/or Experimentally. TRL4 (level 4): Component and/or Breadboard Laboratory Validated.
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Acknowledgements
This work was conducted during a scholarship at the University of Cádiz supported by the International Cooperation Program of the CAPES—Finance Code 001 (Brazilian Federal Agency within the Ministry of Education of Brasil). It was partially supported also by ELETROBRAS-FURNAS S/A by grants for the validation of Numerical Simulations of Wind Turbines, in the framework of Brazilian Energy Agency (ANEEL) R&D funding actions and by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (BR) (Grant No. 303835/2018-4).
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Macias, M.M., Mendes, R.C.F., Oliveira, T.F. et al. On the upscaling approach to wind tunnel experiments of horizontal axis hydrokinetic turbines. J Braz. Soc. Mech. Sci. Eng. 42, 539 (2020). https://doi.org/10.1007/s40430-020-02600-2
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DOI: https://doi.org/10.1007/s40430-020-02600-2