Aerodynamic performance improvements of a vertical axis wind turbine by leading-edge protuberance
نویسندگان
چکیده
A detailed numerical study has been carried out to investigate the effects of leadingedge protuberance as a novel flow-separation control-technique for vertical-axis-windturbine (VAWT). The aerodynamic performance stationary protuberanced blade and an associated H-type Darrieus VAWT made three blades were investigated using unsteady Reynolds-Averaged-Navier-Stokes (URANS) Implicit Large Eddy Simulation (ILES) methods. current involves comprehensive set five different types sinusoidal leading-edge protuberances with wavelengths amplitudes. It is found that this passive flow-control-method can favourably change lift drag at stall post-stall regions, which high importance VAWTs. Static variation be changed from leading-edge-stall type trailing-edge-stall type. This attributed “bi-periodic” phenomenon over suction side reduced turbulence kinetic-energy production. Protuberance amplitude was more important than wavelength in improving performance. Of all tested cases, 1% chord-length (c) 2.5%c behaves best. significantly increase power-coefficient low tip-speed-ratios, are dominated by conditions. dynamic delayed coherent spanwise wavy flow-structures on suction-side observed.
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ژورنال
عنوان ژورنال: Journal of Wind Engineering and Industrial Aerodynamics
سال: 2021
ISSN: ['0167-6105', '1872-8197']
DOI: https://doi.org/10.1016/j.jweia.2021.104535