2026-04-20T13:43:23Zhttps://ebiltegia.mondragon.edu/oai/request

oai:ebiltegia.mondragon.edu:20.500.11984/62432024-04-19T11:16:06Zcom_20.500.11984_473col_20.500.11984_478

00925njm 22002777a 4500 dc Zarketa-Astigarraga, Ander author Penalba, Markel author Martin-Mayor, Alain author Martinez Agirre, Manex author 2023 Small-scale horizontal axis wind-turbines (SHAWTs) are acquiring relevance withinthe regulatory policies of the wind sector aiming at net-zero emissions, while reduc-ing visual and environmental impact by means of distributed grids. SHAWTs operatetransitionally, at Reynolds numbers that fall between 1 105<Re<5 105. Further-more, environmental turbulence and roughness affect the energetic outcome of theturbines. In this study, the combined effect of turbulence and roughness is analysedvia wind tunnel experiments upon a transitionally operating NACA0021 airfoil. Thecombined effects cause a negative synergy, inducing higher drops in lift and effi-ciency values than when considering the perturbing agents individually. Besides, suchlosses are Reynolds-dependent, with higher numbers increasing the differencebetween clean and real configurations, reaching efficiency decrements above 60% inthe worst-case scenario.Thus, these experimental measurements are employed for obtaining the power cur-ves and estimating the annual energy production (AEP) of a 7.8-kW-rated SHAWTdesign by means of a BEM code. The simulations show a worst-case scenario inwhich the AEP reduces above 70% when compared to the baseline configuration,with such a loss getting attenuated when a pitch-regulated control is assumed. Theseresults highlight the relevance of performing tests that consider the joint effect ofturbulence and roughness. 1099-1824 https://katalogoa.mondragon.edu/janium-bin/janium_login_opac.pl?find&ficha_no=173368 https://hdl.handle.net/20.500.11984/6243 AEP estimation SHAWT surface roughness ODS 7 Energía asequible y no contaminante ODS 11 Ciudades y comunidades sostenibles ODS 12 Producción y consumo responsables turbulent effects wind tunnel experiments Impact of turbulence and blade surface degradation on the annual energy production of small-scale wind turbines