Viðburðir eftir árum


Meistaravörn við verkfræðideild: Örvar Friðriksson

MSc í vélaverkfræði

  • 22.6.2022, 10:00 - 11:00, Háskólinn í Reykjavík

Miðvikudaginn 22.júní kl. 10:00 mun Örvar Friðriksson verja 30 ECTS verkefni sitt til meistaragráðu í vélaverkfræði „Wind tunnel comparison of NACA 1920 vs. NACA 0018 airfoils on a vertical axis wind turbine“. Fyrirlesturinn fer fram í M109 og eru allir velkomnir.

Nemandi: Örvar Friðriksson
Leiðbeinandi: Ármann Gylfason
Prófdómari: Yonatan Afework Tesfahunegn

Abstract
Selecting an appropriate blade profile is critical to the performance of wind turbines. In this thesis, an attempt is made to experimentally assess the performance of vertical axis wind turbines of the H-Darrieus type in a wind tunnel experiment. The turbines under consideration are equipped on the one hand with a NACA 0018 airfoil, which is frequently used in small scale vertical axis turbines, and on the other hand with the NACA 1920 airfoil which in recent numerical work was shown to perform better at low tip speed ratios, with an increase in performance coefficient of up to 56% at tip speed ratio of 1. In order to assess the
performance of the two different airfoils, two small models of the H-type turbines were built, to fit into the open-section wind tunnel at Reykjavik University. Measurements were made on the power produced at various operational conditions, as well as on the wakes behind the wind turbines. The results show some differences in wake structure between the two airfoils, but the measurements of the difference in power delivered by the turbines were not
significant enough for an established results. The measured power difference is 55% in favour of NACA 1920. The bias of the measurements is though so high that it can’t be confirmed. The wake measurements are in line with recent numerical work and that underpins the result from it.



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