Drag Estimation in the Near Wake of the NREL's Airfoils Based on Hot-Wire Data

This paper presents the results of drag coefficient estimations for different types NREL airfoils based on experimental data. Namely, it was S803, S807, S813, and S817 profiles with same chord length. The investigations were conducted at three angles attack α =0°, =±5°, chord-based Reynolds numbers 0.6×10 5 , 1.3×10 2.6×10 . While, measuring cross-sections placed behind trailing edge x∙c −1 ≈0.2, 0.4 1.0. Experimental data collected using a hot-wire split fiber probe 55R55, which allowed us to estimate characteristics turbulent flow in stream-wise crosswise directions. According obtained results, highest lowest Cd values correspond respectively. Moreover, show that more asymmetric S803 S807 have resistance zero attack. Research background: Application Antonia Rajagopalan methodology assessment various stream bodies. Purpose article: Comparative evaluation coefficients instantaneous velocity distribution behind. Methods: Hot-wire anemometry 55R55. Findings & Value added: corresponds profile. asymmetry airfoil shape has significant impact its characteristics.