کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6765207 | 1431590 | 2018 | 18 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Reduced frequency effects on combined oscillations, angle of attack and free stream oscillations, for a wind turbine blade element
ترجمه فارسی عنوان
اثر فرکانس کاهش یافته در نوسانات ترکیبی، زاویه حمله و نوسان جریان آزاد، برای یک عنصر تیغه توربین بادی
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کلمات کلیدی
فرکانس کاهش یافته، تفاوت فاز، غرفه پویا، نوسان قله، جریان آزاد نامنظم،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
چکیده انگلیسی
The dynamic stall phenomenon in horizontal axis wind turbines causes significant energy waste and sometimes wind turbine failure. For modeling a deep dynamic stall phenomenon of a horizontal axis wind turbine blade element, a numerical simulation of an oscillating NREL's S809 airfoil has been performed at Reynolds number of 106 in an unsteady incident velocity; the velocity oscillates with the same frequency as the airfoil oscillation but with different phase difference (Ï). Since the sliding mesh technique has been applied for the airfoil oscillation, an O-type grid is created resulting in the reduced number of mesh layers. A specific correction improves the quality of the O-type mesh near the sharp trailing edge. For the combined oscillations, the effects of the reduced frequency (k) in the range of 0.05â¤kâ¤0.15 are investigated with the phase differences of Ï=âÏ2, +Ï2,Ï. The results show their significant dependency on k at specific Ï values in particular at Ï=âÏ2. Combined effects of k and Ï can change the aerodynamic loads during dynamic stall significantly compared to loads from a case with a steady incident velocity. These significant changes in the flow structure and aerodynamic loads can affect the wind turbine performance during the dynamic stall phenomenon.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Renewable Energy - Volume 115, January 2018, Pages 252-259
Journal: Renewable Energy - Volume 115, January 2018, Pages 252-259
نویسندگان
Kobra Gharali, Eshagh Gharaei, M. Soltani, Kaamran Raahemifar,