کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1719777 1520244 2016 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The effects of yawing motion with different frequencies on the hydrodynamic performance of floating vertical-axis tidal current turbines
ترجمه فارسی عنوان
اثرات حرکت جابجایی با فرکانس های مختلف بر عملکرد هیدرودینامیکی توربین های جریان شناور عمودی شناور عمودی
کلمات کلیدی
انرژی فعلی جزر و مد، توربین فعلی جزر و مد عمودی، عملکرد هیدرودینامیکی، ضریب جرمی اضافه شده، ضریب دمیدن
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی دریا (اقیانوس)
چکیده انگلیسی


• The yawing motion of the turbine in a floating tidal current power station induces oscillations in the main hydrodynamic coefficients of turbine.
• This paper studied the hydrodynamic performance of a vertical-axis turbine being oscillated under constant inflow conditions using CFD software.
• Time-varying curves of the main hydrodynamic coefficients under different frequencies were also obtained using the CFD software.
• CFD and the least square method were used in this study to obtain the added mass coefficient and the damping coefficient.

Under real sea conditions, the hydrodynamic performance of floating vertical-axis tidal current turbines is affected by waves and currents. The wave circular frequency is a significant factor in determining the frequencies of the wave-induced motion responses of turbines. In this study, the ANSYS-CFX software (manufacturer: ANSYS Inc., Pittsburgh, Pennsylvania, United States) is used to analyse the hydrodynamic performance of a vertical-axis turbine for different yawing frequencies and to study how the yawing frequencies affect the main hydrodynamic coefficients of the turbine, including the power coefficient, thrust coefficient, lateral force coefficient, and yawing moment coefficient. The time-varying curves obtained from the CFX software are fitted using the least-squares method; the damping and added mass coefficients are then calculated to analyse the influence of different yawing frequencies. The simulation results demonstrate that when analysing non-yawing turbines rotating under constant inflow, the main hydrodynamic coefficient time-varying curves of yawing turbines exhibit an additional fluctuation. Furthermore, the amplitude is positively correlated with the yawing frequency, and the oscillation amplitudes also increase with increasing yawing frequency; however, the average values of the hydrodynamic coefficients (except the power coefficient) are only weakly influenced by yawing motion. The power coefficient under yawing motion is lower than that under non-yawing motion, which means that yawing motion will cause the annual energy production of a turbine to decrease. The fitting results show that the damping term and the added mass term exert effects of the same level on the loads and moments of vertical-axis turbines under yawing motion. The results of this study can facilitate the study of the motion response of floating vertical-axis tidal current turbine systems in waves.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Ocean Research - Volume 59, September 2016, Pages 224–235
نویسندگان
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