1. Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China 2. Jiangsu Power Design Institute Limited Company, China Energy Engineering Group, Nanjing 211102, China 3. Jiangsu Key Laboratory of Hi-Tech Research for Wind Turbine Design, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
The wind field of wind turbine considering 6 yaw angles (0, 5, 10, 20, 30 and 45 degrees) under the worst blade stop position was simulated based on computational fluid dynamics (CFD) method in order to analyze the flow field characteristics and aerodynamic performance of large-scale wind turbines under complex operating conditions in severe storms and rainstorms. A 5 MW wind turbine researched independently by Nanjing University of Aeronautics and Astronautics was taken as an example. The discrete phase model (DPM) was added and the wind-rain coupling synchronous iterative calculation was conducted. Then the effects of different yaw angles on the characteristics of wind field and rain field around wind turbines were analyzed. The new models of wind-rain equivalent pressure coefficient were constructed, and corresponding calculation formulas were presented. The equivalent pressure coefficient of tower and blades were systematically analyzed for different yaw angles conditions under wind and rain interaction. Results show that the effect of additional rain load on the pressure on the windward side of the blade and the 40 degrees on both sides of the windward side of the tower cannot be neglected.
Tab.1Structure parameters and model of 5 MW large wind turbine
Fig.1Actual and equivalent wind direction planforms of wind turbine under yaw states
Fig.2Diagrams of computational domain and mesh generation
Dp / mm
ΔD/mm
Dp / mm
ΔD/mm
1
0~1.5
4
3.5~4.5
2
1.5~2.5
5
4.5~5.5
3
2.5~3.5
6
5.5~6.0
Tab.2Groupings of raindrop diameters
Fig.3Contrast diagrams between CFD numerical simulation results and code values under wind field
Fig.4Wind pressure coefficient distribution on typical sections of tower of different conditions
Fig.5Velocity streamline distribution on typical interference sections of tower of different conditions
Fig.6Vorticity distribution on typical interference sections of tower of different conditions
Fig.7Distribution curves of raindrop number and horizontal velocity on tower and blade surfaces of different conditions
Fig.8Rain load distribution on different height surfaces of tower and blades of different conditions
Fig.9Raindrops on wind turbine surfaces of different conditions
Fig.10Rain pressure coefficient distribution on typical sections of tower of different conditions
Fig.11Comparison curves of rain pressure coefficient of blades of different conditions
Fig.12Curves of equivalent pressure coefficient on typical sections of tower of different conditions
Fig.13Comparison curves of equivalent pressure coefficient of blades of different conditions
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