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| Vortex characteristics of horizontal axis wind turbine blade and wake flow field based on dynamic mesh |
| GAO Wei1, ZHANG Liru1,2*, YAO Huilong1, YAN Rong1 |
| 1. College of Energy and Power Engineer, Inner Mongolia University of Technology, Hohhot, Inner Mongolia 010051, China; 2. Key Laboratory of Wind Energy Technology, Ministry of Education, Inner Mongolia University of Technology, Hohhot, Inner Mongolia 010051, China |
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Abstract In order to study the generation and evolution process of vortices in the flow field of wind turbines, the overlapping grid method in the moving mesh technology was droped to calculate the flow field of horizontal axis wind turbines, and the Q criterion was used to carry out visual analysis on the structure of blade surface, tip vortex and central vortex, and the calculated results with those calculated by sliding mesh under the same working condition were compared. The results show that by comparing the vorticity distribution of blade surface with the two methods in different sections, the flow separation area on suction surface is larger and more details of boundary layer separation on blade surface can be captured by the moving mesh method. The ″tip vortex jump″ phenomenon occurs when the tip vortex moves downstream. In the wake flow field, the vortex distribution of the central vortex is bimodal. In the range of 0.5D~2.0D behind the wind turbine, the tip vortex and the central vortex have mixed diffusion. The distribution trend of the central vortices in the wake flow field is basically the same according to the calculation of the moving grid and the sliding grid. The vortex peak value is larger according to the moving grid method, and the central vortices are diffused earlier according to the sliding grid method. Compared with the sliding mesh method, the moving mesh method is more advantageous to study the vortices in the flow field of wind turbines.
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Received: 15 May 2021
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