Characteristics of wind turbine flow field after blade vibration
FANG Yucai1,2*,GAO Zhiying1,2, YAN Mengmeng1,2, CHEN Yongyan1,2
1. College of Energy and Power Engineering, Inner Mongolia University of Technology, Hohhot, Inner Mongolia 010051, China; 2. Key Laboratory of Wind and Solar Energy Utilization Technology Ministry of Education, Hohhot, Inner Mongolia 010051, China
Abstract：In order to study the changes in the characteristics of the flow field of the wind turbine wake after the blades of a horizontal axis wind turbine are shaken, a NACA airfoil wind turbine is used as the research object, and the blade mode is successfully controlled by using a custom UDF code and using dynamic mesh technology, So that the wind wheel performs a waving motion perpendicular to the rotation surface while rotating in three dimensions. In the numerical simulation, In the numerical simulation, the Fluent calculation platform is used to study the velocity field, vorticity field and pressure pulsation characteristics of the wind turbine wake.The research results show that after a vibration is applied, the wind wheel will generate a relative speed gain region near the middle of the leaf and a speed loss region at the tip of the leaf, which will make the blade force more uneven and a larger pressure difference. Accelerate the damage and fracture of the blades; the intensity of vorticity at the blade tip increases after the application of waving vibration, and the shedding of the blade tip vortex is delayed; secondly, the pressure pulsations show periodic fluctuations before and after the vibration is applied, and the radial 0.5 m.The pressure fluctuation is most obvious. By introducing new unsteady factors, this paper reveals the influence of waving vibration on the characteristics of the wind turbine wake flow field, which makes the numerical simulation results closer to the actual operating state of the wind turbine, and provides guidance for wind turbine blade design.