水平轴风力机叶片在风沙流场中的数值模拟

Numerical simulation of horizontal wind turbine blad in the sand-flow field

采用计算流体力学软件FLUENT,选用SSTκ-ω湍流模型对750kW水平轴风力机叶片进行三维定常流风场和风沙离散项的数值模拟,得出叶片周围风场绕流特性。模拟结果表明风力机叶片迎风面受风压最大,风绕流风力机叶片发生分离和涡流现象。在风沙离散项中风带动沙粒的不均匀性使风力机叶片周围沙粒迹线出现分离,在叶片中部及叶尖处浓密。因此,应在风力机迎风面中部及叶尖处增设耐磨层,防止风沙频繁地区风沙对叶片产生的风蚀现象。

The 750kW horizontal wind turbine blade is simulated in 3D steady flow of the wind field and the sand discrete item used the computational fluid dynamics software FLUENT and selected the SST K-ω turbulence model, and gain the flow character- istics of the wind farm around the blade. The simulation results show that the maximum wind pressure exists in the wind turbine blade windward side, and the wind appears separation and whirlpool phenomenon when flowing around wind turbine blade. The nonuniformity of sand around wind turbine blades makes separation of sand trace in the sand discrete items. The sand trace is thicker in the middle of blade and blade tip. Therefore, wear layer should be added in the middle of the windward of wind turbine and blade tip, in order to prevent sand erosion of blade caused by sand-flow.