表面微沟槽对风力机翼型气动性能的影响研究

Influence of Surface Riblets on the Aerodynamic Performance of Wind Turbine Airfoils

采用数值模拟方法对表面纵向布置微沟槽的风力机翼型的气动性能进行研究。基于Transition SST模型,采用商用计算流体动力学(CFD)软件,研究了L型和V型2种不同类型的微沟槽的减阻效应,考虑了不同雷诺数和不同翼型条件下,表面微沟槽对风力机翼型升阻力特性的影响。通过对比升、阻力系数及表面摩擦力系数,探讨了风力机翼型表面微沟槽的减阻机理。结果表明:在最优的沟槽几何参数条件下,L型沟槽相比V型沟槽具有更好的减阻效果,DU翼型最大减阻率达到5.6%;采用最优沟槽几何参数时,微沟槽在较大的雷诺数和攻角范围内都具有减阻效果。

The aerodynamic performance of several wind turbine airfoils with longitudinally arranged surface riblets was studied by numerical simulation method.Based on the transition SST model and using commercial computational fluid dynamics(CFD)software,the drag reduction effects of two different types of L-shaped and V-shaped riblets were studied.The effect of riblets on the lift and drag characteristics of wind turbine airfoils was also studied,considering the variation of Reynolds number and airfoil geometry.By comparing the lift and drag coefficients,together with the surface friction coefficient,the drag reduction mechanism of surface riblets for wind turbine airfoils was discussed.Results show that under the condition of optimal riblet geometric parameters,L-shaped riblets have better drag reduction effect than V-shaped riblets,and the maximum drag reduction rate for the DU airfoil reaches up to 5.6%.Using the optimal geometric parameters,surface riblets have drag reduction effects in a wide range of Reynolds number and angle of attack.