一种H型垂直轴风力机翼型的深度失速研究

Study of post-stalled airfoil of a H-type vertical axis wind turbine

以自主研发的H型垂直轴风力机的翼型为研究对象,分别采用URANS、LES和DES三种不同的湍流模型,在Fluent中进行2.5 D的非定常计算,对比研究该翼型在发生深度失速时的升阻性能以及翼型周围流场的分布.研究结果表明:该翼型的静态失速攻角为30°,相比原模型的失速攻角23°有明显的提高;在翼型的攻角小于静态失速攻角时,三种湍流模型模拟计算的升力和阻力的性能相差不多,且和原模型的试验值比较接近;在翼型发生深度失速后,DES湍流模型的模拟结果不仅具有一定的可靠性,而且能够捕捉到翼型周围存在的涡流状况.

Taking the self-developed airfoil of H-type vertical-axis wind turbine（VAWT）as a research object and adopting the URANS,LES,DES three different turbulence modes,non-stationary flow field of 2.5-dimension is evaluated with software Fluent,and comparative study of lift and drag performance and distribution of flow field around airfoil are when post-stall happens.The result shows that the stead-state stalling angle of attack of the airfoil is 30°,that larger than that of original model of 33°.Compared to the original model,significant improvement of stall is obtained.When the angle of attack of the airfoil is less than the steady-state stalling angle of attack,the performance of the lift and drag is close to that of original mode when the three kinds of turbulence modes are used for flow field simulation.After the airfoil is poststalled,simulation result with DES turbulence mode not only has a certain reliability,but also can capture the condition of vortex flow around the airfoil.