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采用数值模拟方法研究了圆弧形、椭圆形和曲率连续无吸力峰前缘对叶型附面层发展的影响规律。通过提取不同工况下叶面附面层参数并结合叶表附面层速度型的变化,发现前缘吸力峰对叶型性能的影响本质在于吸力峰影响了附面层的起始发展状态。前缘吸力峰扩压参数D_(spike)过强会导致附面层起始发展状态恶化,造成提前转捩,甚至出现分离泡,叶表附面层迅速增厚,叶型损失增大,可用攻角范围减小。研究还表明,所设计的曲率连续无吸力峰前缘在任意工况总可以消除吸力面或压力面近前缘的吸力峰,从而使得叶表附面层的起始状态优于其它前缘叶型,因此气动性能要更好。
The numerical simulation method was used to study the influence of arc-shaped, elliptical and curvature continuous non-suction peak front on the development of leaf-type laminates. Through the extraction of parameters of leaf surface overlay under different conditions and the change of leaf surface overlay velocities, it is found that the effect of leading edge suction on leaf performance is that the suction peak affects the initial development of the surface layer. The spike of the leading suction peak is too strong, which leads to the deterioration of the initial development of the stratum, causing the stratosphere to turn early and even the detachment of the blister. The surface layer of the leaf surface is thickened rapidly and the loss of the leaf type increases. Angle of attack decreases. The study also shows that the design of the curvature of the continuous non-suction peak front edge in any condition can always eliminate the suction surface or the pressure near the front edge of the suction peak, making the surface of the leaf surface topography better than other leading edge type , So the aerodynamic performance should be better.