Design of a rotor blade tip for the investigation of dynamic stall in the transonic wind-tunnel Göttingen
Design of a rotor blade tip for the investigation of dynamic stall in the transonic wind-tunnel Göttingen
复制标题
用于研究哥廷根跨音速风洞动态失速的转子叶尖设计
作者：
B. Lütke;J. Nuhn;Y. Govers;M. Schmidt
介绍了一种双掠型俯仰叶尖的气动与结构设计。作者演示了高保真有限元（FE）和计算流体动力学（CFD）模拟如何成功地应用于设计阶段。特征频率、变形和应力分布通过三维（3D）有限元模型进行评估。将非定常雷诺数-平均纳维-斯托克斯（RANS）模拟结果与Ma = 0.5、Re = 1.2 × 106的轻动态失速情况下的实验数据进行了比较。结果表明，只要流体保持附著状态，结果就非常吻合。捕获了跨方向分离位置的趋势。一旦分离开始，就会观察到实验数据和数值数据之间的差异。实验数据表明，对于Ma = 0.5的轻动态失速情况，采用所提出的仿真方法，FoS = 2.0的安全系数是足够的。
ABSTRACT The aerodynamic and structural design of a pitching blade tip with a double-swept planform is presented. The authors demonstrate how high-fidelity finite element (FE) and computational fluid dynamic (CFD) simulations are successfully used in the design phase. Eigenfrequencies, deformation, and stress distributions are evaluated by means of a three-dimensional (3D) FE model. Unsteady Reynolds-averaged Navier-Stokes (RANS) simulations are compared to experimental data for a light dynamic stall case at Ma = 0.5, Re = 1.2 × 106. The results show a very good agreement as long as the flow stays attached. Tendencies for the span-wise location of separation are captured. As soon as separation sets in, discrepancies between experimental and numerical data are observed. The experimental data show that for light dynamic stall cases at Ma = 0.5, a factor of safety of FoS = 2.0 is sufficient if the presented simulation methods are used.