临近空间螺旋桨低雷诺数高效翼型数值分析

针对临近空间翼型边界层变厚更容易发生分离的特点,在修正了湍流模型后,通过分析比较13种低雷诺数翼型的升阻系数得到了比较适合用于临近空间螺旋桨叶素的高效翼型。结果显示,攻角在-6°～8°、8°～14°、14°～22°三种工况下,分别采用SST k-ω、RNG k-ε、Realizable k-ε湍流模型,可以得到与国外实验比较接近的合理结果;工况条件对翼型气动性能好坏的影响很大,翼型S-1223和FX63-137在所研究的工况内都具有较好的气动性能;因此可以选择这两种翼型作为临近空间螺旋桨用高效翼型。

Numerical Analisis of Low Reynolds Efficient Airfoil in Propeller in Near Space

The airfoils suit for screw propeller blade element in near space has been chosen by the comparing analyze the lift-drag coefficient of 13 low Re airfoils based on numerical study.The process of boundary layer flow separation will expedite in near space and the turbulence model has been correction for the thick boundary layer.The results shows that,the reasonable numerical results will be obtained by the SST k-ω,RNG k-ε,Realizable k-ε turbulence model in-6°～8°,8°～14°,14°～22° working condition,respectively.The aerodynamic characteristic of the airfoils will change when the working condition change.The aerodynamic characteristic of the airfoil S-1223 and FX63-137 is great in all conditions of this paper,so the suitable airfoil for propeller blade element in near space is S-1223 or FX63-137.