翼面几何不规则性对压力分布影响的数值模拟研究

通过求解二维雷诺平均Navier-Stokes方程(RANS)及SST k-ω二方程湍流模型,数值模拟表面存在几何不规则的突起物或凹坑的翼型绕流。分析对比了不同位置处多种类型的突起物和凹坑在不同的高度下对翼型压力分布、激波位置的影响。对翼型测压实验中所出现的压力跳动给出了一种解释,有助于指导风洞实验,提高实验精度,并对实验数据进行合理的修正。

Numerical Simulation Study of the Effects of Airfoil Surface Geometric Irregularity on Pressure Distribution

Two-dimensional Reynolds averaged Navier-Stokes equations with SST turbulence model equations are solved for the flow field around airfoils with burrs (protuberances or grooves) or roughness tapes on to study the effects of the geometric irregularity on pressure distribution. Comparisons between different burrs (i.e., different shapes of protuberances, grooves) are made with respect to their effects on the airfoil surface pressure distribution. The influence of roughness, the heights of burrs, and the position of the burrs on the pressure distribution are also investigated. An explanation is given to the pressure jump over the burrs (protuberances, grooves) or roughness on the airfoil surface. This is helpful to guide the pressure measurement experiments, to improve the experimental accuracy, and to give a reasonable correction of the test data. A roughness height for fixed transition on airfoil tests is suggested.