曲率对机翼边界层二次失稳影响

The effect of curvature on the swept wing boundary layer secondary instability

摘要: 采用非线性抛物化扰动方程(NPSE)计算了层流机翼NLF0415(2)在几个工况下横流涡的非线性发展, 应用Floquet理论分析了横流涡的二次失稳. 较系统地分析了后掠机翼在多种参数下表面曲率对其流动稳定性的影响. Haynes证明曲率对于横流在线性稳定性计算(LST)和非线性抛物化扰动方程计算中(NPSE)都起着非常明显的稳定作用; 然而, 该文计算结果表明, 曲率在二次失稳计算中影响不大.

Abstract: Using the Parabolized Stability Equations (PSE), the nonlinearevolution of Stationary crossflow vortices over a swept NLF0415(2) airfoilis studied, then Floquet theory is employed to systematically study thedependence of the secondary, high-frequency instabilities on the curvatureat different conditions. Haynes (2000) shows that the curvature has astabilizing effect for linear stability theory and nonlinear ParabolizedStability Equations, and the results show that the curvature has no effectfor secondary linear stablity equations.