基于线性稳定性理论的转捩控制试验

 使用线化稳定性理论研究了某后掠机翼试验模型在风洞试验条件下可能的试验结果。在当前试验条件下，三维边界层中横流驻波的不同波长扰动发展趋势不同，根据理论分析和数值计算给出了最大放大率波长为4.0 mm。通过升华法试验验证了理论分析与数值计算结果。在试验中使用丝网印刷技术在后掠机翼前缘添加粗糙带，成功地引入了理论计算的最大放大率波长。根据预期影响了三维边界层的转捩。

Transition Control Experiment Based on Linear Stability Theory

This article investigates the experimental results of a swept-wing model in a wind tunnel by means of the linear stability theory. It is discovered that different wavelengths of the crossflow stationary waves in the 3D boundary layer exhibite different evolutionary trends of disturbance. The largest amplificatory wavelength in this experimental situation, found through analysis and numerical calculation, is 4.O mm, which is validated by Naphthalene visualization. This wavelength is successfully introduced to the leading edge of the swept-wing by an artificial roughness area created by the silk-screen technique, which affectes the 3D boundary layer transition just as predicted.