超声速边界层转捩实验可控扰动的引入方法

通过数值模拟的方法,研究了在二维平板超声速边界层中,由壁面处安装的激振薄膜引入的扰动的演化过程.主要得到了如下结论:由激振薄膜引入的扰动能很快演化成标准的T-S波,但扰动的各物理量的演化为T-S波的速度并不相同,即各物理量并不同时形成T-S波,速度最先形成,而温度最晚.在相同的条件下,由不同激振形式或不同宽度的薄膜引入的扰动的演化速度基本相同.

The way to introduce controlled disturbance into supersonic boundary-layer in transition experiments

Numerical simulation was used to investigate the evolution of the disturbances in a supersonic boundary layer introduced by a vibrating membrane mounted on the wall. The main conclusions were: The disturbance induced by the membrane soon evolved to be a pure T-S waves. However, different components of the wave did not evolve with the same rate, i.e. they did not form T-S waves simultaneously, the velocity became T-S wave first, while the temperature was the last to became a pure T-S wave. Under the same condition, disturbances introduced by membranes with different form or different width evolved to become a pure T-S wave with almost the same rate.