Oscillating shock wave boundary layer interactions on a cantilever plate
Murali Krishna Talluru, Liam P. McQuellin, Andrew Neely
Abstract
Experimental results for an oscillating shock-wave boundary-layer interaction on a compliant cantilever plate are reported here. The experimental model is tested in a Ludwieg tube facility, operating in free-piston compression-heating mode, at a free-stream Mach number of 5.8. The shock generator is a two-dimensional triangular wedge, which is free to pitch between -5$\degree$ and 5$\degree$ angle-of-attack, resulting in an included angle range of 0$\degree$ to 10$\degree$, and oscillates at a natural frequency of 42\,Hz. The cantilever plate has a fundamental frequency of 84\,Hz, and is excited by the shock generated by the oscillating shock generator. Pressure measurements at the trailing edge of the cantilever plate reveal a fluid-structure coupling, which is further corroborated by the trailing edge displacement history of the cantilever plate. Our analysis indicate that there is a strong forcing of the compliant plate due to the dynamic shock-wave boundary-layer interaction induced by the oscillating shock generator that is excited by the hypersonic freestream flow.