Some challenging studies on shockwave boundary layer interactions using advanced flow diagnostics

Abstract

Those working in the field of diagnostics continuously find new ways to visualise and quantify complicated flows in ways that were probably at some time thought to be impractical. These include either optimisation of already wellestablished techniques such as Schlieren with the development of higher resolution and faster cameras, or the invention of new methods by the synergy between different disciplines, such as pressure sensitive paints which bring together physics, chemistry and fluids. Ideally most of these diagnostic methods have a low parasitic profile or are completely non-intrusive. The present article paper gives a brief overview of some challenging investigations on shock boundary layer interactions using these flow diagnostic methods. A case study on axisymmetric transitional interactions at Mach 5 is also presented.