Single-Laser Krypton Tagging Velocimetry Investigation of Supersonic Air and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:msub><mml:mi mathvariant="normal">N</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math> Boundary-Layer Flows over a Hollow Cylinder in a Shock Tube

Abstract

The titular technique, KTV, is an important development in the field of laser diagnostics for supersonic and hypersonic flows, as it gives access to unexplored regimes. KTV is not plagued by the fundamental limitations of traditional tracer-particle techniques. The authors investigate the boundary-layer profiles that form over a sharp, hollow cylinder in supersonic flows of air and N${}_{2}$ via a single-laser scheme. With the use of high-repetition-rate lasers, this simple, cost-effective evaluation tool for large facilities will allow for time-resolved measurements of turbulent flows, for $e.g.$ the development of high-speed vehicles such as bullet trains.