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3D-Printed Quasi-Random Distributed Roughness for Turbulent Boundary Layer Analysis on Hypersonic Ogive Nosecones

AIAA 2023-0660
Session: Hypersonic Aerodynamics II
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Quasi-random distributed roughness topologies were produced to transition the boundary layer over an axisymmetric tangent ogive nosecone in hypersonic flow. Surface roughness was accomplished by applying a cylindrical 2D Fourier series to the triangulated surface of the ogive nosetip in a manner that resembles sand grit roughness. In total, one smooth tip and three rough tips with varying roughness heights were 3D-printed to examine their effectiveness at boundary layer transition. The models were assessed with Infrared (IR) Thermography and Focused Laser Differential Interferometry (FLDI). Power spectral density results, together with 1D heat flux, demonstrated that the roughened nosetips led to decreased transitional and fully turbulent Reynolds numbers compared to the smooth tip geometry.