Investigation of an overlap of heating peaks in the hypersonic boundary layer over a blunt cone
Zhenghao Feng, Chong Cai, Cunbiao Lee, Daoning Yang
Abstract
In this Letter, we report a phenomenon where two overlapping heating peaks are observed over a slightly blunted cone instead of just one in a hypersonic flow. Through optical measurements and direct numerical simulations, we confirm that the former peak originates from dilatational effects of second mode while the latter emerges due to high shear viscous dissipation. The convergence between the saturation location of second mode and onset location of transition leads to the overlap of peaks. This study not only highlights the additional heating regions over blunt models brought by the second mode, but also suggests employing designed bluntness strategies to control them.
Topics & Concepts
Hypersonic speedCone (formal languages)Boundary layerBluntAngle of attackLayer (electronics)Materials scienceMechanicsAerospace engineeringPhysicsMathematicsComposite materialEngineeringAerodynamicsAlgorithmPolymer chemistryFluid Dynamics and Turbulent FlowsComputational Fluid Dynamics and AerodynamicsWind and Air Flow Studies