Volume 3, 2012Progress in Flight Physics
|Page(s)||267 - 276|
|Section||Chapter Three. High Enthalpy Flows|
|Published online||29 January 2013|
Chemical nonequilibrium effects in the wake of an obstacle in hypersonic boundary-layer flows
Lehrstuhl für Aerodynamik Technische Universität München Garching b. München D-85748, Germany
Various complex flow features occur in reentry scenarios. This paper aims to investigate the influence of chemical nonequilibrium effects on the wake of a cuboid obstacle, sized about half the boundary layer thickness, in hypersonic boundary layer flows. The geometry here was chosen according to NASA HyBoLT experiment as explained in , where the basic shape is a wedge with a half angle of 6°. The freestream flow was chosen to have atmospheric conditions at an altitude of 42.5 km and a Mach number of 8.5. Simulations were obtained with 3 different gas models, a caloric one, one assuming chemical equilibrium, and the last considering chemical nonequilibrium. Two-dimensional (2D) direct numerical simulation (DNS) was used over the whole domain to extract inflow profiles for three-dimensional (3D) DNS of a reduced domain.
© Owned by the authors, published by EDP Sciences, 2012