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Proposing Institution

Lehrstuhl für Aerodynamik, TU München
Project Manager

PD Dr.-Ing. habil. Christian Stemmer
Boltzmannstraße 15
85748 Garching
In the proposed project, direct numerical simulations are used to investigate the laminar-turbulent transition evolution in a high-enthalpy flow under chemical equilibrium andnon-equilibrium conditions. A generic geometry of the Apollo-capsule shape is used including high-temperature gas effects. The effects of dissociation and non-equilibriumon the disturbance development in the boundary layer subject to instabilities shall beinvestigated. Especially, roughness-induced transition under chemical equilibrium andnon-equilibrium conditions as for atmospheric re-entry missions is the main focus of theinvestigation. Disturbance amplification through the so-called transient growth mechanism as well as secondary instability mechanisms in the wake of distributed roughnessare examined. Secondary instabilities are driven by local velocity and temperature gradients, which can be more pronounced in chemical (non-)equilibrium flows, leading to earliertransition in these cases. In addition, simulations under cold wind-tunnel conditions areplanned to better predict transition in corresponding experiments. Extrapolation of theseresults to high-enthalpy free-flight conditions are of particular interest.

Impressum, Conny Wendler