381 RWTH Publication No: 230422        2014        IGPM381.pdf
TITLE Investigation of the Unsteady Edney Type IV and VII Shock–Shock Interaction
AUTHORS Christian Windisch, Birgit Reinartz, Siegfried Müller
ABSTRACT Edney type IV and type VII shock-shock interactions are complex hypersonic flow phe- nomena. They are characterized by a supersonic jet which reaches far into the flow field. An experimental investigation of the inner jet structure is difficult, especially in cases where the jet is subject to high-frequency unsteady movements. The present paper pro- vides insight into the jet structure by means of a highly-resolved Computational Fluid Dynamics analysis in thermochemical nonequilibrium. Simulations of an Edney type IV interaction in nitrogen flow are presented. Multiple resolution levels support the identifi- cation and analysis of the mechanisms of the jet unsteadiness. The second configuration is an Edney type VII interaction. This shock-shock interaction type was observed and defined in nitrogen flow by Yamamoto et al. The present results demonstrate that this interaction may also be observed in CO2 -dominated flow with a gas composition similar to the Martian atmosphere. The results provide insight into the jet structure of this less known interaction.
KEYWORDS Hypersonic flows, shock-shock interaction, grid adaptation, thermochemical nonequilibrium
DOI 10.2514/1.J054298
Vol. 54, No. 6 (2016), pp. 1846-1861