Abstract
In order to obtain a good quality i.e. parallel and uniform flow in the test section of the High Enthalpy Shock Tunnel Gottingen (HEG) the facility was equiped with an axisymmetric contoured nozzle. The nozzle flow was investigated numerically at an off-design condition using nitrogen as test gas. Numerical simulations assuming the flow to be either in chemical/thermal equilibrium or in chemical/thermal nonequilibrium were carried out. For the case of chemical/thermal equilibrium a ‘turbulent’ simulation was additionally performed. The development of the turbulent boundary layer along the nozzle wall was compared with the predictions of the Edenfield correlation. The Pitot pressure at the nozzle exit resulting from the ‘turbulent’ simulation was compared with Pitot-rake measurements taken in HEG. Additional to the nozzle simulations numerical simulations of shock-on-shock interactions, created when an oblique shock impinges on a bow shock formed in front of a circular cylinder were performed to accompany experiments in HEG. To study the basic influence of dissociation, nitrogen has also been used as test gas for these investigations.
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