Nonequilibrium nozzle flow of a nitrogen-hydrogen mixture

Computer Science – Numerical Analysis

Scientific paper

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Gas Mixtures, Hydrogen, Nitrogen, Nonequilibrium Flow, Nozzle Flow, Atmospheric Entry, Bow Waves, Enthalpy, Oblique Shock Waves, Stagnation Flow, Titan

Scientific paper

High enthalpy nitrogen-hydrogen nozzle flows are of interest for two reasons. First, entry into the Titan atmosphere will require hypervelocity flight in nitrogen-hydrogen mixtures, and second, the high recombination rate of dissociated hydrogen suggests that significant 'freezing' of the nozzle gases may be delayed to high stagnation enthalpies, which would be advantageous for studies of real gas effects in hypervelocity flow. A 50% N2-50% H2 mixture was investigated with emphasis on the second aspect. Numerical analysis was performed on the nozzle expansion flow, and experiments were performed in a small free-piston shock tunnel, where the oblique shock formed on a symmetrical two-dimensional wedge and the bow shock on a circular cylinder transverse to the stream were visualized by means of spark schlieren photography.

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