Abstract
A free-piston driven shock tunnel, operating in the non-reflected mode, was used to obtain a strongly dissociating flow of pure nitrogen (Mach 5.66) over a blunt nosed body, 65 mm long. The flow speed is approximately 6 km/s and the Damkohler number of O(1) indicates that the flow is in chemical non-equilibrium. The useful test time is shorter than for conventional shock tunnel operation but the prior-steady-flow technique has been used to establish a fully developed flow. Interferograms of the afterbody flow have been made and compared with results obtained from a finite volume (kinetic theory based) CFD method the Equilibrium Flux Method for chemically reacting flows. The results show good agreement between experiments and computations. The experiments were perfomed in the T3 shock tunnel at the Australian National University. [For more details of the CFD method see M N Macrossan J Comput Physics v80, p204 1989. For more details of the flow and the experiments see M N Macrossan J Fluid Mechanics v207, p167 1990].
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