Simulation of unsteady hypersonic combustion around projectiles in an expansion tube |
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Authors: | S Yungster K Radhakrishnan |
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Institution: | (1) Institute for Computational Mechanics in Propulsion, NASA Glenn Research Center, MS 86/6, Cleveland, OH 44135, USA , US |
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Abstract: | The temporal evolution of combustion flowfields established by the interaction between wedge-shaped bodies and explosive
hydrogen-oxygen-nitrogen mixtures accelerated to hypersonic speeds in an expansion tube is investigated. The analysis is carried
out using a fully implicit, time-accurate, computational fluid dynamics code that we recently developed to solve the Navier-Stokes
equations for a chemically reacting gas mixture. The numerical results are compared with experimental data from the Stanford
University expansion tube for two different gas mixtures at Mach numbers of 4.2 and 5.2. The experimental work showed that
flow unstart occurred for both the Mach 4.2 cases. These results are reproduced by our numerical simulations and, more significantly,
the causes for unstart are explained. For the Mach 5.2 mixtures, the experiments and numerical simulations both produced stable
combustion. However, the computations indicate that in one case the experimental data were obtained during the transient phase
of the flow; that is, before steady state had been attained.
Received 7 February 2000/ Accepted 20 February 2001 |
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Keywords: | : Oblique detonation wave Chemically reacting flow TVD and BDF numerical schemes |
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