OH-PLIF visualisation of radical farming supersonic combustion flows |
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Authors: | R R Boyce N R Mudford J R McGuire |
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Institution: | 1. Centre for Hypersonics, The University of Queensland, Brisbane, 4072, Australia 2. School of Engineering and Information Technology, University of New South Wales, Australian Defence Force Academy, Canberra, 2600, Australia 3. NOVA Defence, Brisbane, Australia
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Abstract: | Experimental investigations employing Planar Laser-induced fluorescence visualisation of the qualitative distribution of the
OH radical (OH-PLIF), coupled with surface pressure measurements, have been made of flow in a generic, nominally two-dimensional
inlet-injection radical farming supersonic combustion scramjet engine model. The test flows were provided by a hypersonic
shock tunnel, and covered total enthalpies corresponding to the flight Mach number range 8.7–11.8 and approximately 150 kPa
dynamic pressure. The surface pressure measurements displayed radical farming behaviour, that is a series of adjacent high
and low pressure regions corresponding to successive shock/expansion structures, with no significant combustion-induced pressure
rise until the second structure. OH-PLIF imaging between the first two structures provides the first direct experimental evidence
of significant OH radical concentrations upstream of the ignition point in this mode of scramjet operation and shows that
combustion reactions were occurring in highly localised regions in a complex turbulent and poorly micromixed fuel/air mixing
layer confined to the fuel injection side of the combustor. |
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