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The Air Force Institute of Technology and the AFRL are
investigating means to increase the efficiency of fuel-air mixing
into supersonic flow. Previous work has shown much promise in
increasing the penetration and mixing of a fuel-air mixture into
the freestream by injecting fuel behind small triangular pylons.
Pylon-aided fuel injection has also shown to lift the fuel plume
off the combustor floor; this floor-gap prevents the ignition of
fuel seeded in the boundary layer. In this paper twenty-one pylons
of varying widths, heights, and lengths were examined in four
specific test matrices within a CFD environment. Pylons in test
matrix 1 maintained a constant height and length while varying the
pylon width. Test matrix 2 and 3 varied the absolute height of two
different pylons from test matrix 1; scaling the pylons height and
maintaining a constant leading edge wedge angle and width to height
ratio. The final test matrix varied the length of pylons while
keeping the height and width fixed. Pylons with a width less than
3-diameters featured a fuel plume dominated by two sets of
counter-rotating vortices.
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