The current study investigates means to increase the efficiency of fuel-air mixing into supersonic flow upstream of a flame holding cavity. 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. The current paper examines 21 triangular pylons of varying widths, heights, and lengths with a computational fluid dynamics (CFD) performance analysis. Increasing the height of the pylons increased the penetration, flammable fuel plume area, and floor gap. Variations in pylon length had no discernible impact on the fuel-air mixing metrics. Aerodynamic loses were minimal for all pylon configurations and did not correlate to the absolute size of the pylons tested.
Parametric Analysis of Pylon-Aided Fuel Injection in Scramjet Engines
Air Force SEEK EAGLE Office,
Carriage Mechanics Division,
Eglin AFB, FL 32542
Department of Aeronautics and Astronautics,
Air Force Institute of Technology,
Wright-Patterson AFB, OH 45433
Contributed by the Aircraft Engine Committee of ASME for publication in the Journal of Engineering for Gas Turbines and Power. Manuscript received April 16, 2012; final manuscript received September 11, 2012; published online January 8, 2013. Editor: Dilip R. Ballal.
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Pohlman, M. R., and Greendyke, R. B. (January 8, 2013). "Parametric Analysis of Pylon-Aided Fuel Injection in Scramjet Engines." ASME. J. Eng. Gas Turbines Power. February 2013; 135(2): 024501. https://doi.org/10.1115/1.4007735
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