Technical Briefs

Parametric Analysis of Pylon-Aided Fuel Injection in Scramjet Engines

[+] Author and Article Information
Mitchell R. Pohlman

Flutter Flight Test Team Lead
Air Force SEEK EAGLE Office,
Carriage Mechanics Division,
205 West D Ave.,
Eglin AFB, FL 32542

Robert B. Greendyke

Associate Professor
Department of Aeronautics and Astronautics,
Air Force Institute of Technology,
2950 Hobson Way,
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.

J. Eng. Gas Turbines Power 135(2), 024501 (Jan 08, 2013) (5 pages) Paper No: GTP-12-1103; doi: 10.1115/1.4007735 History: Received April 16, 2012; Revised September 11, 2012

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.

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Grahic Jump Location
Fig. 1

Flowfield geometries: (a) computational domain schematic, (b) AFRL designed cavity dimensions, and (c) pylon and injection port geometry

Grahic Jump Location
Fig. 2

(a) Side view of flow structure within the flame-holding cavity that distorts the fuel plume. (b) Iso-view of flow structure interaction between the flame-holding cavity and freestream including vector plot and contour plot at x/d = 60 location of LWH-7 × 1 × 4 pylon.

Grahic Jump Location
Fig. 3

Total penetration for the third test case matrix, representing variation in absolute pylon height for the LWH-7 × 2 × 4 pylon

Grahic Jump Location
Fig. 4

Comparison of species contour plot between computations and experiment of (a) Haubert baseline case, (b) Haubert pylon assisted case, and (c) Montes for pylon-aided normal fuel injection at x/d = 12



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