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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.5

ISSN Print: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v6.i1.20
pages 19-32

AN INVESTIGATION OF FOUR-INLET DUCTED ROCKET ENGINE FLAMEHOLDER FUEL DISTRIBUTIONS

Christopher M. Brophy
Department of Aeronautics and Astronautics, Naval Postgraduate School, Monterey, California 93943
Clark W. Hawk
Propulsion Research Center, Department of Mechanical and Aerospace Engineering, University of Alabama in Huntsville, Huntsville, Alabama 35899

ABSTRACT

Fuel concentrations existing in the flameholding region of a four-inlet ducted rocket engine with a five-orifice showerhead fuel injector have been evaluated for a range of flow rates and fuel injector orientations. Methane was used as the fuel simulant for the solid gas generator, and vibrational-Raman spectroscopy was used to image the methane distribution in the dome head region of an optically accessible four-inlet combustor. A fuel injector orientation that produced a fuel distribution and internal flow field desensitized to the air/fuel momentum ratio was found.
Observations made during the cold gas mixing study agreed well with conclusions from previous water flow visualization studies that investigated the internal flow fields of similar fuel injector orientations and combustor geometries.


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