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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

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

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v3.i1.60
pages 79-90

FLOW VISUALIZATION OF FOUR-INLET DUCTED ROCKET ENGINE CONFIGURATIONS

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

ABSTRAKT

A water flow visualization facility was constructed in order to investigate the mixing processes inside of four-inlet ducted rocket engines (DRE) with various flow rates and geometries. The observed flow fields were documented with video and conventional photography so that relationships between various geometric/flow parameters and the flow field behavior could be obtained. Flow visualization was achieved by seeding the flow field with polystyrene spheres and illuminating them with laser sheet lighting. Images revealed complex mixing patterns within the dome head region of the combustors that exhibited a strong dependence on dome height, momentum ratios, and inlet flow angles. For large inlet flow angles on the same-station combustors, it was shown that the geometries intrinsically direct a significant portion of the inlet flow toward the dome head region without the need for diverter devices. The resulting dome-region flow field contains two distinct recirculation patterns shown to be dependent on the momentum ratio and inlet flow inlet angle. These parameters also strongly affect the existence and strength of transport mechanisms between the fore and aft combustor segments. By designing a combustor accordingly, it may be possible to take advantage of one or both of the operating conditions resulting in a combustor with improved combustion properties.


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