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Effects of Passive Fuel-Air Mixing Control on Burner Emissions Via Lobed Fuel InjectorsThe present experimental study examines the effects of differing levels of passive fuel-air premixing on flame structures and their associated NO(x) and CO emissions. Four alternative fuel injector geometries were explored, three of which have lobed shapes. These lobed injectors mix fuel and air and strain species inter-faces to differing extents due to streamwise vorticity generation, thus creating different local or core equivalence ratios within flow regions upstream of flame ignition and stabilization. Prior experimental studies of two of these lobed injector flowfields focused on non-reactive mixing characteristics and emissions measurements for the case where air speeds were matched above and below the fuel injector, effectively generating stronger streamwise vorticity than spanwise vorticity. The present studies examine the effects of airstream mismatch (and hence additional spanwise vorticity generation), effects of confinement of the crossflow to reduce the local equivalence ratio, and the effects of altering the geometry and position of the flameholders. NO(x) and CO emissions as well as planar laser-induced fluorescence imaging (PLIF) of seeded acetone are used to characterize injector performance and reactive flow evolution.
Document ID
Document Type
Reprint (Version printed in journal)
Mitchell, M. G.
(California Univ. Los Angeles, CA United States)
Smith, O. I.
(California Univ. Los Angeles, CA United States)
Karagozian, A. R.
(California Univ. Los Angeles, CA United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1999
Subject Category
Inorganic And Physical Chemistry
Report/Patent Number
AIAA Paper 99-2400
Meeting Information
Meeting: Joint Propulsion
Location: Los Angeles, CA
Country: United States
Start Date: June 20, 1999
End Date: June 24, 1999
Sponsors: American Society of Mechanical Engineers, American Inst. of Aeronautics and Astronautics, American Society for Electrical Engineers, Society of Automotive Engineers, Inc.
Funding Number(s)
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