Experimental Investigation of a Lean, Premixed Gas Turbine Combustor Using Advanced Laser Diagnostics
Foglesong, Robert Edwin
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https://hdl.handle.net/2142/83762
Description
Title
Experimental Investigation of a Lean, Premixed Gas Turbine Combustor Using Advanced Laser Diagnostics
Author(s)
Foglesong, Robert Edwin
Issue Date
2001
Doctoral Committee Chair(s)
Lucht, Robert P.
Department of Study
Mechanical Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Mechanical
Language
eng
Abstract
Flame structure and stabilization were studied using planar laser-induced fluorescence of the hydroxyl radical. Four operating conditions were examined---two equivalence ratios, 0.6 and 0.7, and two combustor pressure drops, 3% and 5%. Time-resolved images were acquired at two axial locations for each test condition, revealing a combustion flow field dominated by large-scale turbulent structures. Stabilization of the flame occurred primarily in the side recirculation zone at the edge of the premixer exit. Single-shot temperature measurements were made using coherent anti-Stokes Raman scattering at the two pressure drop conditions with an equivalence ratio of 0.7. Time-resolved measurements were made at twenty spatial locations at each condition. Temperatures were below those expected based on previous cold-flow mixing investigations that revealed fuel-rich mixtures in the reaction zone of the combustor. Emissions measurements demonstrated the correlation between equivalence ratio and NO x generation, but were generally low, indicating low levels of unmixedness.
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