Shouse, DT
1994
Observations of Flame Behavior from a Practical Fuel Injector Using Gaseous Fuel in a Technolgoy Combustor
Hedman, P.O.; Sturgess, G.J.; Warren, D.L.; Goss, L.P. and Shouse, D.T.
Transactions of the ASME, 1994 (in press). (Also presented at the ASME International Gas Turbine and Aeroengine Congress and Exposition, The Hague, Netherlands, June 1994. Funded by ACERC, Wright Patterson Air Force Base and Air Force Office of Scientific Research.
This paper presents results from an Air Force program being conducted by researchers at Brigham Young University (BYU), Wright-Patterson Air Force Base (WPAFB), and Pratt and Whitney Aircraft Co. (P&W). This study is part of a comprehensive effort being supported by the Aero Propulsion and Power Laboratory at Wright-Patterson Air Force Base, and Pratt and Whitney, Inc. in which simple and complex diffusion flames are being studied to better understand the fundamentals of gas turbine combustion near lean blowout. The program's long-term goal is to improve the design methodology of gas turbine combustors.
This paper focuses on four areas of investigation: 1) digitized images from still film photographs to document the observed flame structures as fuel equivalence ratio was varied, 2) sets of LDA data to quantify the velocity flow fields existing in the burner, 3) CARS measurements of gas temperature to determine the temperature field in the combustion zone, and to evaluate the magnitude of peak temperature, and 4) two-dimensional images of OH radical concentrations using PLIF to document the instantaneous location of the flame reaction zones.
Aspects of Flame Stability in a Research Dump Combustor
Sturgess, G.J.; Hedman, P.O.; Sloan, D.G. and Shouse, D.T.
Transactions of the ASME, 1994 (in press). (Also presented at the ASME International Gas Turbine and Aeroengine Congress and Exposition, The Hague, Netherlands, June 1994. Funded by ACERC, Wright Patterson Air Force Base and Air Force Office of Scientific Research.
The lean blowout process is studied in a simplified, nominally diffusion flame, research combustor that incorporates the essential features of the combustor primary zone for an aircraft gas turbine engine. The research combustor is provided with extensive optical access. To investigate the blowout, a variety of diagnostic techniques are employed, including direct flame observation, laser-Doppler anemometry, spontaneous OH-imaging, thin-filament pyrometry, laser-induced fluorescence OH imaging, coherent anti-Stokes Raman spectroscopy, and computational fluid dynamics. Lean blowouts in the research combustor are related to well-stirred reactor blowout. A blowout sequence is found to be initiated by the loss of a key flame structure in the form of an attached pilot flame. The behavior of this attached flame is investigated. It is concluded that a major contribution to the existence of the attached flame is near-field, non-stationary radial transport of reactants directly into the recirculation zone, rather than by mean flow recirculation of hot products. "Lift" of the attached flame is the reason that lean blowout in the research combustor is related to well-stirred reactor blowout since it allows at least partial premixing of reactants to take place.
Shouse, DT
1994
Observations of Flame Behavior from a Practical Fuel Injector Using Gaseous Fuel in a Technolgoy Combustor
Hedman, P.O.; Sturgess, G.J.; Warren, D.L.; Goss, L.P. and Shouse, D.T.
Transactions of the ASME, 1994 (in press). (Also presented at the ASME International Gas Turbine and Aeroengine Congress and Exposition, The Hague, Netherlands, June 1994. Funded by ACERC, Wright Patterson Air Force Base and Air Force Office of Scientific Research.
This paper presents results from an Air Force program being conducted by researchers at Brigham Young University (BYU), Wright-Patterson Air Force Base (WPAFB), and Pratt and Whitney Aircraft Co. (P&W). This study is part of a comprehensive effort being supported by the Aero Propulsion and Power Laboratory at Wright-Patterson Air Force Base, and Pratt and Whitney, Inc. in which simple and complex diffusion flames are being studied to better understand the fundamentals of gas turbine combustion near lean blowout. The program's long-term goal is to improve the design methodology of gas turbine combustors.
This paper focuses on four areas of investigation: 1) digitized images from still film photographs to document the observed flame structures as fuel equivalence ratio was varied, 2) sets of LDA data to quantify the velocity flow fields existing in the burner, 3) CARS measurements of gas temperature to determine the temperature field in the combustion zone, and to evaluate the magnitude of peak temperature, and 4) two-dimensional images of OH radical concentrations using PLIF to document the instantaneous location of the flame reaction zones.
Aspects of Flame Stability in a Research Dump Combustor
Sturgess, G.J.; Hedman, P.O.; Sloan, D.G. and Shouse, D.T.
Transactions of the ASME, 1994 (in press). (Also presented at the ASME International Gas Turbine and Aeroengine Congress and Exposition, The Hague, Netherlands, June 1994. Funded by ACERC, Wright Patterson Air Force Base and Air Force Office of Scientific Research.
The lean blowout process is studied in a simplified, nominally diffusion flame, research combustor that incorporates the essential features of the combustor primary zone for an aircraft gas turbine engine. The research combustor is provided with extensive optical access. To investigate the blowout, a variety of diagnostic techniques are employed, including direct flame observation, laser-Doppler anemometry, spontaneous OH-imaging, thin-filament pyrometry, laser-induced fluorescence OH imaging, coherent anti-Stokes Raman spectroscopy, and computational fluid dynamics. Lean blowouts in the research combustor are related to well-stirred reactor blowout. A blowout sequence is found to be initiated by the loss of a key flame structure in the form of an attached pilot flame. The behavior of this attached flame is investigated. It is concluded that a major contribution to the existence of the attached flame is near-field, non-stationary radial transport of reactants directly into the recirculation zone, rather than by mean flow recirculation of hot products. "Lift" of the attached flame is the reason that lean blowout in the research combustor is related to well-stirred reactor blowout since it allows at least partial premixing of reactants to take place.