Hsu, KY
1992
Investigation of the Combustion Characteristics of a Swirled Injector in a Confined Coannular System with a Sudden Expansion
Warren, D.; Pyper, D.K.; Blackham, S.; Christensen, J.; Hedman, P.O.; Goss, L.P.; Trump, D.; Sarka, B.; Hsu, K.Y. and Roquemore, W.M.
Fall Meeting of the Western States Section/The Combustion Institute, Berkeley, CA, October 1992. Funded by Wright-Patterson Air Force Base and Air Force Office of Scientific Research.
This paper presents preliminary results of an Air Force Office of Scientific Research (AFOSR) program being conducted at Brigham Young University (BYU), Provo, Utah and at Wright-Patterson Air Force Base (WPAFB) under Summer Faculty and Research Initiation Programs. This study is part of an extensive research effort being carried out by the Fuels Combustion Group of the Aero Propulsion and Power Laboratory at Wright Patterson Air Force Base (APPL, WPAFB), Dayton, Ohio, in which simple and complex diffusion flames are being studied to better understand the fundamentals of gas turbine combustion. The program's long-term goal is to improve the design methodology of gas turbine combustors.
The work at BYU is being accomplished by the systematic study of a geometrically simple burner "designed and developed to specifically reproduce recirculation patterns and lean blow out (LBO) processes that occur in a real gas turbine combustor" (Sturgess, et al., 1990). There are two configurations used in the burner. The Task 100 burner uses a central fuel tube surrounded by a concentric air jet with a step expansion at the plane of discharge. The Task 150 burner has replaced the central fuel and air tubes with a double swirler injector from an actual Pratt-Whitney jet engine. Both configurations have been designed to be nearly axisymmetric and incorporate quartz windows to allow laser diagnostics. The burner is currently fueled by propane.
This paper contains a brief summary of work done at BYU and at Wright-Patterson Air Force base during the AFOSR summer faculty research programs. Intriguing flame structures have been visually characterized and captured in both still and video images with both the Task 100 and Task 150 configurations. Additional images of the flame and flow structures have been taken with laser sheet lighting, including Mie scattering and OH- florescence. These two-dimensional laser images have frozen structures missed with the visual observations due to the integrating nature of the eye and camera. LDA velocity maps have been collected over a variety of conditions, ranging from the relatively simple flow of the Task 150. This information not only yields velocity and turbulence data but will be used to obtain streamline functions as well. Both isothermal flow and combusting hot flow data have been collected. Limited CARS temperature data is compared in the paper LDA velocity maps and LIF image of OH-. Additional CARS temperature data are currently being collected at the test conditions of the LDA measurements and OH- images.
Hsu, KY
1992
Investigation of the Combustion Characteristics of a Swirled Injector in a Confined Coannular System with a Sudden Expansion
Warren, D.; Pyper, D.K.; Blackham, S.; Christensen, J.; Hedman, P.O.; Goss, L.P.; Trump, D.; Sarka, B.; Hsu, K.Y. and Roquemore, W.M.
Fall Meeting of the Western States Section/The Combustion Institute, Berkeley, CA, October 1992. Funded by Wright-Patterson Air Force Base and Air Force Office of Scientific Research.
This paper presents preliminary results of an Air Force Office of Scientific Research (AFOSR) program being conducted at Brigham Young University (BYU), Provo, Utah and at Wright-Patterson Air Force Base (WPAFB) under Summer Faculty and Research Initiation Programs. This study is part of an extensive research effort being carried out by the Fuels Combustion Group of the Aero Propulsion and Power Laboratory at Wright Patterson Air Force Base (APPL, WPAFB), Dayton, Ohio, in which simple and complex diffusion flames are being studied to better understand the fundamentals of gas turbine combustion. The program's long-term goal is to improve the design methodology of gas turbine combustors.
The work at BYU is being accomplished by the systematic study of a geometrically simple burner "designed and developed to specifically reproduce recirculation patterns and lean blow out (LBO) processes that occur in a real gas turbine combustor" (Sturgess, et al., 1990). There are two configurations used in the burner. The Task 100 burner uses a central fuel tube surrounded by a concentric air jet with a step expansion at the plane of discharge. The Task 150 burner has replaced the central fuel and air tubes with a double swirler injector from an actual Pratt-Whitney jet engine. Both configurations have been designed to be nearly axisymmetric and incorporate quartz windows to allow laser diagnostics. The burner is currently fueled by propane.
This paper contains a brief summary of work done at BYU and at Wright-Patterson Air Force base during the AFOSR summer faculty research programs. Intriguing flame structures have been visually characterized and captured in both still and video images with both the Task 100 and Task 150 configurations. Additional images of the flame and flow structures have been taken with laser sheet lighting, including Mie scattering and OH- florescence. These two-dimensional laser images have frozen structures missed with the visual observations due to the integrating nature of the eye and camera. LDA velocity maps have been collected over a variety of conditions, ranging from the relatively simple flow of the Task 150. This information not only yields velocity and turbulence data but will be used to obtain streamline functions as well. Both isothermal flow and combusting hot flow data have been collected. Limited CARS temperature data is compared in the paper LDA velocity maps and LIF image of OH-. Additional CARS temperature data are currently being collected at the test conditions of the LDA measurements and OH- images.