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Mhz-Rate Nitric Oxide Planar Laser-Induced Fluorescence Imaging In A Mach 10 Hypersonic Wind Tunnel, Naibo Jiang, Matthew Webster, Walter R. Lempert, Joseph D. Miller, Terrence R. Meyer, Christopher B. Ivey, Paul M. Danehy
Mhz-Rate Nitric Oxide Planar Laser-Induced Fluorescence Imaging In A Mach 10 Hypersonic Wind Tunnel, Naibo Jiang, Matthew Webster, Walter R. Lempert, Joseph D. Miller, Terrence R. Meyer, Christopher B. Ivey, Paul M. Danehy
Terrence R Meyer
Nitric oxide planar laser-induced fluorescence (NO PLIF) imaging at repetition rates as high as 1 MHz is demonstrated in the NASA Langley 31 in. Mach 10 hypersonic wind tunnel. Approximately 200 timecorrelated image sequences of between 10 and 20 individual frames were obtained over eight days of wind tunnel testing spanning two entries in March and September of 2009. The image sequences presented were obtained from the boundary layer of a 20° flat plate model, in which transition was induced using a variety of different shaped protuberances, including a cylinder and a triangle. The high-speed image sequences captured a variety …
Quantitative Time-Averaged Gas And Liquid Distributions Using X-Ray Fluorescence And Radiography In Atomizing Sprays, Christopher D. Radke, J. Patrick Mcmanamen, Alan L. Kastengren, Benjamin R. Halls, Terrence R. Meyer
Quantitative Time-Averaged Gas And Liquid Distributions Using X-Ray Fluorescence And Radiography In Atomizing Sprays, Christopher D. Radke, J. Patrick Mcmanamen, Alan L. Kastengren, Benjamin R. Halls, Terrence R. Meyer
Terrence R Meyer
A method for quantitative measurements of gas and liquid distributions is demonstrated using simultaneous x-ray fluorescence and radiography of both phases in an atomizing coaxial spray. Synchrotron radiation at 10.1 keV from the Advanced Photon Source at Argonne National Laboratory is used for x-ray fluorescence of argon gas and two tracer elements seeded into the liquid stream. Simultaneous time-resolved x-ray radiography combined with timeaveraged dual-tracer fluorescence measurements enabled corrections for reabsorption of x-ray fluorescence photons for accurate, line-of-sight averaged measurements of the distribution of the gas and liquid phases originating from the atomizing nozzle.
Quantitative Measurement Of Binary Liquid Distributions Using Multiple-Tracer X-Ray Fluorescence And Radiography, Benjamin R. Halls, Terrence R. Meyer, Alan L. Kastengren
Quantitative Measurement Of Binary Liquid Distributions Using Multiple-Tracer X-Ray Fluorescence And Radiography, Benjamin R. Halls, Terrence R. Meyer, Alan L. Kastengren
Terrence R Meyer
The complex geometry and large index-of-refraction gradients that occur near the point of impingement of binary liquid jets present a challenging environment for optical interrogation. A simultaneous quadruple-tracer x-ray fluorescence and line-of-sight radiography technique is proposed as a means of distinguishing and quantifying individual liquid component distributions prior to, during, and after jet impact. Two different pairs of fluorescence tracers are seeded into each liquid stream to maximize their attenuation ratio for reabsorption correction and differentiation of the two fluids during mixing. This approach for instantaneous correction of xray fluorescence reabsorption is compared with a more time-intensive approach of using …
Simultaneous Planar Laser-Induced Incandescence, Oh Planar Laser-Induced Fluorescence, And Droplet Mie Scattering In Swirl-Stabilized Spray Flames, Terrence Meyer, Sukesh Roy, Vincent Belovich, Edwin Corporan, James Gord
Simultaneous Planar Laser-Induced Incandescence, Oh Planar Laser-Induced Fluorescence, And Droplet Mie Scattering In Swirl-Stabilized Spray Flames, Terrence Meyer, Sukesh Roy, Vincent Belovich, Edwin Corporan, James Gord
Terrence R Meyer
Simultaneous planar laser-induced incandescence, hydroxyl radical planar laser-induced fluorescence, and droplet Mie scattering are used to study the instantaneous flame structure and soot formation process in an atmospheric pressure, swirl-stabilized, liquid-fueled, model gas-turbine combustor. Optimal excitation and detection schemes to maximize single-shot signals and avoid interferences from soot-laden flame emission are discussed. The data indicate that rich pockets of premixed fuel and air along the interface between the spray flame and the recirculation zone serve as primary sites for soot inception. Intermittent large-scale structures and local equivalence ratio are also found to play an important role in soot formation.
Vortex-Induced Flame Extinction In Two-Phase Counterflow Diffusion Flames With Ch Planar Laser-Induced Fluorescence And Particle-Image Velocimetry, Alix Lemaire, Terrence R. Meyer, Katharina Zahringer, Juan C. Rolon, James R. Gord
Vortex-Induced Flame Extinction In Two-Phase Counterflow Diffusion Flames With Ch Planar Laser-Induced Fluorescence And Particle-Image Velocimetry, Alix Lemaire, Terrence R. Meyer, Katharina Zahringer, Juan C. Rolon, James R. Gord
Terrence R Meyer
Here the interaction between a laminar two-phase, non-pre-mixed counterflow flame and a vortex is examined. Special emphasis is given to the influence of different flame and vortex parameters on the extinction behavior of the flame. Simultaneaous planar laser-induced fluorescence of the CH radical layer produced by the flame and particle-image velocimetry measurements of the flowfield are used to characterize the flame–vortex interaction. These simultaneous diagnostics are used for the first time in this configuration. The extinction processes occurring during the flame–vortex interaction can be analyzed by this method, especially the influence of strain at the flame surface. The influence of …