Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Atmospheric pressure (1)
- Coherent anti-Stokes Raman-scattering (CARS) (1)
- Combustors (1)
- Droplets Mie scattering (1)
- Flame emission (1)
-
- Flammability (1)
- Fluorescence (1)
- Gas turbines (1)
- Hydrocarbons (1)
- Incandescence (1)
- Mole fraction (1)
- Planar laser-inducted fluorescence (PLIF) (1)
- Planar-laser induced fluorescence (PLIF) (1)
- Raman spectroscopy (1)
- Scattering (1)
- Semiconductor lasers (1)
- Sensors (1)
- Soot (1)
- Spray flames (1)
- Turbines (1)
- Ultraviolet radiation (1)
Articles 1 - 2 of 2
Full-Text Articles in Entire DC Network
Measurements Of Oh Mole Fraction And Temperature Up To 20 Khz By Using A Diode-Laser-Based Uv Absorption Sensor, Terrence Meyer, Sukesh Roy, Thomas Anderson, Joseph Miller, Vlswanath Katta, Robert Lucht, James Gord
Measurements Of Oh Mole Fraction And Temperature Up To 20 Khz By Using A Diode-Laser-Based Uv Absorption Sensor, Terrence Meyer, Sukesh Roy, Thomas Anderson, Joseph Miller, Vlswanath Katta, Robert Lucht, James Gord
Terrence R Meyer
Diode-laser-based sum-frequency generation of ultraviolet (UV) radiation at 313.5 nm was utilized for high-speed absorption measurements of OH mole fraction and temperature at rates up to 20 kHz. Sensor performance was characterized over a wide range of operating conditions in a 25.4 mm path-length, steady, C2H4-air diffusion flame through comparisons with coherent anti-Stokes Raman spectroscopy (CARS), planar laser-induced fluorescence (PLIF), and a two-dimensional numerical simulation with detailed chemical kinetics. Experimental uncertainties of 5% and 11% were achieved for measured temperatures and OH mole fractions, respectively, with standard deviations of <3% at 20 kHz and an OH detection limit of <1 part per million in a l m path length. After validation in a steady flame, high-speed diode-laser-based measurements of OH mole fraction and temperature were demonstrated for the first time in the unsteady exhaust of a liquid-fueled, swirl-stabilized combustor. Typical agreement of 5% was achieved with CARS temperature measurements at various fuel/air ratios, and sensor precision was sufficient to capture oscillations of temperature and OH mole fraction for potential use with multiparameter control strategies in combustors of practical interest.
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.