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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 47 for “"Planar laser-induced fluorescence"”.
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Hydroxyl-Radical Planar Laser-Induced Fluorescence Imaging of Turbulent Supersonic Combustion
… flow from non-intrusive hydroxyl radical (OH) planar laser-induced fluorescence (PLIF) images are presented. The OH PLIF images show instantaneous structures of turbulence in two combustor configurations at different fuel equivalence ratios in the University of Virginia Supersonic Combustion …
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In Situ Flame Structure Imaging of Composite Propellants using High-Speed Planar Laser-Induced Fluorescence
… the models themselves. Recently, high-speed OH planar laser-induced fluorescence (PLIF) imaging has been applied to AP composite propellants to determine how microscale propellant flame structure varies with propellant formulation and pressure. Propellants with monomodal AP particle size …
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DEVELOPMENT OF KRYPTON PLANAR LASER INDUCED FLUORESCENCE METHODS FOR THE MEASUREMENT OF HYPERSONIC FLOW CONDITIONS
… this project was to develop a scalable krypton planar laser induced fluorescence flow visualization system for use on curved-surface geometries in sup- port of the hypersonic Boundary Layer Transition (BOLT) program. The system was designed to fit multiple wind-tunnel facilities, including the …
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Planar Laser Induced Fluorescence Experiments and Modeling Study of Jets in Crossflow at Various Injection Angles
Planar Laser Induced Fluorescence (PLIF) with acetone seeding was applied to measure the scalar fields of an axisymmetric freejet and an inclined jet-in-crossflow as applicable to film cooling. From the scalar fields, jet-mixing and trajectory characteristics were obtained. In order to validate the …
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Remote three-dimensional temperature sensing using planar laser induced fluorescence : development and applications to microwave heated liquids
… thesis describes the development of a 3D imaging fluorescence thermometry system that was used to examine temporal and spatial variations in temperature within various aqueous solutions during their heating by microwave irradiation. The work provides one of the first experimentally-determined …
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Experimental Investigation of a Lean, Premixed Gas Turbine Combustor Using Advanced Laser Diagnostics
… 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 …
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Analysis of Flow and Transport in Refractive Index Matched Porous Media
… a high temporal and spatial resolution using planar laser-induced fluorescence. For the data analysis specifically adapted algorithms for image preprocessing have been developed and a method for local parameter estimation has been adapted and significantly enhanced for the present application. …
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Experimental and computational study of non-turbulent flow regimes and cavern formation of non-Newtonian fluids in a stirred tank
… mechanistic cavern prediction models. An adapted planar laser induced fluorescence technique showed that mixing inside of a shear thinning Herschel-Bulkley fluid is very slow. Positron emission particle tracking obtained flow patterns and cavern sizes of three rheologically complex opaque fluids. …
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Flame Surface Density Measurements and Curvature Statistics for Turbulent Premixed Bunsen Flames
… combustion was analyzed through CH (methylidyne) planar laser induced fluorescence (PLIF). Flame topography measurements in terms of flame surface density and curvature were calculated based on the flame front detected by the CH PLIF signal. The goal of this work was to investigate turbulent …
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Pyrolysis oil combustion characteristics and exhaust emissions in a swirl-stabilized flame
… speed imaging of flame luminosity and several laser diagnostic methods including Mie scattering, hydroxyl radical planar induced fluorescence (OH-PLIF), fuel planar laser-induced fluorescence (Fuel-PLIF), and laser induced incandescence (LII). Spray characteristics have been investigated by …
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Experimental investigations into high-altitude relight of a gas turbine
… a ground-based test facility. The application of laser diagnostics presents particular difficulties due to the large quantities of liquid fuel that impinge on the combustor walls during relight. Advances are made in the application of planar laser-induced fluorescence (PLIF) to monitor fuel …
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In cylinder liquid fuel visualization during cold start
… to the increased levels. This work uses planar laser induced fluorescence to visualize the development of liquid fuel in the cylinder of a firing SI engine. A closed valve injection strategy was used, as this is the strategy most commonly found in practice. Fluorescence from indolene and …
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Passive Scalar Measurements In Actively Excited Free Shear Flows
… of phase-locked concentration field data using planar Mie scattering from smoke particles and planar laser-induced fluorescence of acetone. Both techniques were shown to be effective in providing information for the actively excited nozzles. However, the laser-induced fluorescence technique was …
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Incident shock Mach number effects on Richtmyer-Meshkov mixing with simultaneous density and velocity measurements
… is measured using simultaneous quantitative Planar Laser-Induced Fluorescence (PLIF) and Particle Image Velocimetry (PIV) for the first time in a Richtmyer-Meshkov Mach number study, while exceptional experimental repeatability allows for isolation of Mach number effects. Investigated are the …
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The effects of fuel volatility and operating conditions on sprays from pressure-swirl fuel injectors
… using a firing optically-accessible engine. Planar laser-induced fluorescence and planar Mie scattering imaging experiments were performed to show changes in the spray structure, including its radial and axial penetration. Phase-Doppler particle analysis experiments were included to track the …
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Equivalence Ratio Gradient Effects on Local Flame Front Topology and Heat Release Rate in Stratified, Iso-Octane/Air Turbulent V-Flames
… approach was devised in which 3-pentanone tracer planar laser induced fluorescence (PLIF) was used to determine an analysis region of interest (ROI) within the flame. Iso-contours of equivalence ratio were traced up to the mean position of the flame front to define the width of the ROI, which was …
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Laser Diagnostic Techniques with Ultra-High Repetition Rate for Studies in Combustion Environments
When conducting laser based diagnostics in combustion environments it is often desirable to obtain temporally resolved information. This can be due to several factors such as combustion taking place in a turbulent flow field, flame propagation from a spark plug in an initially quiescent combustible …
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Flow Field and Soot Formation Characteristics in Swirl-stabilized Non-premixed Turbulent Flames
… size, dp, were measured using auto-compensating laser-induced incandescence, and planar three-component velocity fields were measured using stereoscopic particle image velocimetry. Measurements of planar laser-induced fluorescence of OH and OH* chemiluminescence were also made for methane and …
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Quantitative Acetone PLIF Measurements of Jet Mixing with Synthetic Jet Actuators
… to the flow axis) was investigated using planar laser-induced fluorescence of acetone. The synthetic jets are a promising new mixing control and enhancement technology with a wide range of capabilities. An image correction scheme that improved on current ones was applied to the images …
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In-Cylinder Soot Oxidation in an Optically Accessible Automotive Diesel Engine
… process. In this regard, various optical/laser-based imaging diagnostics were performed to unveil the development of high-temperature reaction and soot in small-bore optical diesel engines, which include OH* chemiluminescence, planar laser-induced fluorescence of hydroxyl (OH-PLIF) and …
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