Download or read book Planar Laser induced Fluorescence Imaging of Lifted H2 air Flames written by P. H. Paul and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quantitative Planar Laser induced Fluorescence Imaging of Radical Species in High Pressure Flames written by B. E. Battles and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Imaging Hydrogen Flames by Two photon Laser induced Fluorescence written by R. Miles and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Oh Planar Laser Induced Fluorescence Plif Measurements for the Study of High Pressure Flames An Evaluation of a New Laser and a New Camera System written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2019-01-19 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Planar laser induced fluorescence (PLIF) is used by the Combustion Branch at the NASA Glenn Research Center (NASA Glenn) to assess the characteristics of the flowfield produced by aircraft fuel injectors. To improve and expand the capabilities of the PLIF system new equipment was installed. The new capabilities of the modified PLIF system are assessed by collecting OH PLIF in a methane/air flame produced by a flat flame burner. Specifically, the modifications characterized are the addition of an injection seeder to a Nd: YAG laser pumping an optical parametric oscillator (OPO) and the use of a new camera with an interline CCD. OH fluorescence results using the injection seeded OPO laser are compared to results using a Nd: YAG pumped dye laser with ultraviolet extender (UVX). Best settings of the new camera for maximum detection of PLIF signal are reported for the controller gain and microchannel plate (MCP) bracket pulsing. Results are also reported from tests of the Dual Image Feature (DIF) mode of the new camera which allows image pairs to be acquired in rapid succession. This allows acquisition of a PLIF image and a background signal almost simultaneously. Saturation effects in the new camera were also investigated and are reported. Tedder, Sarah and Hicks, Yolanda Glenn Research Center NASA/TM-2012-217614, E-182
Download or read book Planar Laser induced Fluorescence Imaging of Flame Heat Release Rate written by and published by . This book was released on 1997 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: Local heat release rate represents one of the most interesting experimental observables in the study of unsteady reacting flows. The direct measure of burning or heat release rate as a field variable is not possible. Numerous experimental investigations have relied on inferring this type of information as well as flame front topology from indirect measures which are presumed to be correlated. A recent study has brought into question many of the commonly used flame front marker and burning rate diagnostics. This same study found that the concentration of formyl radical offers the best possibility for measuring flame burning rate. However, primarily due to low concentrations, the fluorescence signal level from formyl is too weak to employ this diagnostic for single-pulse measurements of turbulent reacting flows. In this paper the authors describe and demonstrate a new fluorescence-based reaction front imaging diagnostic suitable for single-shot applications. The measurement is based on taking the pixel-by-pixel product of OH and CH2O planar laser-induced fluorescence images to yield an image closely related to a reaction rate. The spectroscopic and collisional processes affecting the measured signals are discussed and the foundation of the diagnostic, as based on laminar and unsteady flame calculations, is presented. The authors report the results of applying this diagnostic to the study of a laminar premixed flame subject to an interaction with an isolated line-vortex pair.
Download or read book Oh Planar Laser Induced Fluorescence Measurements for the Study of High Pressure Flames written by Nasa Technical Reports Server (Ntrs) and published by BiblioGov. This book was released on 2013-07 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Planar laser induced fluorescence (PLIF) is used by the Combustion Branch at the NASA Glenn Research Center (NASA Glenn) to assess the characteristics of the flowfield produced by aircraft fuel injectors. To improve and expand the capabilities of the PLIF system new equipment was installed. The new capabilities of the modified PLIF system are assessed by collecting OH PLIF in a methane/air flame produced by a flat flame burner. Specifically, the modifications characterized are the addition of an injection seeder to a Nd: YAG laser pumping an optical parametric oscillator (OPO) and the use of a new camera with an interline CCD. OH fluorescence results using the injection seeded OPO laser are compared to results using a Nd: YAG pumped dye laser with ultraviolet extender (UVX). Best settings of the new camera for maximum detection of PLIF signal are reported for the controller gain and microchannel plate (MCP) bracket pulsing. Results are also reported from tests of the Dual Image Feature (DIF) mode of the new camera which allows image pairs to be acquired in rapid succession. This allows acquisition of a PLIF image and a background signal almost simultaneously. Saturation effects in the new camera were also investigated and are reporte
Download or read book Laser Induced Fluorescence Imaging of Counterflow Diffusion Flames written by Kirk S. Tecu and published by . This book was released on 1997 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Steady, laminar, H$\sb4$-air, opposed jet, diffusion flames are studied with a linewise linear LIF system. The concentration measurements from the P$\sb1(7)$ excitation line of OH are gathered over 50 shots with high precision (7%) and high spatial resolution (100 $\mu$m). The signals are corrected for temperature and quenching effects from previously measured temperature and major species profiles by a linewise Raman system. The OH profiles are spatially matched to previous Raman data by comparing peak Raman Stokes/perfect gas and two-line OH temperature measurements. The OH concentration profiles are measured in flames that vary in strain rate and initial fuel dilution; mole fractions of 21% hydrogen diluted with 79% nitrogen, 50% hydrogen diluted with 50% nitrogen, and undiluted hydrogen. OH profiles are viewed in both physical and mixture fraction space. Preferential diffusion effects are evident when OH profiles are viewed in mixture fraction space. Absolute peak OH concentration values in equimolar and undiluted flames show agreement, to within precision uncertainties, with computational predictions of similar flames. A comprehensive library of temperatures, major and minor species, and scalar dissipation rates in mixture fraction space is generated for the set of flame cases when the LIF data is combined with previous Raman measurements of the same flames.
Download or read book Application of the Planar Laser Induced Fluorescence Imaging Technique of the Hydroxyl Radical in the Qualitative Investigation of Bunsen Burner Flames at Atmospheric Conditions written by Spyridon Simis and published by . This book was released on 2011 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Interference Free Laser Induced Fluorescence Imaging of Atomic Hydrogen in Flames written by and published by . This book was released on 2007 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 1016 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Simultaneous CH Planar Laser induced Fluorescence and Particle Imaging Velocimetry in Turbulent Flames written by Jeffrey M. Donbar and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Temperature Imaging in Unsteady Propane air Counterflow Diffusion Flames Using Planar Laser induced Fluorescence of OH written by Dawn A. Santoianni and published by . This book was released on 1999 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book MILD Combustion Modelling Challenges Experimental Configurations and Diagnostic Tools written by Alessandro Parente and published by Frontiers Media SA. This book was released on 2021-11-26 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Combustion Diagnostics written by KoHse-HoingHaus and published by Taylor & Francis US. This book was released on 2002-04-26 with total page 748 pages. Available in PDF, EPUB and Kindle. Book excerpt: The editors have assembled a world-class group of contributors who address the questions the combustion diagnostic community faces. They are chemists who identify the species to be measured and the interfering substances that may be present; physicists, who push the limits of laser spectroscopy and laser devices and who conceive suitable measurement schemes; and engineers, who know combustion systems and processes. This book assists in providing guidance for the planning of combustion experiments, in judging research strategies and in conceiving new ideas for combustion research. It provides a snapshot of the available diagnostic methods and thier typical applications from the perspective of leading experts in the field.
Download or read book OH Planar Laser Induced Fluorescence PLIF Measurements for the Study of High Pressure Flames written by Sarah Tedder and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Studies on the Leading Edge and Local Extinction in Lifted Jet Diffusion Flames written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Several researchers have examined the concept of flame stability and there has been little agreement regarding the reasons governing this phenomenon. The experiments described within were devised to establish the dominating stabilization mechanism in lifted flames. Specifically, the flame base of lifted methane-jet diffusion flames were examined through the use of various combinations of synchronized laser-based techniques involving particle image velocimetry (PIV), planar laser-induced fluorescence (PLIF), and Rayleigh scattering. Results indicate the presence of a structure termed a flame. Results involving the gradient in the Rayleigh signal across the flame base, in addition to two-shot CH-PLIF interpretations support the leading-edge flame as a primary stabilization mechanism. The extent of premixing upstream of the flame base has been a major source of disagreement in the past. The simultaneous Rayleigh and CH-PLIF images indicate the base of the lifted flame lies in a region that is within the flammability limits of methane burning in air. Furthermore, the average velocity at the stabilization point is 1.18 m/s (as determined from the simultaneous CH-PLIF and PIV investigation); this value is comparable to three times the laminar burning velocity of methane (~ 3S), thereby supporting previous numerical triple flame simulations. Results from the joint two-shot CH-PLIF and PIV technique show that the flame base velocity is independent of the flow conditions when the flame is stationary during the time separation of the CH-PLIF pulses. Specifically, flames with Re flow conditions. Finally, regions of local extinction -- as indicated by openings in the CH profiles -- were examined. Results from four experiments (simultaneous CH-PLIF and PIV, simultaneous CH-PLIF and OH-PLIF, simultaneous CH-PLIF and Rayleigh scattering, and simultaneous two-shot CH-PLIF and PIV) provide complementary information regarding the role of large-scale fuel vortices in initiat.
Download or read book Selected Papers on Laser Beam Diagnostics written by Robert N. Hindy and published by SPIE-International Society for Optical Engineering. This book was released on 1996 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: The papers in this volume cover topics including: laser measurements of long distances; surface flaw detection using oblique angle illumination; optical diagnostics of laser-metal interaction during welding; high-speed surface flaw detection; and sulphur chemistry in flames.
