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Planar Laser Induced Fluorescence Measurements Of The Hydroxyl Radical Concentration In An Acoustically Excited Dump Combustor
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Book Synopsis Planar Laser-induced Fluorescence Measurements of the Hydroxyl Radical Concentration in an Acoustically Excited Dump Combustor by : Christopher P. Cadou
Download or read book Planar Laser-induced Fluorescence Measurements of the Hydroxyl Radical Concentration in an Acoustically Excited Dump Combustor written by Christopher P. Cadou and published by . This book was released on 1991 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Quantitative Measurement of Hydroxyl Radical (OH) Concentration in Premixed Flat Flame by Combining Laser-induced Fluorescence and Direct Absorption Spectroscopy*Project Supported by the National Natural Science Foundation of China (Grant No. 11272338), the Science and Technology on Scramjet Key Laboratory Funding, China (Grant No. STSKFKT 2013004), and the China Scholarship Council by :
Download or read book Quantitative Measurement of Hydroxyl Radical (OH) Concentration in Premixed Flat Flame by Combining Laser-induced Fluorescence and Direct Absorption Spectroscopy*Project Supported by the National Natural Science Foundation of China (Grant No. 11272338), the Science and Technology on Scramjet Key Laboratory Funding, China (Grant No. STSKFKT 2013004), and the China Scholarship Council written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: An accurate and reasonable technique combining direct absorption spectroscopy and laser-induced fluorescence (LIF) methods is developed to quantitatively measure the concentrations of hydroxyl in CH4 /air flat laminar flame. In our approach, particular attention is paid to the linear laser-induced fluorescence and absorption processes, and experimental details as well. Through measuring the temperature, LIF signal distribution and integrated absorption, spatially absolute OH concentrations profiles are successfully resolved. These experimental results are then compared with the numerical simulation. It is proved that the good quality of the results implies that this method is suitable for calibrating the OH-PLIF measurement in a practical combustor.
Book Synopsis Laser-Based Measurements of OH, Temperature, and Water Vapor Concentration in a Hydrocarbon-Fueled Scramjet (POSTPRINT). by :
Download or read book Laser-Based Measurements of OH, Temperature, and Water Vapor Concentration in a Hydrocarbon-Fueled Scramjet (POSTPRINT). written by and published by . This book was released on 2008 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two laser-based measurement techniques are implemented in a direct-connect hydrocarbon-fueled scramjet combustor. Planar laser-induced fluorescence (PLIF) of the OH radical is used to examine the flame structure within the combustor. Tunable diode laser-based absorption spectroscopy (TDLAS) is used to measure water vapor concentration and static temperature near the combustor exit. Combined with conventional measurements and Reynolds-averaged CFD simulations, these optical diagnostic techniques significantly enhance the information that is obtained from the scramjet combustor. Wall pressure data show the combustor to be operating in dual-mode with two regions of elevated pressure corresponding to the primary and secondary flameholding zones. The OH radical is well-distributed across the combustor with high OH concentrations occurring along the body, side, and cowl walls. TDLAS measurements indicate non-uniform body-to-cowl profiles in both temperature and water concentration. Near-wall regions are found to be the hottest while the core region is cooler.
Book Synopsis Planar Laser Induced Fluorescence Images of Fuel Mixing and the Reaction Zone in a Supersonic Combustor by : Rodney Aldibonti Bryant
Download or read book Planar Laser Induced Fluorescence Images of Fuel Mixing and the Reaction Zone in a Supersonic Combustor written by Rodney Aldibonti Bryant and published by . This book was released on 1998 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Oh Planar Laser Induced Fluorescence Measurements for the Study of High Pressure Flames by : Nasa Technical Reports Server (Ntrs)
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 Energy Research Abstracts written by and published by . This book was released on 1989 with total page 1470 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Heat Transfer, Fluid Mechanics and Thermodynamics 1993 by : M.D. Kelleher
Download or read book Experimental Heat Transfer, Fluid Mechanics and Thermodynamics 1993 written by M.D. Kelleher and published by Elsevier. This book was released on 2012-12-02 with total page 1002 pages. Available in PDF, EPUB and Kindle. Book excerpt: The papers contained in this volume reflect the ingenuity and originality of experimental work in the areas of fluid mechanics, heat transfer and thermodynamics. The contributors are drawn from 27 countries which indicates how well the worldwide scientific community is networked. The papers cover a broad spectrum from the experimental investigation of complex fundamental physical phenomena to the study of practical devices and applications. A uniform outline and method of presentation has been used for each paper.
Book Synopsis Laser-Induced Fluorescence of Hydroxyl (OH) Radical in Cold Atmospheric Discharges by : Jan Voráč
Download or read book Laser-Induced Fluorescence of Hydroxyl (OH) Radical in Cold Atmospheric Discharges written by Jan Voráč and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The application of laser-induced fluorescence (LIF) to measurement of absolute concentration of hydroxyl radicals in cold atmospheric discharges is described. Though only the case of OH is presented, the method can be directly applied to other molecules as well. Starting from the rate equations for the LIF process, the main formulas for two- and multi-level excitation scheme are derived. It is also shown how to use partially saturated LIF in practice, enhancing the signal-to-noise ratio. Practical tips for automating the data evaluation are given, allowing processing large data sets, particularly suitable for planar measurements. Gas temperature estimation from fluorescence on different rotational absorption lines is shown as an attractive method for obtaining temperature maps with high spatial resolution. The important aspects of calibration are discussed, particularly the overlap of the laser line with the selected absorption line and the measurement of the Rayleigh scattering for sensitivity calibration, together with the common sources of errors. The application of OH(A, v' = 0 ← X, v" = 0) excitation scheme to the effluent of atmospheric pressure plasma jet ignited in argon and of OH(A, v' = 1 ← X, v" = 0) to the plasma of coplanar surface barrier discharge in air and in water vapor is shown.
Book Synopsis Laser Induced Fluorescence (LIF) Spectroscopic Measurement of Hydroxyl (OH) Radical Concentration Near Surfaces with Varying Chemical and Thermal Activity in Low Pressure Stoichiometric Hydrogen/oxygen Flames by : Shaurya Prakash
Download or read book Laser Induced Fluorescence (LIF) Spectroscopic Measurement of Hydroxyl (OH) Radical Concentration Near Surfaces with Varying Chemical and Thermal Activity in Low Pressure Stoichiometric Hydrogen/oxygen Flames written by Shaurya Prakash and published by . This book was released on 2003 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Laser-saturated Fluorescence Measurements in Laminar Sooting Diffusion Flames by : Changlie Wey
Download or read book Laser-saturated Fluorescence Measurements in Laminar Sooting Diffusion Flames written by Changlie Wey and published by . This book was released on 1993 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: The hydroxyl radical is known to be one of the most important intermediate species in the combustion processes. The hydroxyl radical has also been considered a dominant oxidizer of soot particles in flames. In this investigation the hydroxyl concentration profiles in sooting diffusion flames were measured by the laser-saturated fluorescence (LSF) method. The temperature distributions in the flames were measured by the two-line LSF technique and by thermocouple. In the sooting region the OH fluorescence was too weak to make accurate temperature measurements. The hydroxyl fluorescence profiles for all four flames presented herein show that the OH fluorescence intensities peaked near the flame front. The OH fluorescence intensity dropped sharply toward the dark region of the flame and continued declining to the sooting region. The OH fluorescence profiles also indicate that the OH fluorescence decreased with increasing height in the flames for all flames investigated. Varying the oxidizer composition resulted in a corresponding variation in the maximum OH concentration and the flame temperature. Furthermore, it appears that the maximum OH concentration for each flame increased with increasing flame temperature.
Book Synopsis Initial Two-dimensional Laser Induced Fluorescence Measurements of Hydroxyl Radicals in an Internal Combustion Engine by : Philip G. Felton
Download or read book Initial Two-dimensional Laser Induced Fluorescence Measurements of Hydroxyl Radicals in an Internal Combustion Engine written by Philip G. Felton and published by . This book was released on 1988 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Laser-induced Fluorescence and Performance Analysis of the Ultra-Compact Combustor by : Patrick J. Lakusta
Download or read book Laser-induced Fluorescence and Performance Analysis of the Ultra-Compact Combustor written by Patrick J. Lakusta and published by . This book was released on 2008 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Excitation/detection strategies for OH planar laser-induced fluorescence measurements in the presence of interfering fuel signal and absorption effects by :
Download or read book Excitation/detection strategies for OH planar laser-induced fluorescence measurements in the presence of interfering fuel signal and absorption effects written by and published by . This book was released on 2011 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Application of the Planar Laser Induced Fluorescence Imaging Technique of the Hydroxyl Radical in the Qualitative Investigation of Bunsen Burner Flames at Atmospheric Conditions by : Spyridon Simis
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:
Book Synopsis Rapid Concentration Measurements by Picosecond Time-Resolved Laser-Induced Fluorescence by :
Download or read book Rapid Concentration Measurements by Picosecond Time-Resolved Laser-Induced Fluorescence written by and published by . This book was released on 1998 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantitative measurements of scalars in combustion are crucial to our understanding of flame structure and pollutant production. Progress has been made in quantitatively characterizing many laminar flames; however, the inherent fluctuations in turbulent flames significantly complicate such measurements. Picosecond time-resolved laser-induced fluorescence (PITLIF) is a developing technique which seeks to provide the first known means of obtaining quantitative minor-species concentrations in flames at rates sufficient for the study of turbulent fluctuations. This method was developed and applied to measurements of sodium and OH concentrations in laminar flames under previous AFOSR funding. The present report details the construction of a second generation PITLIF instrument. The primary goal of this work is to provide a continuous time series of quantitative concentrations from which frequency domain statistics such as the power spectral density (PSD) can be computed. Using the new laser system, fluorescence measurements of CH and OH time series were collected in a variety of methane and hydrogen flames including nonpremixed turbulent flames. These data have also been compared with available velocity and temperature measurements. The time series and resulting PSDs represent the first measurements of these statistics for minor-species concentrations.
Book Synopsis CONCENTRATION MEASUREMENTS IN A COLD FLOW MODEL ANNULAR COMBUSTOR USING LASER INDUCED FLUORESCENCE FINAL REPORT... NASA-CR-182252... MAR. 2 by : United States. National Aeronautics and Space Administration
Download or read book CONCENTRATION MEASUREMENTS IN A COLD FLOW MODEL ANNULAR COMBUSTOR USING LASER INDUCED FLUORESCENCE FINAL REPORT... NASA-CR-182252... MAR. 2 written by United States. National Aeronautics and Space Administration and published by . This book was released on 1998* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Planar Laser-induced Fluorescence Imaging of Flame Heat Release Rate by :
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.
