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Laser Induced Fluorescence Measurements Of Radical Species In Flames Of Methane Nitrous Oxide And Formaldehyde Nitrous Oxide
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Book Synopsis Laser-induced Fluorescence Measurements of Radical Species in Flames of Methane-nitrous Oxide and Formaldehyde-nitrous Oxide by : Mohammed Badr Ahmed Habeebullah
Download or read book Laser-induced Fluorescence Measurements of Radical Species in Flames of Methane-nitrous Oxide and Formaldehyde-nitrous Oxide written by Mohammed Badr Ahmed Habeebullah and published by . This book was released on 1989 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721932153 Total Pages :202 pages Book Rating :4.9/5 (321 download)
Book Synopsis Laser-Induced Fluorescence Measurements and Modeling of Nitric Oxide in Counterflow Diffusion Flames by : National Aeronautics and Space Administration (NASA)
Download or read book Laser-Induced Fluorescence Measurements and Modeling of Nitric Oxide in Counterflow Diffusion Flames written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-27 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: The feasibility of making quantitative nonintrusive NO concentration ([NO]) measurements in nonpremixed flames has been assessed by obtaining laser-induced fluorescence (LIF) measurements of [NO] in counterflow diffusion flames at atmospheric and higher pressures. Comparisons at atmospheric pressure between laser-saturated fluorescence (LSF) and linear LIF measurements in four diluted ethane-air counterflow diffusion flames with strain rates from 5 to 48/s yielded excellent agreement from fuel-lean to moderately fuel-rich conditions, thus indicating the utility of a model-based quenching correction technique, which was then extended to higher pressures. Quantitative LIF measurements of [NO] in three diluted methane-air counterflow diffusion flames with strain rates from 5 to 35/s were compared with OPPDIF model predictions using the GRI (version 2.11) chemical kinetic mechanism. The comparisons revealed that the GRI mechanism underpredicts prompt-NO by 30-50% at atmospheric pressure. Based on these measurements, a modified reaction rate coefficient for the prompt-NO initiation reaction was proposed which causes the predictions to match experimental data. Temperature measurements using thin filament pyrometry (TFP) in conjunction with a new calibration method utilizing a near-adiabatic H2-air Hencken burner gave very good comparisons with model predictions in these counterflow diffusion flames. Quantitative LIF measurements of [NO] were also obtained in four methane-air counterflow partially-premixed flames with fuel-side equivalence ratios (phi(sub B)) of 1.45, 1.6, 1.8 and 2.0. The measurements were in excellent agreement with model predictions when accounting for radiative heat loss. Spatial separation between regions dominated by the prompt and thermal NO mechanisms was observed in the phi(sub B) = 1.45 flame. The modified rate coefficient proposed earlier for the prompt-NO initiation reaction improved agreement between code predictions and measurements in the re
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1990 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Laser-induced Fluorescence Radical Measurements in Partially Premixed Bunsen-type Methane Flames by : Norbert H. Heberle
Download or read book Laser-induced Fluorescence Radical Measurements in Partially Premixed Bunsen-type Methane Flames written by Norbert H. Heberle and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781724277794 Total Pages :244 pages Book Rating :4.2/5 (777 download)
Book Synopsis Laser Induced Fluorescence Measurements and Modeling of Nitric Oxide in High-Pressure Premixed Flames by : National Aeronautics and Space Administration (NASA)
Download or read book Laser Induced Fluorescence Measurements and Modeling of Nitric Oxide in High-Pressure Premixed Flames written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-25 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laser-induced fluorescence (LIF) has been applied to the quantitative measurement of nitric oxide (NO) in premixed, laminar, high-pressure flames. Their chemistry was also studied using three current kinetics schemes to determine the predictive capabilities of each mechanism with respect to NO concentrations. The flames studied were low-temperature (1600 less than T less than 1850K) C2H6/O2/N2 and C2H6/O2/N2 flames, and high temperature (2100 less than T less than 2300K) C2H6/O2/N2 flames. Laser-saturated fluorescence (LSF) was initially used to measure the NO concentrations. However, while the excitation transition was well saturated at atmospheric pressure, the fluorescence behavior was basically linear with respect to laser power at pressures above 6 atm. Measurements and calculations demonstrated that the fluorescence quenching rate variation is negligible for LIF measurements of NO at a given pressure. Therefore, linear LIF was used to perform quantitative measurements of NO concentration in these high-pressure flames. The transportability of a calibration factor from one set of flame conditions to another also was investigated by considering changes in the absorption and quenching environment for different flame conditions. The feasibility of performing LIF measurements of (NO) in turbulent flames was studied; the single-shot detection limit was determined to be 2 ppm. Reisel, John R. and Laurendeau, Normand M. Unspecified Center NASA-CR-195404, E-9248, NAS 1.26:195404 NAG3-1038; RTOP 537-02-20...
Book Synopsis Laser-induced Fluorescence Measurements of Radicals in Low-pressure Flames to Optimize Combustion Chemistry by : Jay B. Jeffries
Download or read book Laser-induced Fluorescence Measurements of Radicals in Low-pressure Flames to Optimize Combustion Chemistry written by Jay B. Jeffries and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Assessment and Enhancement of Planar Laser-Induced Fluorescence Measurements of Nitric Oxide in an Inverse Diffusion Flame by :
Download or read book Experimental Assessment and Enhancement of Planar Laser-Induced Fluorescence Measurements of Nitric Oxide in an Inverse Diffusion Flame written by and published by . This book was released on 1997 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis American Doctoral Dissertations by :
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1989 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fossil Energy Update written by and published by . This book was released on 1981 with total page 886 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Quantitative Planar Laser-induced Fluorescence Imaging of Radical Species in High Pressure Flames by : B. E. Battles
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:
Book Synopsis Reactions of Hydroxyl Radicals with Oxygenated Hydrocarbons in the Gas Phase: A Laser Photolysis/Laser-Induced Fluorescence Study by : Cornelie Bänsch
Download or read book Reactions of Hydroxyl Radicals with Oxygenated Hydrocarbons in the Gas Phase: A Laser Photolysis/Laser-Induced Fluorescence Study written by Cornelie Bänsch and published by Logos Verlag Berlin GmbH. This book was released on 2017 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydroxyl radicals (OH) play a key role in ignition processes and in the atmosphere. Thus, the detailed knowledge of the kinetics of OH reactions is crucial in combustion and atmospheric research. In this work, an experimental approach for time-resolved studies of OH radical reactions at high pressures with pulsed laser photolysis/laser-induced fluorescence was revised and the reactions of dimethyl ether, diethyl ether, and dimethoxymethane with OH radicals were investigated in detail. The results reveal a deeper insight into the reaction processes of ether compounds with OH in general, contributing to a better understanding of the combustion of different biofuels and fuel additives.
Book Synopsis Measurement of Radical-species Concentrations and Polycyclic Aromatic Hydrocarbons in Flames by Fluorescence and Absorption Using a Tunable Dye Laser. Progress Report, March 1, 1980-February 28, 1981 by :
Download or read book Measurement of Radical-species Concentrations and Polycyclic Aromatic Hydrocarbons in Flames by Fluorescence and Absorption Using a Tunable Dye Laser. Progress Report, March 1, 1980-February 28, 1981 written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A theoretical and experimental investigation of OH saturated fluorescence is described. The goal of the research is to develop a saturated fluorescence technique which will yield accurate molecular number densities over a wide range of flame pressure, temperature, and composition. Experimentally, OH is excited by a ten nanosecond pulse from a Nd:YAG-pumped dye laser tuned to an isolated rotational transition in the (0,0) band of the A2.sigma.-X2 pi electronic system. The resulting fluorescence signal is resolved both spectrally and temporally. Total OH number densities are calculated by collecting fluorescence from the directly excited upper rotational level, and using the balanced cross-rate model to analyze the experimental data. Fluorescence measurements of OH number density agree to within a factor of three with the results of independent OH absorption measurements. Significantly, the ratio of the fluorescence signal to the number density measured by absorption is nearly the same in 30, 100 and 250 torr H2/O2/N2 flat flames, demonstrating the insensitivity of the saturated fluorescence signal to the quenching environment of the radical. Collisional transfer in excited OH is studied by recording the time development of OH fluorescence spectrum. The experimental spectra are compared with the results of time-dependent computer modeling. By varying rotational transfer rates until the calculated and experimental spectra agree, rotational transfer cross sections can be calculated. The signal processing system was thoroughly checked by comparing the photomultiplier output to that of a fast photodiode, and by comparing single pulse Rayleigh scattering and fluorescence traces with sampling oscilloscope traces.
Book Synopsis Measurement of Peroxy Radicals Using Laser- Induced Fluorescence Technique by : Hendrik Fuchs
Download or read book Measurement of Peroxy Radicals Using Laser- Induced Fluorescence Technique written by Hendrik Fuchs and published by . This book was released on 2006 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2734 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Laser Induced Fluorescence Spectroscopy of OH in Flames by : Calvin Kwok-Yu Chan
Download or read book Laser Induced Fluorescence Spectroscopy of OH in Flames written by Calvin Kwok-Yu Chan and published by . This book was released on 1979 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis New Investigation of Nitrogen Laser Induced Fluorescence in Formaldehyde. Spectra and Spectrally Resolved Lifetimes by :
Download or read book New Investigation of Nitrogen Laser Induced Fluorescence in Formaldehyde. Spectra and Spectrally Resolved Lifetimes written by and published by . This book was released on 1977 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is a considerable interest in the lifetimes and predissociation mechanisms of the excited formaldehyde molecule, H2CO. Active research is being conducted in the use of this predissociation via selective laser excitation to separate various isotopes of the three atomic species which make up the molecule. In addition, the molecule's comparatively simple structure and a large body of experimental data concerning that structure make it a useful test case for theoretical models. There are also astrophysical applications. The fact that light in the near ultraviolet causes dissociation of formaldehyde with a quantum yield which is close to one makes the molecule a sensitive detector of the radiation environment in the dense interstellar molecular clouds in which it has been observed by radio astronomy. (Author).
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.
