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Concentration Measurements In A Cold Flow Model Annular Combustor Using Laser Induced Fluorescence Final Report Nasa Cr 182252 Mar 2
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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:
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...
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 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.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722707279 Total Pages :64 pages Book Rating :4.7/5 (72 download)
Book Synopsis Quantitative Plif Imaging in High-Pressure Combustion by : National Aeronautics and Space Administration (NASA)
Download or read book Quantitative Plif Imaging in High-Pressure Combustion written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-10 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the final report for a research project aimed at developing planar laser-induced fluorescence (PLIF) techniques for quantitative 2-D species imaging in fuel-lean, high-pressure combustion gases, relevant to modem aircraft gas turbine combustors. The program involved both theory and experiment. The theoretical activity led to spectroscopic models that allow calculation of the laser-induced fluorescence produced in OH, NO and 02 for arbitrary excitation wavelength, pressure, temperature, gas mixture and laser linewidth. These spectroscopic models incorporate new information on line- broadening, energy transfer and electronic quench rates. Extensive calculations have been made with these models in order to identify optimum excitation strategies, particularly for detecting low levels (ppm) of NO in the presence of large 02 mole fractions (10% is typical for the fuel-lean combustion of interest). A promising new measurement concept has emerged from these calculations, namely that excitation at specific wavelengths, together with detection of fluorescence in multiple spectral bands, promises to enable simultaneous detection of both NO (at ppm levels) and 02 or possibly NO, 02 and temperature. Calculations have been made to evaluate the expected performance of such a diagnostic for a variety of conditions and choices of excitation and detection wavelengths. The experimental effort began with assembly of a new high-pressure combustor to provide controlled high-temperature and high-pressure combustion products. The non-premixed burner enables access to postflame gases at high temperatures (to 2000 K) and high pressures (to 13 atm), and a range of fuel-air equivalence ratios. The chamber also allowed use of a sampling probe, for chemiluminescent detection of NO/NO2, and thermocouples for measurement of gas temperature. Experiments were conducted to confirm the spectroscopic models for OH, NO and 02. Hanson, R. K. Glenn Research Center...
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 Photodiagnostics of Turbulent Flows Using Laser-induced Fluorescence by :
Download or read book Photodiagnostics of Turbulent Flows Using Laser-induced Fluorescence written by and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Quantitative Measurement of 2-D Fuel Vapor Concentration in a Transient Spray Via Laser-induced Fluorescence Technique by : Chi-Nan Yeh
Download or read book Quantitative Measurement of 2-D Fuel Vapor Concentration in a Transient Spray Via Laser-induced Fluorescence Technique written by Chi-Nan Yeh and published by . This book was released on 1994 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Laser Induced Fluorescence Gas Puff Density Measurements by : Matthew Thomas Evans
Download or read book Laser Induced Fluorescence Gas Puff Density Measurements written by Matthew Thomas Evans and published by . This book was released on 2012 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: The double gas puff valve is a device used to inject a supersonic puff of gas to act as a load in z-pinch plasma implosions. The purpose of the annular gas shells is to mimic a cylindrical column along the z-axis in efforts to reduce Rayleigh-Taylor instability. However before integration of the valve into the zpinch pulsed power machine the gas profile needs to be examined. Tuning the density of the gas to fit specific profiles leads to improvement in plasma radiative sources and yields. The axial uniformity of the cylindrical gas column is highly dependent on the nozzle characteristics and shape. Performance is then determined by the density, speed, and symmetry of the gas column. Measurement of the density distribution is performed using a spectroscopic measuring technique called laser-induced fluorescence. LIF is a 1-dimensional imaging technique that maps the concentration of atoms with the aid of a tracer. LIF and the 2-dimensional counterpart planar laser-induced fluorescence (PLIF) examine the gas flow in the r-z plane with sub-millimeter resolution. The tracer molecule fluoresces due to excitation by a laser beam. The fluorescence signal is imaged using a streak camera and a charge-coupled-device (CCD) in combination. The method also allows the study of gas puff reliability. Any differences between gas shells can then be examined and interpreted with reliable certainty. Imaging software is used to determine the density from the intensity of the fluorescence images. A detail account of the process is illustrated in this study. A control system was constructed for operations of the gas puff valve in both LIF and z-pinch experiments. The pressure system is designed to tailor specific profiles as needed. The LIF system is detailed along with any components built for the gas puff valve. Results of these measurements serve to verify the uniformity of flow and determine the density distribution of the gas puff.
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 Investigation of Laser Induced Fluorescence for Concentration Measurements of Diatomic Sulfur by : Tyrie R. Robbins
Download or read book Investigation of Laser Induced Fluorescence for Concentration Measurements of Diatomic Sulfur written by Tyrie R. Robbins and published by . This book was released on 1981 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis investigated the feasibility of using laser induced fluorescence to measure S2 number densities in a laboratory environment. The research was prompted by the growing interest in S2, especially its potential as a tunable, high-power laser medium. In concept, laser induced fluorescence proved to be a feasible means of measuring S2 concentrations in a laboratory environment. Differences between the known and calculated number densities are attributed to the complexity of S2, quenching and radiation trapping, difficulties in measuring the effective lifetime, and inadequacies in the rate equation model.
Book Synopsis Wide Area GPS Enhancement (WAGE) Evaluation by :
Download or read book Wide Area GPS Enhancement (WAGE) Evaluation written by and published by . This book was released on 1997 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Cruiser's Gear Carrying System by : George Jackson
Download or read book Cruiser's Gear Carrying System written by George Jackson and published by . This book was released on 1997 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Disposing of Ammunition, Explosives, and Incendiaries by :
Download or read book Disposing of Ammunition, Explosives, and Incendiaries written by and published by . This book was released on 1997 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U.S. Government Subscriptions written by and published by . This book was released on 1999 with total page 864 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Guide to Franklin Nature Trail by :
Download or read book A Guide to Franklin Nature Trail written by and published by . This book was released on 1994 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research Note SRS written by and published by . This book was released on 1996 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
