by Dept. of Energy, Sandia Laboratories, for sale by the National Technical Information Service] in [Livermore, Calif.], [Springfield, Va .
Written in English
|Statement||Robert J. Cattolica, Combustion Physics Division, Sandia Laboratories ; prepared by Sandia Laboratories for the United States Department of Energy|
|Series||SAND ; 79-8717|
|Contributions||United States. Dept. of Energy, Sandia Laboratories. Combustion Physics Division 8351|
|The Physical Object|
|Pagination||78 p. :|
|Number of Pages||78|
The concentration of the OH radical in a stoichiometric methane-air flat flame at atmospheric pressure was measured with both laser-absorption spectroscopy and molecular-beam mass spectrometry (MBMS). Twenty-Sixth Symposium (International) on Combustion/The Combustion Institute, /pp. TUNABLE DIODE LASER ABSORPTION MEASUREMENTS OF CARBON MONOXIDE AND TEMPERATURE IN A TIME-VARYING, METHANE/AIR, NON-PREMIXED FLAME R. REED SKAGGS and J. HOUSTON MILLER Department of Chemistry The George Washington University Washington, DC , USA A time-varying, axi-symmetric, methane/air Cited by: G. Zizak, J. J. Horvath, and J. D. Winefordner, Flame temperature measurement by redistribution of rotational population in laser excited fluorescences An application to the OH radical in a methane-air flame, osc., (). ADS CrossRef Google ScholarCited by: 2. Abstract. Measurements of HCN in flat, fuel-rich premixed methane/air flames at atmospheric pressure are reported. Quartz-microprobe sampling followed by wavelength modulation absorption spectroscopy with second harmonic detection was used to obtain an overall measurement uncertainty of better than 20% for mole fractions HCN on the order of 10 ppm.
release of an unconfined, turbulent methane-air swirl flame from laser optical and chemiluminescence measurements. For optimal optical access the perfectly premixed flame is operated unconfined. As a consequence the air-fuel ratio of the flame is not constant due to ambient air entrainment. Therefore, the unconfined flame is aFile Size: 1MB. Scherer, J J, Aniolek, K W, Cernansky, N P, & Rakestraw, D J. Determination of methyl radical concentrations in a methane/air flame by infrared cavity ringdown laser absorption spectroscopy. United States. doi/ The application of tunable diode lasers for in situ diagnostics in laminar hydrocarbon diffusion flames is demonstrated. By the use of both direct-absorption and wavelength-modulation (second-derivative) techniques, carbon monoxide concentrations and the local flame temperature are determined for a laminar methane–air diffusion flame supported on a Wolfhard–Parker slot burner. The effects of Hydrogen addition in lean Methane/Air premixed turbulent flames are investigated in a Bunsen type burner using Laser Doppler Velocimetry. The Hydrogen content is varied between 0% and 20% in volume of the total fuel inside the mixture, keeping constant the equivalence ratio. All measurements are carried out in the pressure range.
Quantitative measurements of radical concentrations are important in studies of the structure of flames. In this research, a quantitative analysis was performed using laser-induced predissociative fluorescence of OH radicals (OH-LIPF) in high-pressure (1–5 atm) premixed methane-air and propane-air flat flames (ϕ = –).OH was excited (A 2 Σ +, ν′ = 3 − X 2 Π, ν″=0, and P 2 8 Cited by: 2. Ultrasensitive diode laser direct absorption measurements: applications to mass flux flight instrumentation Rapid determination of flame temperature profiles using OH LIF on a limited number of rotational lines. Bradley A. Williams, Comparison of laser-based flame . by the laser in a stoichiometric premixed methane-air flame. The atomic emission lines of Hα at nm, O at nm and N at nm are very well resolved. The peak of N at is also visible but not well resolved. As the intensity of each spectral line is proportional to. Reducing vehicle pollutant emissions and fuel consumption is becoming more and more important challenges, while lean-burning are a promising development. However, lean-burning may leads to other problems including combustion instability and incomplete combustion. Recently, laser ignition system has become an attractive field of research in order to replace the conventional spark plug ignition Author: Hong Tao Wang, Cang Su Xu.