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Investigations into the role of a premixed oxygen-hydrogen flame in flame emission spectrometryGutzler, David Eugene, 1949- January 1973 (has links)
No description available.
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Direct-sampling optical techniques for the study of transient combustion eventsHerron, John R. 14 December 1989 (has links)
Techniques have been developed for measuring the
temperature, stable species concentrations, and atomic
radical concentrations during a transient combustion
event. They combine the features of direct sampling with
two spectroscopic techniques to produce relatively simple
diagnostic techniques to obtain time-resolved
measurements. In this study, a transient event was
provided by a propagating hydrogen/air flame. Stable
species were detected downstream of the sampling orifice
by electron impact fluorimetry, while temperatures and
atomic hydrogen concentrations were measured by atomic
resonance absorption spectroscopy. The calculation of
stable species concentrations from time-varying
fluorescence signals was straightforward, however
conversion from absorption measurements to temperatures
and atomic radical concentrations required the development
of a computer model of the radiation source and the
absorption by the sample. The model of the source was
validated by comparing predicted and recorded spectra of
hydrogen Lyman-α emissions, while the absorption model for
the sampled gas was tested by comparing the temperatures
predicted by absorption measurements with those recorded
at a range of known temperatures. These direct sampling
spectroscopic techniques minimize time-history distortions
inherent in other direct sampling techniques, and are
capable of tracking local temperatures and species
concentrations during the passage of a propagating flame
front. / Graduation date: 1990
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INVESTIGATIONS INTO NEW METHODS OF ANALYSIS BY ATOMIC AND MOLECULAR FLUORESCENCE AND FLAME EMISSIONSuddendorf, Ronald Frederick, 1949- January 1976 (has links)
No description available.
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INVESTIGATIONS INTO FLAME PROCESSES USING COMPUTER-CONTROLLED INSTRUMENTATIONRouth, Michael Wayne, 1947- January 1976 (has links)
No description available.
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Measurement of correlations involving pressure in a turbulent premixed flameWaldherr, Gregor Arthur 05 1900 (has links)
No description available.
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Measurements and modeling of non-premixed tubular flames structure, extinction and stability /Hu, Shengteng, January 1900 (has links)
Thesis (Ph. D. in Mechanical Engineering)--Vanderbilt University, Dec. 2007. / Title from title screen. Includes bibliographical references.
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Influence of certain cations on the intensities of spectral emissions observed in flame excitationWeaver, Robert Dunning. January 1955 (has links)
Call number: LD2668 .T4 1955 W43 / Master of Science
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Temperature measurement, electrical characteristics, and lorentz mixing of alkali seeded flamesPattee, Heidi Ann 23 January 1992 (has links)
When trace quantities of an alkali element are added to a flame,
its optical and electrical properties change significantly. Addition of
alkali seed to both premixed and diffusion flames has been used in the
development of two new techniques, one for flame temperature measurement
and the other for enhanced mixing.
Advantage has been taken of the spectral characteristics of alkali
seeds in the development of a non-invasive optical flame temperature
measurement technique. The strongest resonance line of alkalis is in
fact a doublet, and the two peaks can be subjected to different optical
treatment. A cesium-seeded flame was exposed to radiation which was
selectively filtered to yield different apparent source temperatures at
the wavelengths corresponding to the doublet resonance lines. The ratio
of the emission peak heights at the two wavelengths relates directly to
flame temperature. This technique allows real-time measurement of flame
temperatures up to 2800 K.
A second process has been investigated which takes advantage of the
enhanced electrical conductivity of alkali-seeded diffusion flames. The
study first required a characterization of electrical discharges through
planar diffusion flames. Because of the increase in conductivity,
alkali-seeded diffusion flames can carry current when a transverse
electric potential is applied. The behavior of diffusion flames
carrying electrical current has been investigated. The dependence on
electrode position and gap is reported and the behavior is contrasted
with that described in the literature for premixed flames.
A planar diffusion flame was subjected to a steady magnetic field
parallel to the flow direction while an orthogonal, oscillating current
passed through the flame sheet. A Lorentz body force was induced on the
flame sheet which acted to move it alternately toward the fuel and
oxidizer streams, improving bulk mixing in the flame. High-speed video
images of the oscillating flame were analyzed to obtain its maximum
lateral velocity. The results compared well with predictions from a
simple theoretical model. / Graduation date: 1992
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INVESTIGATION OF SPECTROSCOPIC PROPERTIES OF FLAMES AND PLASMAS VIA COMPUTER CONTROLLED INSTRUMENTATIONAlgeo, Donald John January 1981 (has links)
The Babington principle nebulizer, useful for the introduction of samples containing suspended solids, or having high viscosities, into flames or plasmas, has been developed and characterized. Smaller versions of the nebulizer have been shown to provide higher sensitivity and reduced memory relative to the larger devices used previously. Data showing the sensitivities observed with a Babington type nebulizer and a flame emission spectrophotometer at varying flow rates of both the nebulizing gas and the sample solution are presented, along with an evaluation of several nebulizer configurations and tip sytles. The effect of nebulizing gas orifice size upon sensitivity is discussed. Although the Babington principle nebulizer will tolerate samples of varying viscosity, the nebulization efficiency is affected by the sample solution viscosity. A Babington type nebulizer employing a sample heater has been constructed and evaluated using motor oils of differing grades, and has been shown to reduce the effect of viscosity for this class of samples. This heated Babington type nebulizer has been used to develop a method for the analysis of wear metals in oil which does not require sample pretreatment. The effect of polymeric viscosity index improving additives commonly added to motor oils on the sensitivity of the method has been explored, as well as the effect of different complexing agents which may be used in the preparation of standards. A new method is described for numerically evaluating the inverted Abel integral equation, used to extract information about interior regions of flames and plasmas from spatially resolved data obtained from side-on measurements. This method, based upon cubic spline approximations, is compared to modifications of two methods drawn from the literature over a range of data set sizes and with varying amounts of noise superimposed upon the signal. The results of this study give a basis for selecting the best method for transforming experimental data of varying quality, and also for estimating the reliability of the results of the computation. An appendix describes the design and development of an instrument, computer interface, and software package which allow spatial mapping of spectroscopic sources at high speed. Suggestions are given for future work in these areas.
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A molecular beam mass spectrometer study of fuel-rich and sooting benzene-oxygen flamesBittner, James D January 1981 (has links)
Thesis (Sc.D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1981. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIENCE. / Bibliography: leaves 936-960. / by James D. Bittner. / Sc.D.
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