EBookClubs

Read Books & Download eBooks Full Online

EBookClubs

Read Books & Download eBooks Full Online

Book An Experimental Investigation of the Ignition and Combustion Phenomena of Laser ignited Boron Agglomerates in a Flowing Oxygen Environment

Download or read book An Experimental Investigation of the Ignition and Combustion Phenomena of Laser ignited Boron Agglomerates in a Flowing Oxygen Environment written by Chris B. Schechter and published by . This book was released on 1990 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Masters Theses in the Pure and Applied Sciences

Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS)* at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dis semination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the though that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volumes were handled by an international publishing house to assure improved service and broader dissemi nation. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 37 (thesis year 1992) a total of 12,549 thesis titles from 25 Canadian and 153 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this impor tant annual reference work. While Volume 37 reports theses submitted in 1992, on occasion, certain uni versities do report theses submitted in previous years but not reported at the time.

Book Masters Theses in the Pure and Applied Sciences

Download or read book Masters Theses in the Pure and Applied Sciences written by W. H. Shafer and published by Springer Science & Business Media. This book was released on 1994 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 37 (thesis year 1992) reports a total of 12,549 thesis titles from 25 Canadian and 153 US universities (theses submitted in previous years but only now reported are indicated by the thesis year shown in parenthesis). The organization, like that of past years, consists of thesis titles arrange

Book Experimentelle und numerische Untersuchung der Flammenentwicklung bei Laserentz ndung von Methan Sauerstoff Gemischen in Modellbrennkammern

Download or read book Experimentelle und numerische Untersuchung der Flammenentwicklung bei Laserentz ndung von Methan Sauerstoff Gemischen in Modellbrennkammern written by Michael Wohlhüter and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Ignition and Combustion of Single Boron Particles in Air at Ambient Pressure

Download or read book The Ignition and Combustion of Single Boron Particles in Air at Ambient Pressure written by William H. McLain and published by . This book was released on 1970 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental and theoretical studies are reported which provide basic information concerning the ignition and combustion processes of amorphous, crystalline, gamma-irradiated, and LiF coated single boron particles. All studies were conducted at ambient pressure with particles or particle agglomerates between 30 and 50 microns in diameter. Boron particles were suspended in a levitation cell and ignited using a pulsed neodymium-doped laser. The burning processes were recorded in either self-light or shadowgraph. Within experimental error the burning time for amorphous boron and spherodized crystalline boron are the same indicating that the initial particle character has a minor effect on the liquid droplet burning time combustion process. Analytical studies were made concerning the unsteady heating of boron particles subjected to high flux rates. The theory of nonequilibrium thermodynamics is explored and it is demonstrated that engineering calculations based on the equilibrium hypothesis may predict mass flux rates 50 to 100 percent in error. (Author).

Book Laser based Investigation of Gas and Solid Fuel Combustion under Oxy Fuel Atmosphere

Download or read book Laser based Investigation of Gas and Solid Fuel Combustion under Oxy Fuel Atmosphere written by Sebastian Bürkle and published by BoD – Books on Demand. This book was released on 2019-03-04 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Oxy-fuel combustion has the potential to reduce the atmospheric CO2-emissions of fossil fuel power plants by burning gaseous or solid fuels under an atmosphere of carbon dioxide and oxygen. The combustion under oxy-fuel operating conditions, however, is accompanied by major changes in the combustion behavior. The underlying chemical and physical processes are complex and highly coupled, which impedes investigations and modeling. Since tactile and most of the optical measurement techniques fail under the sensitive and simultaneously harsh environments of oxy-fuel combustion, an optical in-situ measurement system based on tunable diode laser absorption spectroscopy is developed in this work. This system allows to investigate the thermochemical state of combustion gases with respect to the quantitative concentrations of multiple combustion-relevant gases and the gas temperature. In combination with a newly developed and applied measurement strategy, the system even allows for a measurement of the gas residence time distribution. To improve the measurement accuracy, multiple absorption line parameters are experimentally determined. The measurement system is applied to three oxy-fuel combustion systems. First, the thermochemical state of the laminar, non-premixed methane combustion under oxy-fuel atmosphere is studied. The turbulent, premixed combustion of the same fuel under air and two oxy-fuel atmospheres is studied in a 20 kWth swirled combustor. Measurements of the residence time distribution of fluids in the combustion chamber provide insights into mixing and transport properties of the flow. The thermochemical state reveals insights into the reaction progess and flow mixing. Co-firing of three different solid fuels in an assisting gas flame is investigated for a combined thermal power up to 40 kWth. Here, the char burnout of the particles is investigated. The thermochemical state of the combustion of pure torrefied biomass under air and oxy-fuel combustion atmosphere is investigated in a 60 kWth close-to-application facility and compared to equillibrium calculations.

Book Combustion of Boron Particles Experiment and Theory

Download or read book Combustion of Boron Particles Experiment and Theory written by Andrej Macek and published by . This book was released on 1962 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary purpose of the work was measurement of burning times of single boron particles as functions of three experimental variables: particle diameter d from 37 to 124 micrometers, pressure P from 0.17 to 35.0 atm, and mole fraction of oxygen in gas X from 0.1 to 1.0. Limited studies were also made in fluorine-containing gases without oxygen. The experiments were done by a previously described laser-ignition technique. In oxygen-containing gases measurable pre-ignition delays were observed, except at low pressures; they were not observed in the absence of oxygen. The effect of convection in these free-fall experiments was found to be significant at large values of d and P, and had to be taken into account in interpretation of the data. When d, P, and X are sufficiently high, the burning times are found to be inversely proportional to X, directly proportional to d squared, and independent of P. At low values of these parameters, burning times deviate from these scaling laws. (Author).

Book Boron Particle Ignition and Combustion in Hydrogen Oxygen Products

Download or read book Boron Particle Ignition and Combustion in Hydrogen Oxygen Products written by Rodney Lane Burton and published by . This book was released on 1997 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Laser Induced Spark Ignition of Methane Oxygen Mixtures

Download or read book Laser Induced Spark Ignition of Methane Oxygen Mixtures written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-12-31 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results from an experimental study of laser induced spark ignition of methane-oxygen mixtures are presented. The experiments were conducted at atmospheric pressure and 296 K under laminar pre-mixed and turbulent-incompletely mixed conditions. A pulsed, frequency doubled Nd: YAG laser was used as the ignition source. Laser sparks with energies of 10 mJ and 40 mJ were used, as well as a conventional electrode spark with an effective energy of 6 mJ. Measurements were made of the flame kernel radius as a function of time using pulsed laser shadowgraphy. The initial size of the spark ignited flame kernel was found to correlate reasonably well with breakdown energy as predicted by the Taylor spherical blast wave model. The subsequent growth rate of the flame kernel was found to increase with time from a value less than to a value greater than the adiabatic, unstretched laminar growth rate. This behavior was attributed to the combined effects of flame stretch and an apparent wrinkling of the flame surface due to the extremely rapid acceleration of the flame. The very large laminar flame speed of methane-oxygen mixtures appears to be the dominant factor affecting the growth rate of spark ignited flame kernels, with the mode of ignition having a small effect. The effect of incomplete fuel-oxidizer mixing was found to have a significant effect on the growth rate, one which was greater than could simply be accounted for by the effect of local variations in the equivalence ratio on the local flame speed. Santavicca, D. A. and Ho, C. and Reilly, B. J. and Lee, T.-W. NASA-CR-188689, NAS 1.26:188689 NAG3-966...

Book Ignition and Combustion of Boron Particles in Hydrogen oxygen Explosion Products

Download or read book Ignition and Combustion of Boron Particles in Hydrogen oxygen Explosion Products written by R. O. Foelsche and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Boron Combustion Product Chemistry

Download or read book Boron Combustion Product Chemistry written by William J. Miller and published by . This book was released on 1976 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study comprises an experimental investigation of the chemistry of boron combustion products with particular emphasis on the phenomena preceding and accompanying nucleation in expanding flows. Supersonic (Mach number =3) jets of the burnt gases from H2/O2/N2 flames seeded with BC13 were examined using laser light scattering and a mass spectrometer equipped with a modulated molecular beam sampling system. The results demonstrate that the processes by which the primary combustion product HBO2 is converted to condensed phase jet constituents such as B2O3(liquid) are not interpretable via models based on conventional homogeneous nucleation theories. (Author).

Book Combustion of Boron Particles at Elevated Pressures

Download or read book Combustion of Boron Particles at Elevated Pressures written by Andrej Macek and published by . This book was released on 1970 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: Combustion of single boron particles, about 75 microns in diameter, from a crystalline powder sample has been studied. Particles were ignited by being dropped through a focused laser beam in several oxidizing gases over a range of pressures. In pure oxygen, in air, and in O2/Ar(20/80), particles were merely preheated to a temperature about 2000K; ignition took place spontaneously after a measurable induction period. Quantitative values of both the induction period and the subsequent self-sustained combustion period are listed. It was shown that the classical theory of ignition and combustion can account for all three observed burning modes: metastable surface reaction during the preignition period, rapid self-sustained diffusion-combustion, and decaying combustion. Previously reported reaction-rate and ignition-limit data were used for quantitative estimates of parameters pertaining to the three regimes. (Author).