Laser Diagnostics Of Reacting Molecular Plasmas For Plasma Assisted Combustion Applications
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Author | : Caroline Winters |
Publisher | : |
Total Pages | : 228 |
Release | : 2017 |
Genre | : Aerospace engineering |
ISBN | : |
Download Laser Diagnostics of Reacting Molecular Plasmas for Plasma Assisted Combustion Applications Book in PDF, Epub and Kindle
This work has produced extensive sets of new data on low-temperature plasma-assisted fuel oxidation in hydrogen-oxygen-argon and hydrocarbon-oxygen-argon mixtures. The measurements have been made in two different plasma flow reactors, at an initial temperature of 500 K and pressures ranging from 300 Torr to 700 Torr. In both reactors, the plasma is generated by a high peak voltage, ns pulse discharge, operated at high pulse repetition rates (up to 20 kHz). Metastable Ar atom number density distributions in the discharge afterglow are measured by Tunable Diode Laser Absorption Spectroscopy (TDLAS), and used to characterize plasma uniformity. Temperature in the discharge-excited reacting flow is measured by Rayleigh scattering. Two-photon Absorption Laser Induced Fluorescence (TALIF) is used to measured absolute H and O atom number densities. The results are compared with predictions of a kinetic model analyzing reaction kinetics of excited species and radicals generated by the plasma at low temperatures and high pressures. The modeling predictions show good agreement with the data, with the exception of fuel-limited mixtures, when nearly all fuel available in the mixture of reactants is oxidized in the discharge. Kinetic modeling analysis identified dominant processes of generation and decay of atomic and radical species in the discharge and in the afterglow. At the present low-temperature conditions, the effect of chain branching reactions on plasma-assisted fuel oxidation kinetics is insignificant.
Author | : |
Publisher | : |
Total Pages | : 10 |
Release | : 1996 |
Genre | : |
ISBN | : |
Download Laser Diagnostics and Modeling of Plasma Assisted CVD. Final Technical Report Book in PDF, Epub and Kindle
Plasma assisted chemical vapor deposition (PACVD) represents a novel approach for utilizing the nonequilibrium effects of reactive plasmas for depositing a wide range of protective hardface coatings that have both wear and erosion application. The nonequilibrium plasma is the heart of this complex system and has the function of generating the reactive molecular fragments (radicals) and atomic species at concentration levels unattainable by other competing processes. It is now widely accepted that such advanced protective hardface coatings materials will play a vital role in the energy technologies of the coming decades, with major applications in diverse areas ranging from aerospace and commercial propulsion systems (jet engines) to automotive components and internal combustion engines, (ceramic heat engines), cutting and machining tools, electronic packaging, thermal management, and possibly room-temperature superconductors. Wear and associated erosion aspects are responsible for an enormous expenditure of energy and fiscal resources in almost all DOE applications. Many of the results from this investigation arc also applicable to other materials processing reactors such as electron beam, PVD, CVD, laser ablation, microwave, high energy cathodic arc, thermal plasma (rf or dc) and combustion spray. These also include the various hybrid systems such as the rf/dc arc as used in Japan for diamond deposition and e-beam PVD deposition of advanced titanium alloy coatings as used at the Paton Institute in Kiev, Ukraine.
Author | : Xing Rao |
Publisher | : |
Total Pages | : 133 |
Release | : 2010 |
Genre | : Electronic dissertations |
ISBN | : 9781124371467 |
Download Laser Diagnostics of Plasma Assisted Combustion Book in PDF, Epub and Kindle
Author | : K Muraoka |
Publisher | : CRC Press |
Total Pages | : 307 |
Release | : 2016-04-19 |
Genre | : Science |
ISBN | : 1420034065 |
Download Laser-Aided Diagnostics of Plasmas and Gases Book in PDF, Epub and Kindle
Updated and expanded from the original Japanese edition, Laser-Aided Diagnostics of Gases and Plasmas takes a unique approach in treating laser-aided diagnostics. The book unifies the subject by joining applications instead of describing each application as a totally separate system. In taking this approach, it highlights the relative strengths of
Author | : Orlando Auciello |
Publisher | : Academic Press |
Total Pages | : 470 |
Release | : 2013-10-22 |
Genre | : Science |
ISBN | : 1483216241 |
Download Plasma Diagnostics Book in PDF, Epub and Kindle
Plasma Diagnostics, Volume 1: Discharge Parameters and Chemistry covers seven chapters on the important diagnostic techniques for plasmas and details their use in particular applications. The book discusses optical diagnostic techniques for low pressure plasmas and plasma processing; plasma diagnostics for electrical discharge light sources; as well as Langmuir probes. The text also describes the mass spectroscopy of plasmas, microwave diagnostics, paramagnetic resonance diagnostics, and diagnostics in thermal plasma processing. Electrical engineers, nuclear engineers, microwave engineers, chemists, and technical personnel in universities, industry, and national laboratories will find the book invaluable.
Author | : Alan C. Eckbreth |
Publisher | : CRC Press |
Total Pages | : 636 |
Release | : 1996-10-10 |
Genre | : Technology & Engineering |
ISBN | : 9789056995324 |
Download Laser Diagnostics for Combustion Temperature and Species Book in PDF, Epub and Kindle
Focusing on spectroscopically-based, spatially-precise, laser techniques for temperature and chemical composition measurements in reacting and non-reacting flows, this book makes these powerful and important new tools in combustion research
Author | : N. G. Basov |
Publisher | : |
Total Pages | : 124 |
Release | : 2014-01-15 |
Genre | : |
ISBN | : 9781468416244 |
Download Research in Molecular Laser Plasmas Book in PDF, Epub and Kindle
Author | : Yupan Bao |
Publisher | : |
Total Pages | : |
Release | : 2022 |
Genre | : |
ISBN | : 9789189391574 |
Download Development of Optical Diagnostics of Plasma-related Phenomena and Applications Book in PDF, Epub and Kindle
Optical diagnostics techniques based on coded imaging were developed and applied for plasma-related phenomena and applications. The signal of interest is first encoded with a sinusoid pattern either by structured laser illumination or implement of a diffractive optical element, such as a grating, along the optical path of the signal. The coded signal will then be extracted from the raw data by a lock-in based algorithm, such as frequency recognition algorithm for multiple exposures (FRAME). Two types of non-thermal plasma sources, i.e., gliding arc discharges and nanosecond pulsed discharges, were investigated. Volumetric information of molecular distributions around a gliding arc was captured using laser-induced fluorescence with structured illumination and FRAME. Laser scattering imaging during the formation of a nanosecond pulsed discharge on a at methane-air flame was extracted from luminous plasma emission using structured laser illumination. Furthermore, a technique named periodic shadowing was applied for streak camera measurements, where both higher temporal contrast and effective dynamic range were achieved. The gliding arc plasma discharge was also applied in an industrial prototype burner as plasma-assisted combustion has been proven to be a promising technique to increase energy efficiency as well as reduce environmentally harmful emission. With the help of 0.1% additional energy, the lean blow-out limit of a hundred kilowatt burner was extended from a global equivalence ratio of 0.47 to 0.45.
Author | : Leon J. Radziemski |
Publisher | : CRC Press |
Total Pages | : 474 |
Release | : 2020-09-11 |
Genre | : Technology & Engineering |
ISBN | : 1000147371 |
Download Lasers-Induced Plasmas and Applications Book in PDF, Epub and Kindle
This book discusses the physics of plasma initiation and reviews the features of dissipating, propagating plasmas. It deals with advances in diagnostics for high-energy, laser-fusion plasmas. The book reviews the basic physical processes, plasma characteristics of the "continuous optical discharge".
Author | : |
Publisher | : |
Total Pages | : 37 |
Release | : 1997 |
Genre | : |
ISBN | : |
Download Nonlinear Laser Diagnostics for Combustion and Plasma Processes Book in PDF, Epub and Kindle
Significant milestones for quantitative laser-based diagnostics of reacting flows were reached on two separate tasks: (1) the extension of laser-based diagnostics to shorter vacuum ultraviolet (vuv) wavelengths and (2) the development of amplified spontaneous emission (ASE) diagnostics for light atoms. For the first task, phase-matching was applied to produce significant increases in vuv laser intensities, producing over 5 mu J at Lyman alpha (121.6 nm) in a mixture of krypton and argon. Factors affecting the long-term stability of vuv powers were studied. The diagnostic potential of two-photon excited ASE of atomic hydrogen and oxygen was explored in a variety of low-pressure flames. Direct ASE gain measurements gave oxygen concentrations. A model of the ASE signal was developed, and a new understanding of both ASE and laser-induced fluorescence of two-photon excited atoms emerged from this model.