Дисертації з теми "Flame particle"
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Urzay, Javier. "Theoretical studies in spiral edge-flame propagation and particle hydrodynamics." Diss., [La Jolla] : University of California, San Diego, 2010. http://wwwlib.umi.com/cr/ucsd/fullcit?p3398270.
Повний текст джерелаTitle from first page of PDF file (viewed May 6, 2010). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references.
Proust, Christophe. "Contribution à l'étude des mécanismes de propagation des flammes dans les mélanges hétérogènes gaz-particules solides." Poitiers, 1988. http://www.theses.fr/1988POIT2268.
Повний текст джерелаLi, Dan Chemical Sciences & Engineering Faculty of Engineering UNSW. "Designing functional magnetic nanoparticles with flame spray pyrolysis for bio-applications." Publisher:University of New South Wales. Chemical Sciences & Engineering, 2009. http://handle.unsw.edu.au/1959.4/43346.
Повний текст джерелаKerl, Johannes. "Development of a particle image velocimetry technique for three-dimensional flame structure analysis." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/18803.
Повний текст джерелаMarshall, Andrew. "Turbulent flame propagation characteristics of high hydrogen content fuels." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53859.
Повний текст джерелаBouvet, Nicolas. "Etude des vitesses fondamentales des flammes laminaires prémélangées : application aux mélanges méthane/air et syngas (H2/CO)/air." Thesis, Orléans, 2009. http://www.theses.fr/2009ORLE2078.
Повний текст джерелаIn the context of CO2 emission reduction, the present study is devoted to the development of alaminar flame speed measurement methodology, using the Digital Particle Image Velocimetry (DPIV)diagnostic. The latter is applied to stagnation flow flames, seen to have considerable assets for suchstudies. Indeed, flames stabilized in these diverging flows are planar, steady and in near-adiabaticconditions, while subtraction of strain effects on flame is intrinsically allowed. The methodology developedherein has been applied to the well-characterized methane/air mixtures for validation. An extensivecomparison with the literature datasets has been provided. Both 1D (PREMIX, OPPDIF) as well as 2D(Fluent©) numerical tools have been used to confirm the reliability and accuracy of the developed approach.A particular attention has been given to the characterization of the seeding particle motion within thediverging flow, with consideration of the often-neglected thermophoretic force. Fundamental flame velocitiesof various syngas (H2+CO) mixtures have been investigated using multiple experimental approachesincluding the aforementioned counterflow methodology as well as spherical and conical flameconfigurations. Performed measurements from the different approaches have been confronted and flamesensitivities to stretch have been characterized for a wide range of equivalence ratios (E.R.=0.4 to 5.0) andmixture compositions (5/95 to 50/50 % H2/CO)
Idris, Mahmoud [Verfasser]. "Two-Colour Pyrometer Technique for Coal-Particle Temperature Measurements in a Pulverised Coal Flame / Mahmoud Idris." Aachen : Shaker, 2004. http://d-nb.info/1181603501/34.
Повний текст джерелаMaugendre, Mathieu. "Etude des particules de suie dans les flammes de kérosène et de diester." Thesis, Rouen, INSA, 2009. http://www.theses.fr/2009ISAM0016/document.
Повний текст джерелаSoot are carbonaceous fine particles, which diameters are ranged from a few nanometres to a few micrometers. They have an impact on climate, due to their radiative properties, as well as on health, due to their small size. That’s why particulate matter is an important concern. In order to gain a better understanding of the influence of the combustion devices, which implies specific residence time and also specific turbulence, oxidation and pressure properties, we studied three specific kinds of combustion : first, laminar diffusion flames at atmospheric pressure ; then, a laminar diffusion flame a high pressures (3 to 5 bar) ; finally, a turbulent flame produced in a combustor at high pressures (1,2 to 3 bar). Another objective of this work was to improve the knowledge about soot produced by the combustion of liquid fuels, namely kerosene and biofuel. We studied morphological properties (fractal dimension, primary particle size…) and the refractive index m* of soot produced by these combustion systems. The technique employed to characterize the soot refractive index is based on the analysis of a part of smokes produced by flames. These are transported towards two optical cells, so that extinction and scattering coefficients can be measured, in addition to soot size distributions. Furthermore, a morphological characterization of the aggregates is conducted, using transmission electron microscopy (TEM) photographs. Rayleigh-Debye-Gans theory for fractal aggregates is used to determine two functions of the refractive index E(m) and F(m), so that m* can be deduced
Deng, Lei [Verfasser], and Andreas [Akademischer Betreuer] Kempf. "Numerical investigation of uncertainties in experiments for flame structure analysis and particle synthesis / Lei Deng ; Betreuer: Andreas Kempf." Duisburg, 2017. http://d-nb.info/1131551850/34.
Повний текст джерелаSeddon, Richard. "Influence of flame retardant additives on the processing characteristics and physical properties of ABS." Thesis, Loughborough University, 2000. https://dspace.lboro.ac.uk/2134/14228.
Повний текст джерелаWang, Zhong-Min. "Synthesis of Nanostructured Catalyst Powders and Thin Film Reactors by Flame Aerosol Deposition and Their Applications in Partial Oxidation." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1083637906.
Повний текст джерелаPinchak, Matthew D. "Enhanced Flame Stability and Control: The Reacting Jet in Vitiated Cross-Flow and Ozone-Assisted Combustion." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1522319737952261.
Повний текст джерелаValencia, Correa Andres. "Etude expérimentale des concentrations de suie et des vitesses dans une flamme de paroi verticale." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMR059/document.
Повний текст джерелаThe fire growth and spread on a confined space depends on the inflammation and combustion of combustible materials. An important case is the fire propagation on a vertical wall configuration, in which the pyrolysis gas and the total heat flux released by the flame are coupled by convective and radiative heat flux from the flame to the wall. This kind of flame is piloted by the buoyancy forces, and is characterized by a low velocity regime and a strong generation of soot particles. Although numerous works have been devoted on the study of vertical wall flames, few have been carried out on the analysis of the flame within the reactive boundary layer and the study of the zones of production of soot particles, which is data necessary for fire simulation codes validation. In this aim, simultaneous measurements of velocity by Particle Image Velocity (PIV) and of soot volume fraction by planar laser induced incandescence (LII) have been carried out on vertical wall fire generated by a vertical porous burner fed with a CH4/C2H4 mixture. First, the characteristics of soot sheet (shape, size, thickness, and peak concentration) have been studied at different heights into the flame, as well as the average and RMS soot volume fraction fields. Then, average and RMS fields of velocity and their probability density function have been analyzed. A description of the reactive boundary layer, through the definition of a characteristic velocity scale in the near-wall zone (viscous sub-layer), has been carried out by using a « PIV Zoom » set-up. Finally, simultaneous LII/PIV measurements have been carried out in order to study the influence of the aerodynamics of the flow on the soot volume fraction distribution, as well as the transport and turbulent flux of soot into the reactive boundary layer
AGASHE, NIKHIL R. "IN-SITU SMALL ANGLE X-RAY SCATTERING STUDIES OF CONTINUOUS NANO-PARTICLE SYNTHESIS IN PREMIXED AND DIFFUSION FLAMES." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1092055991.
Повний текст джерелаPetrosky, Brian Joseph. "Particle Image Velocimetry Applications of Fluorescent Dye-Doped Particles." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/52983.
Повний текст джерелаMaster of Science
Vaccaro, Danilo. "Experimental determination of burning velocity in metal dust explosions." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
Знайти повний текст джерелаHartl, Sandra. "Flamelet/progress variable modelling and flame structure analysis of partially premixed flames." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2017. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-227684.
Повний текст джерелаSeltz, Andréa. "Application of deep learning to turbulent combustion modeling of real jet fuel for the numerical prediction of particulate emissions Direct mapping from LES resolved scales to filtered-flame generated manifolds using convolutional neural networks Solving the population balance equation for non-inertial particles dynamics using probability density function and neural networks: application to a sooting flame." Thesis, Normandie, 2020. http://www.theses.fr/2020NORMIR08.
Повний текст джерелаWith the climate change emergency, pollutant and fuel consumption reductions are now a priority for aircraft industries. In combustion chambers, the chemistry and soot modeling are critical to correctly quantify engines soot particles and greenhouse gases emissions. This thesis aimed at improving aircraft numerical pollutant tools, in terms of computational cost and prediction level, for engines high fidelity simulations. It was achieved by enhancing chemistry reduction tools, allowing to predict CO emissions of an aircraft engines at affordable cost for the industry. Next, a novel closure model for unresolved terms in the LES filtered transport equations is developed, based on neural networks (NN), to propose a better flame modeling. Then, an original soot model for engine high fidelity simulations is presented, also based on NN. This new model is applied to a one-dimensional premixed sooted flame, and finally to an industrial combustion chamber LES with measured soot comparison
Arimboor, Chinnan Jacob. "Simulation and validation of in-cylinder combustion for a heavy-duty Otto gas engine using 3D-CFD technique." Thesis, KTH, Förbränningsmotorteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-245172.
Повний текст джерелаEmission from automobiles has been gaining importance for past few decades. This has gained a lot of impetus in search for alternate fuels among the automotive manufacturers. This led to the increase usage of Otto gas engine which uses natural gas as fuel. New engine designs have to be optimized for improving the engine efficiency. This led to usage of virtual simulations for reducing the lead time in the engine development. The verification and validation of actual phenomenon in the virtual simulations with respect to the physical measurements was quite important. The aim of this master thesis is to suggest the combustion model parameters after evaluating various combination of combustion and ignition models in terms of computational time and accuracy. In-cylinder pressure trace from the simulation is compared with the measurement in order to find the nest suited combination of combustion and ignition models. The influence of ignition timing, number of engine cycles and boundary conditions on the simulation results are also studied. Results showed that ECFM combustion model predicts the simulation results more accurately when compare to the measurements. Impact of ignition timing on various combination of combustion and ignition model is also assessed. Stability of various combustion simulation models is also discussed while running for more engine cycles. Comparison of computational time is also made for various combination of combustion and ignition models. Results also showed that the flame tracking method using Euler is dependent on the mesh resolution and the mesh quality. Recommendations and suggestions are given about the mesh and simulation settings for predicting the combustion simulation accurately. Some possible areas of improvement are given as future work for improving the accuracy of the simulation results.
Bodor, Agnes Livia. "Numerical modelling of soot formation and evolution in laminar flames with detailed kinetics." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLC050/document.
Повний текст джерелаAn image appearing when the phrase soot is heard is the smoke emitted by an exhaust pipe. The imperfect combustion of hydrocarbon fuels is a source of this harmful pollutant. The industrially controlled combustion of hydrocarbons can provide the carbon black, an industrial product widely used in our everyday life. For both its utilization and its harming effect, the surface of these combustion generated particles plays an important role, therefore, it is of interest to possess information on the particle morphology beside its mass or volume. Soot particles were found, at various conditions, to have a fractal-like structure built up from spherical shape building blocks, socalled primary particles. This increased interest in the particle surface and its evolution gives the motivation to extend numerical models to provide related information, i.e. particle surface or primary particle size. Furthermore, as the primary particle size influences the chemical and collisional processes, accounting for this parameter can improve the model predictions. The requirements for numerical models are various depending on the purpose of the simulation. Multidimensional laminar flames, like a laminar coflow diffusion flame, are less complex than flames of industrial combustion systems. However, the soot formation processes are analogous in the two cases, therefore, the investigation of these flames are of interest. In order to obtain a detailed description of the chemical processes, while keeping the computational cost in these flames at an affordable level, using chemical discrete sectional models is a suitable choice. As in their current version, these models do not provide information on the primary particle size their development in this direction is of interest. Guided by the above motivation, a numerical strategy to determine the primary particle size is presented in the context of the chemical sectional models. The proposed strategy is based on solving the transport equation of the primary particle number density for each considered aggregate section. In order to validate numerical primary particle size, the comparison to experimental data is required. Due to its numerous advantages, the Time-Resolved Laser-Induced Incandescence (TiRe-LII) technique is a nowadays popular experimental method. However, the comparison of the numerically and the experimentally obtained primary particle size may be charged with uncertainties introduced by the additional measurements or assumptions of the numerous parameters required to derive primary particle size from the detected signal. In order to improve the validation strategy, an additional approach for primary particle size distribution validation with TiRe-LII is proposed. This is based on the reconstruction of the temporal evolution of incandescence from the numerical results and its comparison with the measured signal. The effectiveness of this ’forward’ method is demonstrated a priori by quantifying the errors potentially avoided by the new strategy. The validity of the proposed primary particle tracking model is tested by both the traditional ’inverse’ and the ’forward’ method on target flames of the International Sooting Flame (ISF) Workshop. In particular a laminar premixed ethylene flame is considered first. Then, two laminar coflow ethylene flames with different dilutions are put under the scope. The sensitivity to the model parameters, such as accounting for the surface rounding and the choice of smallest aggregating particle size, is explored in both the premixed flame and in the coflow flame with highest ethylene content. To understand the effect of the fuel stream dilution on the primary particle size in the coflow flame, first, the flame-flow interaction and the effect of the dilution on the flame structure is investigated. [...]
Grady, Keith J. "Solar flare particle acceleration in collapsing magnetic traps." Thesis, University of St Andrews, 2012. http://hdl.handle.net/10023/2839.
Повний текст джерелаBattaglia, Marina. "Particle kinematics in solar flares : observations and theory /." Göttingen Cuvillier, 2008. http://d-nb.info/992806011/04.
Повний текст джерелаTeleki, Alexandra. "Flame synthesis and coating of nanostructured particles in one step." kostenfrei, 2008. http://e-collection.ethbib.ethz.ch/view/eth:30778.
Повний текст джерелаMerlo, Nazim. "Caractérisation expérimentale d’une flamme turbulente non prémélangée swirlée : effet de l’enrichissement en oxygène." Thesis, Orléans, 2014. http://www.theses.fr/2014ORLE2058/document.
Повний текст джерелаThis thesis is a contribution to the study of turbulent non-premixed swirling methane flames with or without oxygen addition in the oxidizer. The study deals with the flame stability, the pollutant emissions and the jet dynamic behaviour in non-reacting and reacting conditions. The burner, operating in a combustion chamber, consists of two concentric tubes with a swirler placed in an annular arrangement, which supplied the oxidant flow (air or oxygen-enriched air). The central pipe delivers fuel (methane) radially just below the burner exit plane. The oxygen content in the oxidizer, the geometric swirl number and the global equivalence ratio are the main parameters, which can be precisely set. OH* chemiluminescence imaging is used to characterize flame stability. Multi-gas analyzers are used to measure pollutant emissions in the exhaust gas. The flow is characterized using stereoscopic PIV measurements in different longitudinal and transverse planes. A qualitative study dealing with the methane diffusion imaging is also conducted by use of acetone planar laser-induced fluorescence. Up to now only few studies have examined the dynamic behavior of this type of swirled flames with oxygen addition. Introducing swirl allows creating a central recirculation zone which favors lean flame stabilization at higher Reynolds numbers. The mapping of the combustion regimes combined with the pollutant emission results show that the stable lifted flames are related to high CO and residual CH4 emission levels in the exhaust gas. Oxygen addition, even by a few percent, allows improving CO and unburned hydrocarbons conversion and increasing flame stability at the same time via a decrease of liftoff heights and the related fluctuations. The NOx emissions increase via the thermal pathway with increasing the oxygen-enrichment rate up to 30 % vol. A comparative study in non-reacting and reacting conditions is conducted to give insight into the tridimensional flow field topology varying the above-mentioned parameters. Mean streamwise velocity and swirl number decay rates show the flame effects on the flow dynamics. A coupling mechanism between the entrainment rate of the surroundings via the external recirculation and the pollutant emissions is proposed to explain the NOx emission trend with the global equivalence ratio. A model is also proposed based on the helical vortices to identify the main features of helix structures in the jet in non-reacting and reacting conditions
Roussillo, Mathieu. "Development of optical diagnostics for soot particles measurements and application to confined swirling premixed sooting flames under rich conditions." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLC060/document.
Повний текст джерелаThe control of soot particles production represents today a major industrial issue because of their harmful impact on both the climate and the human health and their strong contribution to the radiative transfers. To better understand and control the production of these polluting emissions, it is essential to improve our knowledge on this subject in a turbulent burner. The objective of this Ph.D. is to set up optical diagnostics for the study of turbulent flames and to experimentally characterize soot production in a new academic turbulent premixed combustion configuration while approaching industrial configurations, generally confined and swirled flows. For this, a laminar experimental configuration is first considered to validate the implementation of the Laser Induced Incandescence (LII) technique to measure the soot volume fraction fv. This burner designed at Yale University allows the stabilization of a laminar ethylene/air diffusion flame. This burner has been widely studied in the literature, so that it is possible to compare the quality of our measurements with the results of different international teams. Through collaborations with the UPMC, we calibrated the LII signal with the MAE (Modulated Absorption Emission) technique, making it possible to quantitatively measure fv and to compare the MAE and LII techniques. Finally, the burner was equipped with a loudspeaker to modulate the flow and to study the effects of a controlled perturbation on the soot production, thus approaching the unsteady phenomena characteristics of turbulent flows. Finally, the effects of the enlargement of the laser sheet on LII results were also investigated in order to be able to apply this diagnostic technique in an innovative large turbulent configuration. This experimental configuration, called EM2Soot, was developed to measure the production of soot in a turbulent swirled rich confined premixed ethylene/air flame. This burner makes it possible to independently quantify the effects of the equivalence ratio, the total flame power and the thermal environment on the total soot production. A representative operating point was then characterized, in parallel with LII measurements, Particle Image Velocimetry (PIV) and Laser Induced Phosphorescence (LIP) techniques have been employed in order to characterize the effect of the turbulence on soot production and to establish a database for the validation of future numerical simulations. Finally, the geometry of the burner has been modified allowing a different stabilization of the flame (V flame shape). A new operating point is then studied in order to highlight the role of the injector geometry on the stabilization of the flame and, consequently, on the total soot production
Potier, Bruno. "Détermination des champs des températures et des concentrations dans une flamme de charbon pulvérisé de taille semi-industrielle : application au four pilote 1 mw du cerchar." Orléans, 1986. http://www.theses.fr/1986ORLE0012.
Повний текст джерелаLecordier, Bertrand. "Etude de l'interaction de la propagation d'une flamme prémélangée avec le champ aérodynamique, par association de la tomographie laser et de la vélocimétrie par images de particules." Rouen, 1997. http://www.theses.fr/1997ROUES060.
Повний текст джерелаGai, Guodong. "Modeling of water sprays effects on premixed hydrogen-air explosion, turbulence and shock waves Modeling pressure loads during a premixed hydrogen combustion in the presence of water spray Numerical study on laminar flame velocity of hydrogen-air combustion under water spray effects Modeling of particle cloud dispersion in compressible gas flows with shock waves A new formulation of a spray dispersion model for particle/droplet-laden flows subjected to shock waves Particles-induced turbulence: a critical review of physical concepts, numerical modelings and experimental investigation A new methodology for modeling turbulence induced 1 by a particle-laden flow using a mechanistic model." Thesis, Normandie, 2020. http://www.theses.fr/2020NORMIR14.
Повний текст джерелаThis PhD dissertation is dedicated to develop simple models to investigate the effect of water spray system on the premixed hydrogen-air combustion in the nuclear power plants. Specific simple models are developed to describe the water droplet evaporation in the flame, particle cloud dispersion after the shock wave passage, and turbulence length scale evolution with the presence of a water spray. A methodology is proposed to evaluate the spray evaporation effects on the propagation of the turbulent hydrogen flame inside a closed volume and a simple model is developed for the quantification of the laminar velocity deceleration with the droplets evaporation inside the flame. An analytical model is proposed for the prediction of particle cloud dispersion after the shock passage in the one-way formalism and another analytical model is dedicated to describe the spray-shock interaction mechanism and predict the appearance of a particle number density peak using the two-way formalism. A review of the important criteria and physical modelings related to the particle-induced turbulence modulation is given and a mechanistic model is used for the estimation of the turbulent integral length scales induced by the injection of particle clouds. These developed numerical models can be coupled to implement in the large-scale numerical simulations of the spray system effects on the accidental hydrogen explosions in the nuclear power plants
Chong, Kin Hung. "Modelling and simulation of particle formation in laminar flames." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336552.
Повний текст джерелаMukundan, Mallika. "Phase control in the synthesis of yttrium oxide nano and micro-particles by flame spray pyrolysis." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-1568.
Повний текст джерелаHamilton, Brian. "Particle acceleration in dynamically reconnecting X-point solar-flare models." Thesis, University of Glasgow, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.425388.
Повний текст джерелаKim, Kibum. "Interaction of iron species and soot particles in an isooctane diffusion flame." [Gainesville, Fla.] : University of Florida, 2006. http://purl.fcla.edu/fcla/etd/UFE0015080.
Повний текст джерелаShum-Kivan, Francis. "Simulation des Grandes Echelles de flammes de spray et modélisation de la combustion non-prémélangée." Phd thesis, Toulouse, INPT, 2017. http://oatao.univ-toulouse.fr/18064/1/Shum_Kivan_Francis.pdf.
Повний текст джерелаYin, Chung-Yuan. "Soot particle size measurements in laminar premixed ethylene flames with laser-induced incandescence and scanning mobility particle sizer." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2009. http://wwwlib.umi.com/cr/ucsd/fullcit?p1460029.
Повний текст джерелаTitle from first page of PDF file (viewed January 9, 2009). Available via ProQuest Digital Dissertations. Includes bibliographical references (p. 46-48).
Stanier, Adam. "Magnetic reconnection and particle acceleration in semi-collisional plasmas." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/magnetic-reconnection-and-particle-acceleration-in-semicollisional-plasmas(26c3b17d-87ca-4d98-b5b5-3a3d78e0dd03).html.
Повний текст джерелаXie, Yanxuan. "Study of Interaction of Entrained Coal Dust Particles in Lean Methane-Air Premixed Flames." Digital WPI, 2011. https://digitalcommons.wpi.edu/etd-theses/1065.
Повний текст джерелаWinter, Henry deGraffenried III. "Combining hydrodynamic modeling with nonthermal test particle tracking to improve flare simulations." Thesis, Montana State University, 2009. http://etd.lib.montana.edu/etd/2009/winter/WinterH0509.pdf.
Повний текст джерелаLee, Minkyu. "Influence of the Reactant Temperature on Particle Entrained Laminar Methane-Air Premixed Flames." Digital WPI, 2014. https://digitalcommons.wpi.edu/etd-theses/623.
Повний текст джерелаKarakaya, Yasin Hüseyin [Verfasser], and Tina [Akademischer Betreuer] Kasper. "Mass spectrometric gas phase diagnostics in particle forming flames / Yasin Karakaya ; Betreuer: Tina Kasper." Duisburg, 2021. http://d-nb.info/1237221439/34.
Повний текст джерелаMihalik, Teresa Ann. "The quenching of gaseous hydrocarbon-air flames in packed beds of spherical particles /." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33337.
Повний текст джерелаThe flame quenching limits are found to be relatively insensitive to the material of the solid spheres, but are dependent on the sphere size through a characteristic length scale that describes the open passages of the packed bed. Flame extinction was always observed to occur within a few millimeters of penetration into the packed bed section indicating that the length of the packed bed has little influence on the quenching of laminar flames. Analysis of the experimental results indicates that the mechanism for flame quenching in a packed bed is governed primarily by heat loss to the sphere surfaces by conduction, convection effects being negligible in the small channels of the packed bed. It is shown that, while conduction is the dominant flame quenching mechanism, selective diffusion and flame stretch also play an important role in the quenching process.
Casey, Linda J. "Changes in wood-flake properties in relation to heat, moisture, and pressure during flakeboard manufacture." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/101369.
Повний текст джерелаM.S.
Bansal, Nakul Raj. "Characterization of kinematic properties of turbulent non-premixed jet flames using high-speed Particle Image Velocimetry." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1502968666691545.
Повний текст джерелаLabor, Serge. "Etude expérimentale d'une flamme de diffusion oxygène-hydrogène ensemencée en particules solides d'alumine." Ecully, Ecole centrale de Lyon, 2003. http://bibli.ec-lyon.fr/exl-doc/slabor.pdf.
Повний текст джерелаMonocristalline sapphire microspheres are generated through the melting of alumine (AL203) particles in a flamme. The alumina particles are injected in a very peculiar 02/H2 confinened diffusion flame as it is a downwards vertical flame having fuel in periphery of a central powdered oxygen jet. Quantitative measurements were carried out (ADL, PIV) and supplemented by a numerical study (N3S-Natur). (1) The laminar behavior of the isothermal conditions is kept through reactive flow. Therefore, particles will mainly collide due to spedd gradients. (2) It has been shown that an axial particle will have a transit time int the high temperature zone very different to that of an off-line one. (3) The PIV date proved that the particle density was not homogeneous. (4) The hydrogen jet hardly influences the flame aerodynamic structure. Conversly, the central oxygen jet is at premium due to its effect on both the flame speed and temperature distribution
Labor, Serge Escudié Dany. "Etude expérimentale d'une flamme de diffusion oxygène-hydrogène ensemencée en particules solides d'alumine." [S.l.] : [s.n.], 2003. http://bibli.ec-lyon.fr/exl-doc/slabor.pdf.
Повний текст джерелаYao, Qifeng. "Experimental Investigation and Statistical Analysis of Entrainment Rates of Particles in Suspended Load." Kyoto University, 2019. http://hdl.handle.net/2433/244513.
Повний текст джерелаEscudero, Barros Felipe Andrés. "Experimental and numerical contributions to soot production in laminar axisymmetric diffusion flames." Thesis, Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0048.
Повний текст джерелаAn experimental study was performed with the main objective of characterizing soot production for different oxygen indices (OIs) in normal (NDFs) and inverse (IDFs) diffusion flames. Specific absorption-emission based methods were developed, implemented and validated to measure soot volume fraction and temperature. It was found that for IDFs, an increase on the OI produces an enhancement of soot formation but does not affect oxidation processes, leading to an increase on soot volume fraction and radiant fraction. In addition, a scaling analysis based on the smoke point (SP) resulted on a unified behavior for ethylene, propane and butane fueled NDFs in terms of flame height, soot volume fraction and radiant fraction at SP. In a second step, a numerical study was performed with the main objective of evaluating the predictive capabilities of the sectional method (SM) and three methods of moments (MOMs) for the resolution of the population balance equation (PBE) for soot particle size distribution (PSD). For this purpose, the MOMs were added to an existing parallel code for simulating laminar axisymmetric diffusion flames. The SM was able to reproduce the available experimental data whereas the MOMs were not able to predict details of soot morphology with the same level of accuracy. An analysis on the main differences between the SM and MOMs was performed. The main issue identified for the MOMs was the inability to satisfy the assumption of conservation of number density of primary particles and number of primary particles per aggregate during soot surface processes
石井, 大祐, Daisuke ISHII, 祐二 中村, Yuji NAKAMURA, 直樹 林, Naoki HAYASHI, 和弘 山本, Kazuhiro YAMAMOTO, 博史 山下 та Hiroshi YAMASHITA. "部分予混合化によるPAHs抑制メカニズムの検討". 日本機械学会, 2006. http://hdl.handle.net/2237/9368.
Повний текст джерелаLe, Dortz Romain. "Détermination des caractéristiques fondamentales de combustion de pré-mélange air-kérosène, de l’allumage à la vitesse de flamme : représentativité de surrogates mono et multi-composants." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2018. http://www.theses.fr/2018ESMA0008/document.
Повний текст джерелаWith air traffic expected to soar in the next few years, the impact of civil aviation on the environment is a major issue. International environmental organizations such as ACARE (the Advisory Council for Aeronautical Research and Innovation in Europe), in partnership with the main international aeronautical groups, have set drastic objectives to preserve the environment: a reduction of 75 % of CO2emissions and a reduction of 90 % of nitrogen oxide emissions into the atmosphere are sought by 2050, with reference to aircraft produced at the beginning of the 21st century. Current turboshaft engines have a very high degree of maturity and may not achieve these objectives. Engineers are therefore aiming to study new concepts that will become technological breakthroughs at the 2050 horizon, such as detonation engines or constant volume combustion engines. Currently, the physical phenomena associated with the combustion of kerosene in those kinds of engines are still poorly documented. The objective of this PhD thesis is to contribute to the improvement of the knowledge and understanding of these physical phenomena. In this work, premixed flames of kerosene and air are experimentally studied with optical diagnostics (Schlieren, PIV) and metrology techniques. The combustion process is here studied in thermodynamic conditions similar to those encountered in an aeronautical engine. First, the propagation phaseis analyzed in laminar and adiabatic conditions through the determination of the unstretched laminar burning velocity, which drives the combustion process. Then, in a second stage, the sensitivity of the flame front to stretch and the formation of combustion instabilities are examined. Finally, the ignition phase of premixed flames of kerosene and air under critical aerodynamic conditions is also investigated. A second issue tackled in this work is the reproduction of a real kerosene by a surrogate made up of a limited number of species, to simplify industrial problems and initial studies. Indeed, the composition of a commercial kerosene is complex and can vary, and the use of a surrogate allows an easier numerical simulation of the combustion process. The relevance of some more or less representative surrogates, formulated in the literature and elaborated all through different studies, is also studied in this thesis, by comparing the results obtained with those of a commercial kerosene. In addition, the modelling of those surrogates by a valid chemical kinetic mechanism is also analyzed. This research was conducted within the CAPA industrial Chair project dedicated to innovative combustion modes for air-breathing propulsion, financially supported by SAFRAN Tech, MBDA and France’s ANR national research agency
Verdier, Antoine. "Experimental study of dilute spray combustion." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMIR27/document.
Повний текст джерелаLiquid fuels are the primary energy source in a wide range of applications including industrial and residential furnaces, internal combustion engines and propulsion systems. Pollutant emission reduction is currently one of the major constraints for the design of the next generation combustion chamber. Spray combustion involves many complex physical phenomena including atomization, dispersion, evaporation and combustion, which generally take place simultaneously or within very small regions in the combustion chambers. Although numerical simulation is a valuable tool to tackle these different interactions between liquid and gas phases, the method needs to be validated through reliable experimental studies. Therefore, accurate experimental data on flame structure and on liquid and gas properties along the evaporation and combustion steps are needed and are still challenging. A joint effort between numerical and experimental teams is necessary to meet tomorrow's energy challenges and opportunities. The complexity of the real aeronautical configurations implies to study the effect of local properties in flame dynamics on a canonical configuration, which presents the essential feature of very well defined boundary conditions. This work, carried out within the framework of the ANR TIMBER project, aims to improve the understanding of two-phase flow combustion, as well as to produce an efficient and original database for the validation of the models used in LES
Ulianova, V. O., A. T. Orlov, and O. V. Bogdan. "Formation of ZnO Nanostructured Thin Film by Hydrothermal Method." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35191.
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