Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 52 for “"Soot formation"”.
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Soot formation in laminar diffusion flames
Thesis: B.S., Massachusetts Institute of Technology, Department of Chemical Engineering, 1958
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Chemical and physical mechanisms of soot formation
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1989.
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Soot formation in vitiated-air diffusion flames
Soot volume fractions have been measured using optical techniques in dual mode diffusion flames. A dual mode flame is defined as a diffusion fuel jet that burns in the wake of a premixed flame. The premixed flame combustion products simulate a vitiated-air environment: the air is preheated, rich in …
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Flamelet modelling of soot formation in diffusion flames
… unsteady flamelet models have been applied to soot formation in laminar and turbulent diffusion flames. The aim was to study how different model parameters affect soot formation in diffusion flames. It was shown that certain assumptions are more crucial in laminar diffusion flames than in …
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The effects of metal additives on soot formation
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1990.
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Experimental and computational study of soot formation under diesel engine conditions
… has shown that during diesel combustion, soot is formed in local premixed fuel-rich regions. This project focuses on the fundamentals soot formation under fuel-rich conditions similar to those in diesel engine operation. Since these conditions cannot be easily reproduced in typical …
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Experimental and Numerical Studies on the Soot Formation of Liquid Fuel Relevant Compounds
… and numerical studies are performed for the soot formation of liquid fuel relevant compounds. The thesis is composed of four research studies. The first develops an improved data analysis approach for the combined laser extinction and two-angle elastic light scattering diagnostics to relate …
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Flow Field and Soot Formation Characteristics in Swirl-stabilized Non-premixed Turbulent Flames
Soot formation and evolution in relation with the flow fields were investigated experimentally in turbulent swirl-stabilized non-premixed flames using three different fuels: methane, ethanol and aviation Jet A-1. The studied flames were confined and stabilized in a model gas turbine combustor with …
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Laser induced incandescence imaging for the investigation of soot formation in laminar flames
… incandescence imaging for the measurement of soot concentration within a variety of novel flame sources and setups. Laser induced incandescence (LII) is an optical technique used in laser diagnostics to measure soot volume fraction and estimate particle size in-situ. Using imaging to measure …
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Soot formation in direct injection spark ignition engines under cold-idle operating conditions
… by offering a refined explanation of the soot formation process in direct injection engines under cold-idle operating conditions. A number of engine and rapid compression machine experiments were conducted in order to understand the impacts of engine operating conditions and fuel …
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An Experimental Study of Soot Formation in Dual Mode Laminar Wolfhard-Parker Flames
An experimental study of sooting characteristics of laminar underventillated ethylene non-premixed flames in hot vitiated environments was performed using a modified Wolfhard-Parker co-flowing slot burner. The burner could be operated in "single mode" with a cold air/oxygen mixture as the oxidizer …
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Combustion and soot formation modelling in modern gasoline direct injection engines using computational fluid dynamics
… Computational Fluid Dynamics (CFD) to model the formation of soot precursors in modern direct injection gasoline engines, with a particular emphasis on statistically efficient calibration of key sub-models. The research addresses the challenges associated with accurately representing combustion …
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Effects of Fuel Molecular Structure and Composition on Soot Formation in Direct-Injection Spray Flames
… was used as the base fuel to produce a non-sooting flame in a constant volume combustion vessel at 1000 K, and a density of 16.6 kg/m3. A second fuel was then added incrementally to determine an incipient soot limit. Line-of-sight extinction measurements were used as the primary diagnostic …
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PAH and soot formation and interconversion in turbulent coal liquid and natural gas diffusion flames
Thesis (Sc.D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1984.
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The effects of molecular structures and reactant temperatures on soot formation in a coflow laminar flame
… hydrocarbons and reactant temperatures on soot formation in a coflow diffusion flame. The study is motivated by the observation that soot formation is influenced by the flame boundary and ambient conditions, i.e. fuel species, pressure, temperature, etc. The effects of aromatic hydrocarbons …
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Investigation of Clean Diesel Combustion With Oxygenated Fuels in a Constant -Volume Combustion Chamber Using Forward Illumination Light Extinction Technique
The mechanism of soot reduction from oxygenated fuels was explored. DBM and TPME oxygenated fuels with 7% oxygen by weight were studied and have shown different soot reduction performances at different diesel combustion modes. In the premixed combustion mode, the higher oxygen efficiency from TPME …
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Experimental investigation on the effect of the combustion of oxygenated fuels on the formation of soot
… the potential pollutants (particularly soot) generated during the combustion of oxygenated fuel because of their distinct chemical composition when compared to fossil-based fuels. To have a through investigation on oxygenated fuel combustion and its impact on soot formation, three …
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In-Cylinder Soot Oxidation in an Optically Accessible Automotive Diesel Engine
The problematic soot emission of diesel engines is the net result of the competing in-cylinder formation and oxidation processes. Previous studies primarily focused on the soot formation, whereas the oxidation of soot particles remains an unexplored and least studied topic. To bridge this gap, this …
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