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 16 of 16 for “"Non-Premixed Flames"”.
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Extinction in turbulent swirling non-premixed flames
… and global extinction in turbulent swirling non-premixed flames with Large Eddy Simulation (LES) and sub-grid scale Conditional Moment Closure (CMC) model. The first part of this thesis describes the derivations of the three dimensional conservative CMC governing equations and their finite …
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Bio-butanol fuel atomization and combustion processes
… namely butanol electrostatic sprays, butanol non-premixed flames, and butanol kinetic modeling in view of the emergence of methods of production of this fuel from biological sources. Butanol electrospray (e-spray) phenomenology was investigated through high-speed visualization and compared …
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Flame Stabilisation in the Transition to MILD Combustion
… investigated experimentally and numerically in premixed reactors and non-premixed flames. In this study, definitions of MILD combustion are compared and contrasted, with the phenomenological premixed description of MILD combustion extended to describe non-premixed flames. A simple criterion is …
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A Parallel Solution-Adaptive Method for Turbulent Non-Premixed Combusting Flows
… and applied to the predictions of turbulent non-premixed compressible combusting flows for both two and three space dimensions. The parallel solution-adaptive algorithm solves the system of partial-differential equations governing turbulent compressible flows of reactive thermally perfect …
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Experimental investigation of coal combustion in coal-laden methane jets
… by analyzing the particle size distribution for premixed and non-premixed flames. Loose density measurements and Fraunhofer-diffraction-based particle size distribution measurements were carried out before and after combustion in order to characterize the effect of combustion on the …
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Flow Field and Soot Formation Characteristics in Swirl-stabilized Non-premixed Turbulent Flames
… 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 a swirl number of ~0.55. Soot volume fraction, fv, and primary soot …
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Large Eddy Simulation of Boundary Layer Combustion
Numerical simulations of turbulent non-premixed flames occurring in the presence of solid surfaces is a prevalent topic of interest due to the complexity of the near wall physics and the technical modeling challenges it presents. Near wall combustion phenomena is relevant in a variety of combusting …
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An Experimental Study of Soot Formation in Dual Mode Laminar Wolfhard-Parker Flames
… 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 for the non-premixed flame or in …
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Reduced Kinetic Mechanisms For Premixedhydrogen-air-cf3br Flames
… significantly reduced the burning velocity of premixed H2/Air flames by depleting the important radical species that are important to sustain chemical reactions. Extending this finding to understand the suppression of more complicated diffusion flames and unsteady three dimension turbulent …
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Modelling of Spray Combustion with Doubly Conditional Moment Closure
… of combustion regimes, where self-propagating premixed flames and diffusion-controlled non-premixed flames may occur simultaneously within the same flame. The physical processes involved in spray combustion and their interaction take place over a broad range of scales, which makes their …
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Flame Structure and Emissions of Strongly-Pulsed Turbulent Diffusion Flames with Swirl
… and the exhaust emissions of strongly-pulsed, non-premixed flames with co-flow swirl. The fuel injection is controlled by strongly-pulsing the fuel flow by a fast-response solenoid valve such that the fuel flow is completely shut off between pulses. This control strategy allows the fuel …
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Numerical simulations of ion transport membrane oxy-fuel reactors for CO₂ capture applications
… of a flame) of laminar oxy-fuel diffusion flames stabilized on the sweep side. The nature of oxygen permeation does not enable pre-mixing of fuel and oxidizer (i.e., sweep gas and permeated oxygen), establishing non-premixed flames. In oxy-fuel combustion applications, the sweep side is …
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Lean Premixed Prevaporised Combustion for Microturbines
… strategy to meet these requirements is the lean premixed prevaporised (LPP) concept. Thus, this thesis explores the fuel flexibility, flame stability, structures, gas emissions, and droplet behaviour in LPP combustion at conditions relevant for microturbines. The first part of the thesis examines …
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Predicting Soot Emissions with Advanced Turbulent Reacting Flow Modelling
… can replicate soot emissions and size in laminar flames, sometimes even at a quantitative level. However, predictions in turbulent flames still lack behind due to uncertainties in the intricate coupling between kinetics, aerosol dynamics and turbulence, and the wide range of scales that have to be …
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Oxygen-Enhanced Combustion: Theory and Applications
… dioxide mixing scenarios. For gaseous non-premixed flames, combining fuel-dilution with oxygen-enrichment can dramatically alter the flame structure: i.e. the relationship between the local temperature and local species concentrations). The extent of fuel-dilution and oxygen-enrichment …
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EXPERIMENTAL INVESTIGATION OF THE RESPONSE OF FLAMES WITH DIFFERENT DEGREES OF PREMIXEDNESS TO ACOUSTIC OSCILLATIONS
… of the response of lean turbulent swirling flames with different degrees of premixedness (i.e. different mixture patterns) to acoustic forcing using the same burner configuration and varying only the fuel injection strategy. Special emphasis was placed on the amplitude dependence of their …