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Showing 1 to 11 of 11 for “"soot precursors"”.
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The Effect of Ozone on Diesel Soot Precursors
… Tech to study the effect of ozone on diesel soot precursors. This thesis is the first stage of the numerical part of the project, and contains a study of the effect of the different ozone levels on diesel soot precursors. This numerical study is executed via the use of two computer programs, …
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Combustion and soot formation modelling in modern gasoline direct injection engines using computational fluid dynamics
… 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 processes, …
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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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CFD Simulation of Combustion Using Automatically Reduced Reaction Mechanisms : A Case for Diesel Engine
… cells for chemistry calculations. NOx and soot, which are considered as the main pollutants in a Diesel engine are predicted using a Zeldovich model and a phenomenological two-equation model respectively, with the NO and soot precursors obtained from the ILDM chemistry. Low-temperature …
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Mathematical modeling of solid oxide fuel cells using hydrocarbon fuels
… have been identified: homogeneously formed soot and catalytically grown carbon fiber. All previous thermodynamic analyses have used graphite to represent the properties of the deposited carbon regardless of the formation mechanism. However, the energetic and entropic properties of these two …
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Oxygen-Enhanced Combustion: Theory and Applications
… been identified as the primary cause for reduced soot formation in high <italic>Z</italic><sub>st</sub> flames. Local temperature-species relationships resulting in soot-free conditions have been shown to correlate with a single conserved scalar, the local atomic carbon-to-oxygen ratio: C/O). A …
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Particulate matter formation in spark-ignition engines
… fuel in the cylinder, and the availability of soot precursors. PM emissions vary by up to six orders of magnitude between the fuels tested, when at the same fuel/air equivalence ratio. Minimum PM concentrations are emitted at a global fuel/air ratio within 10% of stoichiometric, with the exact …
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Multiscale simulation of methane assisted fluidized bed biomass gasification
… accelerate the conversion of lighter PAH's into soot precursors at a fixed operating temperature. Experimental data and modeling results agree that the char reacts with very significant fraction of air/oxygen, improving its overall conversion drastically and reducing the steady state bed …
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Predicting Soot Emissions with Advanced Turbulent Reacting Flow Modelling
Soot is carbonaceous particulate matter formed due to the incomplete combustion of hydrocarbon fuels. The prediction of soot emissions is crucial if next-generation combustion devices are to mitigate the deleterious effects of particulate matter on human health and the environment. Theories for the …
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Studies in Advanced Oxy-combustion Technologies
… and (2) numerical studies of flame structure and soot inception, interpreted in the carbon-to-oxygen atom ratio space for laminar diffusion flames.</p> <p>Part I. Oxy-fuel combustion is considered a promising technology for carbon capture, utilization, and storage (CCUS). One of the primary …
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Small-Scale Batch-Fed Biomass Gasification and Combustion
… over tars, which may be toxic if released, and soot precursors if combusted. Thus, an intrinsic decomposition of tars may be beneficial. The product distribution can be influenced by specific mechanisms; for example tars can decompose to form gases at high temperatures and this conversion may be …