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 14 of 14 for “"Ignition model"”.
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Calibration and implementation of a functional global auto-ignition model
… on a functional global reaction-rate-based auto-ignition model (FGAM) developed at the Sasol Advanced Fuels Laboratory (SAFL). During the development of the model, its performance had been validated against a detailed kinetic auto-ignition mechanism in regions of lean to stoichiometric air-fuel …
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Characterization of aluminum powder ignition
Heating rate effect and particle size effect on ignition temperature of Al powder were studied to collect data for development of a possible Al powder ignition model. Aluminum ignition is associated with a highly accelerated burn rate and high combustion enthalpy. A new ignition model, which can …
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Two contrasting approaches to auto-ignition modelling for HCCI engines
… broad contrasting of two hydrocarbon fuel auto-ignition models formulated for the emulation of combustion dynamics in Homogeneous Charge Compression Ignition (HCCI) engines. The first (empirical) auto-ignition model was adapted from its previously published form, for HCCI engine model …
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Effect of polymorphic phase transformations within an alumina layer on the ignition of aluminum particles
Experimental measurements of aluminum ignition temperature and models used to describe aluminum ignition are reviewed. It is shown that the current models cannot describe ignition of aluminum powders of different sizes and ignited under various experimental conditions. The properties of and phase …
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Combustion and soot formation modelling in modern gasoline direct injection engines using computational fluid dynamics
… the use of 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 …
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The effect of random and spatially explicit lightning and human-caused ignitions on simulated burn probabilities at small scales
… burn probability (BP) generated from simulation models using random ignitions versus spatially explicit ignitions for wildland urban interface (WUI) areas and designated wilderness in the Rocky Mountain West, and infer whether one may be more useful than the other at small scales. We collected …
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The effect of random and spatially explicit lightning and human-caused ignitions on simulated burn probabilities at small scales
… burn probability (BP) generated from simulation models using random ignitions versus spatially explicit ignitions for wildland urban interface (WUI) areas and designated wilderness in the Rocky Mountain West, and infer whether one may be more useful than the other at small scales. We collected …
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Knock behavior of a lean-burn hydrogen-enhanced engine concept
… substantiate these. results, a chemical kinetic ignition model was used to predict autoigntion of the end-gas for various conditions and fuel-air mixtures. Predicted model trends of knock onset partially agree with experimental observations. A comprehensive isooctane chemistry mechanism was used …
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Ignition and propagation mechanisms of spray flames
… and intensify the stochastic behaviour of ignition. Still, the presence of small droplets has been found to decrease minimum ignition energies and enhance flame speeds. In this study, a comprehensive analysis of the phases of ignition in sprays is carried out in a controlled, …
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Ignition mechanism in nanocomposites thermites
… several recent efforts aimed at understanding ignition mechanisms of nanocomposite reactive materials. Although significant progress has been made, ignition mechanisms remain elusive. At the same time, a robust ignition model is required to incorporate these materials in practical energetic …
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Study of the heating and ignition of metal powder by electrostatic discharge
… the processes that lead to ESD stimulated ignition events in metal powders. Several metals were studied: Mg, Al, and Ti. A commercially available ESD test device was adapted for the present experiments. The ESD current and voltage were measured using inductance coils; the data were used to …
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Advancing Coupled Fire-Atmosphere Simulation: Fuel Representation and Fire Spotting
… the fire simulation capabilities by developing models and parametrization to introduce key missing physics in the current platforms. First, the performance of WRF-Fire is evaluated in simulating historic fires including the 2018 Camp Fire. Simulation results are compared with high …
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Experimental and Theoretical Study of Hypergolic Solid Fuel Ignition and Combustion with Hydrogen Peroxide
Hypergolic ignition provides significant advantages for hybrid rockets by eliminating the need for conventional ignition devices, enabling rapid and reliable startup. This study investigates the ignition and combustion behaviors of hypergolic solid fuels (HSFs) using rocket-grade hydrogen peroxide …
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Auto-Ignition of Liquid n-Paraffin Fuels Mixtures as Single Droplets Using Continuous Thermodynamics
This thesis reports a model to predict the auto-ignition time of single droplets of n-paraffin fuel mixtures using the method of continuous thermodynamics. The model uses experimental data for pure fuels to fit rate parameters for a single-step global chemical reaction equation; from this, …