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 30 for “"Combustion chemistry"”.
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Autoignition and combustion chemistry of kerosene type fuels and components
The research in this thesis is focused on the combustion of conventional (petroleum-based) jet fuels, alternative (synthetic or bio-derived) fuels, and pure fuel components at low combustion temperatures (500 – 725K) and under stoichiometric to fuel lean conditions. These conditions are of interest …
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A Fuel Surrogate Approach to Model Combustion Chemistry in Specialty Jet Fuels
… species and the chemically controlled combustion propensity as reflected by the cetane number of each fuel was examined. The oxidation and pyrolysis speciation data were first modeled using a surrogate-based mechanism from the CRECK Modelling Group and chemical-functional group based …
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Molecules to engines : combustion chemistry of alcohols and their application to advanced engines
… models succeed to accurately predict primary combustion products and high temperature ignition delay, two areas require further scientific understanding: peroxy chemistry and polycyclic aromatic hydrocarbon (PAH) formation. The first section of this thesis describes significant contributions …
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Predicting combustion properties of hydrocarbon fuel mixtures
In this thesis, I applied computational quantum chemistry to improve the accuracy of kinetic mechanisms that are used to model combustion chemistry. I performed transition state theory calculations for several reactions that are critical in combustion, including a detailed analysis of the pressure …
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A tale of two small oxygenated molecules as told by photoelectron photoion coincidence spectroscopy
… of their and their fragments' relevance to combustion chemistry. The Imaging PEPICO (iPEPICO) experiment at the VUV beamline of the Swiss Light Source (SLS) was utilized to provide dissociative ionization data of the two molecules of interest. In this experiment, the unimolecular …
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Illuminating reaction pathways in low-temperature combustion, pyrolysis & atmospheric oxidation
… in the atmosphere, obtaining more efficient combustion engines, and finding a way to store transient renewable energy all rely on accurate chemical mechanisms. This thesis spans this space by refining basic reaction rate theories, combining information and techniques from various fields to …
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Fourier-transformed infrared absorption spectroscopy and kinetics studies of Gas phase small molecules
… are very important in the atmospheric or combustion chemistry. We studied four types of reactions. The first one is the reactions of CSe2, SCSe and OCSe with O(3P) atom. The rate coefficients have been determined and reaction mechanism have been discussed. The second reaction is the …
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Driver-gas Tailoring For Test-time Extension Using Unconventional Driver Mixtures
To study combustion chemistry at low temperatures in a shock tube, it is of great importance to increase experimental test times, and this can be done by tailoring the interface between the driver and driven gases. Using unconventional driver-gas tailoring with the assistance of tailoring curves, …
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Studio e sviluppo di un motore a 2 tempi diesel veloce di nuova concezione per applicazioni automobilistiche
… (called HSD2), featuring a specifically designed combustion system, aimed to reduce weight, size and manufacturing costs, and improving pollutant emissions at partial load. The present work is focused on the analysis of the combustion and the scavenging process, investigated by means of a version …
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Plasma Assisted Ignition in a Three-dimensional Scramjet Combustor with a Photon-preserving Radiation Model
… discharges (NRPD) can affect and improve the combustion characteristics in a high-speed fluid flow that simulates scramjet conditions. This is done by creating a computational code that incorporates the effects of plasmas, high-speed fluid dynamics, combustion chemistry, and photoionization. …
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Acceleration of combustion computation fluid dynamics simulations through machine learning
This work demonstrated the acceleration of combustion computational fluid dynamics simulations through Deep Operator Networks (DeepONets), achieving up to an 18 times speedup in the chemical source term evaluation. Another numerical experiment showed an overall reduction of approximately 30% in …
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Investigations of Thermochemistry and the Kinetics of H Atom Radical Reactions
The thermochemistry of several species, and the kinetics of various H atom radical reactions relevant to atmospheric and combustion chemistry were investigated using ab initio theoretical techniques and the flash photolysis / resonance fluorescence technique. Using ab initio quantum mechanical …
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Multi-Physics Engine Simulation Framework for Drive Cycle Emissions Prediction. Development and Validation of a Framework for Transient Drive Cycle NOx Prediction Modelling based on Combining 1-D and 0-D Internal Combustion Engine Simulation and Statistical Meta-Modelling
… (GT- Suite 1-D air path model) and in-cylinder combustion model (CMCL Stochastic Reactor Model (SRM) Engine Suite). A set of steady state and drive cycle physical measurements obtained from physical engine testing on a dynamometer was available for the calibration and validation of the …
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Characterization and Chemical Kinetic Analysis of the Ignition of Representative Conventional and Bio-Derived Fuels
… to fundamental characterization of their combustion properties.</p> <p>Reactivity trends in furan combustion are established through ignition delay measurements of selected furans; 2,5-dimethyl furan (DMF), 2-methyl furan (2-MF), and furan. The isomer effect on the ignition of alkylated …
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A spectroscopic investigation of the thermal decomposition of cellulose and alginic acid
The combustion and pyrolysis of biomass impacts directly on a number of areas such as, energy production, public health, environmental protection and feedstock for chemical production. This study investigated the thermal decomposition of two structurally similar polysaccharides – cellulose and …
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Hybrid Dynamic Modelling of Engine Emissions on Multi-Physics Simulation Platform. A Framework Combining Dynamic and Statistical Modelling to Develop Surrogate Models of System of Internal Combustion Engine for Emission Modelling
… (GT- Suite ® 1-D air path model) and in-cylinder combustion model (CMCL ® Stochastic Reactor Model Engine Suite). In the context of the considered Engine Simulation Framework, GT Suite + Stochastic Reactor Model (SRM), one fundamental problem is to establish a real time stochastic simulation …
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Hybrid Dynamic Modelling of Engine Emissions on Multi-Physics Simulation Platform. A Framework Combining Dynamic and Statistical Modelling to Develop Surrogate Models of System of Internal Combustion Engine for Emission Modelling
… (GT- Suite ® 1-D air path model) and in-cylinder combustion model (CMCL ® Stochastic Reactor Model Engine Suite). In the context of the considered Engine Simulation Framework, GT Suite + Stochastic Reactor Model (SRM), one fundamental problem is to establish a real time stochastic simulation …
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Combustion Kinetics of Advanced Biofuels
… potential to lower greenhouse gas emissions from combustion. Ketones are a class of biofuel candidates which are produced from cellulose. However, ketones received rather scarce attention from the combustion community compared to other classes such as, alcohols, esters, and ethers. There is little …
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The nuclear spin dependence of the reaction of H3+ with H2 and the proposed spectroscopic investigation of HO2+
… intermediates in organic reactions, reactants in combustion chemistry, species in biological processes such as respiration, as interstellar species, and as species found in terrestrial and extraterrestrial atmospheres. Although extensive research has been devoted to study these species and their …
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Automatic Generation of Chemical Kinetic Models for Biofuel Oxidation and Pyrolysis
… boosting engine performance. Modeling biofuel combustion and pyrolysis chemistry with chemical kinetic models allows for high-throughput evaluation of their performance under various conditions. These models, typically comprising hundreds of species and thousands of elementary reactions, …
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