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 “"Low temperature combustion"”.
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Turbo Charged Low Temperature Combustion - Experiments, Modeling and Control
… technology involves the use of internal combustion engines in one way or another. Because of the large numbers of internal combustion engines in use around the world, their emissions have a significant environmental impact. Therefore, considerable efforts have been invested into …
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The effects of natural convection on low temperature combustion
… exothermic reaction in a closed vessel, spatial temperature gradients can develop. If these gradients become sufficiently large, the resulting buoyancy forces will move the gas, i.e. there is natural convection. The nature of the resulting flow is determined by the Rayleigh number, Ra = (β g ΔT …
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Physical Modeling and Control of Low Temperature Combustion in Engines
… of this thesis is model-based control of two combustion engine concepts, Homogeneous Charge Compression Ignition (HCCI) and Partially Premixed Combustion (PPC), using physics-based models. The studied combustion concepts hold promise of reducing the emission levels and fuel consumption of …
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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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Investigation of Emission Characteristics during Low Temperature Combustion using Multivariate Adaptive Regression Splines
… emissions from diesel engines operating in a low temperature combustion (LTC) regime are significantly affected by fuel composition and injection strategy. The starting point of this study is a collection of data correlating injection system parameters, and fuel characteristics, to response …
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Low-Temperature Combustion in a Small-Bore High-Speed Direct Injection Optically Accessible Diesel Engine
… observed for bio-diesel fuel blends showing a lower soot formation rate. The flame luminosity decreased faster for bio-diesel fuel indicating a faster soot oxidation rate. The increased NOx emissions of bio-diesel fuels were greatly reduced by employing the low temperature combustion mode. …
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Low Temperature Combustion and Emissions of Diesel with Additions of N-Butanol in a Direct Injection Compression Engine
… heavy-duty diesel research engine operating at low-speed and, low load is presented in this study. The research is focused on producing a partially premixed combustion by means of an original injection strategy. This strategy is based on introducing an early injection of n-butanol in the intake …
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The Investigation of the Low Temperature Combustion of Mesitylene and Tert-Amyl Methyl Ether by Synchrotron Photoionization Mass Spectrometry
<p>This thesis describes the combustion experiments performed at the Chemical Dynamics Beamline of the Advanced Light Source (ALS) located at the Lawrence Berkeley National Laboratories (LBNL). The need for renewable fuel sources, the need for the study of their combustion in the contexts of …
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Optimizing conventional combustion and implementing low-temperature combustion of biodiesel in a common-rail high-speed direct-injection engine
… effects on engine emissions. Tests were run at low to moderate engine load at different engine speeds. It was found that with the ECM’s default settings, higher blends of biodiesel tended to result in higher NOx emissions and lower soot emissions, in line with previous studies. It was also found …
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Controlling fuel and diluent gas flow for a diesel engine operating in the fuel rich low-temperature-combustion mode
The flow of a diluent gas supplied to a motoring engine was controlled at a diluent to air mass flow ratios of 10%, 30%, 50%, and 70%. This arrangement was a significant set up for running the engine in the Low-Temperature Combustion mode. The engine used was a 436 cc Yanmar Diesel engine, driven …
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Study of low-temperature-combustion diesel engines as an on-board reformer for intermediate temperature Solid Oxide Fuel Cell vehicles
… for Solid Oxide Fuel Cell (SOFC), a primary Low-Temperature-Combustion (LTC) technology diesel engine using will bum fuel-rich mixture to provide the high temperature combustion products necessary for SOFC. This study models the ignition properties of the fuel-rich mixture, and then applies …
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Investigation of Absolute Photoionization Cross Sections of Cyclic Ketones, Low Temperature Combustion of Propargylamine by Synchrotron Photoionization Mass Spectrometry, and Computational Study of Hypersalts
<p>The presented research was carried out at the University of San Francisco. Measurements of absolute photoionization cross sections of both cyclopentanone and cyclohexanone, as well as the Cl-initiated oxidation of propargylamine were completed through the use of a multiplexed photoionization …
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Characterization of spray and combustion of diesel-alcohol blends in a constant volume chamber
In this study, the spray combustion characteristics of Acetone-Butanol-Ethanol (ABE)/ Diesel blends was investigated. An optical-accessible constant volume chamber capable of controlling ambient temperature, pressure and oxygen concentration was used to mimic the environmental conditions inside a …
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Numerical Analysis of Biodiesel Combustion in a Direct Injection Compression Ignition Engine
<p>In this work, simulations of the combustion reaction within an optical Sandia/Cummins N14 direct-injection compression ignition engine are conducted. First, validation of the spray model against liquid and vapor penetration data was conducted using a trial and error method. Secondly, the overall …
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Design, set up and commissioning of a test facility for smokeless rich diesel combustion research
Low Temperature Combustion (LTC) is a strategy that harnesses the properties of exhaust gas, through the use of large quantities of exhaust gas recirculation (EGR), to reduce the peak combustion temperatures below that favoured by the formation processes of oxides of nitrogen (Ox) and those of …
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CO and Hydrocarbon Oxidation on PD/Ceria-Zirconia/Alumina Three-Way Catalysts
The optimization of combustion engine aftertreatment systems is critical in reducing the negative health and environmental impact of automotive emissions. Over the years, three-way catalysts (TWCs) have been developed and widely implemented to control and reduce tailpipe emissions of carbon …
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Pathways for Low Emissions Utilizing Spray Targeted Reactivity Stratification (STARS) in High Efficiency Natural Gas Dual Fuel Combustion
Internal combustion engines are a key aspect of society, and their continued use poses challenges from an environmental standpoint since they emit pollutant and greenhouse gas emissions. This dissertation focuses on experimental analysis of dual-fuel low temperature combustion (LTC), which can be …
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