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 32 for “"exhaust gas recirculation"”.
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The autoignition characteristics of turbocharged spark ignition engines with exhaust gas recirculation
… abatement approach studied entails the recirculation of burned exhaust gasses which serve to dilute the air-fuel mixture and reduce maximum unburned gas temperatures Experimental testing was performed on two different types of exhaust gas recirculation (EGR) system - one which extracts …
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Effects of split injection and exhaust gas recirculation strategies on combustion and emissions characteristics in a modern V6 diesel engine
… dwell period, pilot fuel quantity) and cooled Exhaust Gas Recirculation (EGR) on a modern V6 common rail direct injection diesel engine. In the case of using EGR (49–52%) at 1500 rpm and 10% of engine peak torque, by increasing the fuel injection pressure from 300 to 800 bar, engine thermal …
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Effects of exhaust gas recirculation on exhaust nitric oxide concentrations, cycle-to-cycle variations, and flame speed in an S.I. engine.
Thesis: M.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1973
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Computational Modeling of Nitrogen Oxide Emissions From Biodiesel Combustion Based on Accurate Fuel Properties
… angle, retarding start of injection, applying exhaust gas recirculation (EGR) and charge air cooling were all effective in reducing NOx emissions from biodiesel.
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Combustion and pollutant characteristics of IC engines fueled with hydrogen and diesel/hydrogen mixtures using 3D computations with detailed chemical kinetics
… on the engine performance and emissions, such as exhaust gas recirculation (EGR) and ignition timing were also investigated. Furthermore, the maximization of engine power and minimization of NOx emissions were considered as conflicting objectives for preliminary optimization. Finally, a skeletal …
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Development of a high efficiency dilute gasoline engine
Development of a High Efficiency Dilute Gasoline Engine (HEDGE) and control system for use in the Challenge X design competition encompasses the body of this work. The HEDGE concept embodies running an engine on gasoline at Diesel-like compression ratios. This is accomplished through extreme …
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Design, set up and commissioning of a test facility for smokeless rich diesel combustion research
… 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 soot. There is interest within the …
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Combustion optimization in a hydrogen-enhanced lean burn SI engine
… was also run to investigate the impact of high exhaust gas recirculation (EGR) dilution rates on combustion stability. Results indicate that optimizations of the combustion system in conjunction with hydrogen-enhancement can extend the lean limit of operation by roughly 25% compared against the …
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Simulations of thermophoretic deposition in wavy channels
The use of exhaust gas recirculation coolers is important for minimization of harmful NOx emissions from large diesel engines. But the use of the soot filled exhaust leads to the deposition of particles on the fins of the EGR cooler. So it is important to understand the soot deposition mechanisms …
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High load limits of the controlled autoignition engine
… heavily diluted with either excess air or burned gas. One problem that limits the engine's introduction into the market is that the rate of combustion can be fast to the point that it is very loud and is destructive to the mechanical components of the engine. The nature of this problem is akin to …
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Autoignition and flame speed of premixed liquefied petroleum gas in a rapid compression machine: experimental results and reduced chemical kinetic mechanism
Liquefied petroleum gas (LPG) has many properties that make it an attractive alternative fuel such as lower cost than conventional fuels and an established distribution infrastructure. The development of high efficiency, spark ignited LPG engines is currently limited by engine knock and misfire. …
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Mean-value modelling and robust control of the airpath of a turbocharged diesel engine.
… with variable geometry turbocharger (VGT) and exhaust gas recirculation (EGR). Both the EGR and the VGT are driven by the exhaust gas and render the control problem inherently multivariable. In order to allow for model-based control design, a mean-value model of the airpath of the engine is …
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Applicability of hybrid methods in engine control system design
… the challenges of engine management for diesel exhaust aftertreatment. Theoretical work has been supported by experiments carried out in a diesel engine test cell. A control relevant air-path model was developed using experimental work carried out on a diesel engine and dynamometer, with the aim …
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Optimizing conventional combustion and implementing low-temperature combustion of biodiesel in a common-rail high-speed direct-injection engine
… each fuel. Focus was placed on a combination of exhaust gas recirculation (EGR) ratio and start of injection (SOI) timing, as these parameters are easily modified and have significant effects on engine emissions. Tests were run at low to moderate engine load at different engine speeds. It was …
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Characterization of the exhaust gas condensate pH values of gasoline engines
Exhaust Gas Recirculation has been used in gasoline engines to reduce NOx formation and part-load throttle loss for many years. More recently, there is a trend towards down-sizing and turbocharging engines as the strategy helps to improve fuel economy. Cooled low pressure EGR complements …
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In Cylinder NOx Control Technologies for Marine Diesel Engines
… period (valve overlap) to increase the amount of exhaust gases in the combustion chamber. However, the remarkably high boost pressure levels needed for such extreme Miller cycles, require mandatorily the use of two stage turbocharging systems. Despite two stages turbocharging, combined with …
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Influences of the internal residual on combustion instabilities in the misfire and partial burn regimes of a dilute spark-ignition engine
… of dilution either from excess oxidizer or exhaust gas recirculation (EGR) causes combustion to become more strained and cycle-to-cycle variations increase. At high levels of dilution incomplete combustion events (i.e. misfires and partial burns) start to occur, which cause combustion …
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Emission Reduction and Assisted Combustion Strategies for Compression Ignition Engines with Subsequent Testing on a Single-Cylinder Engine
… manufactures involves the use of cooled EGR (exhaust gas recirculation) to reduce combustion temperatures. However, a downfall to this method is the formation of particulate matter (PM) from the reduced combustion temperatures. This reduction in NOx emissions with resulting increasing PM …
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