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 40 for “"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
… 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 efficiency …
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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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High rate and ageing studies for the drift tubes of the Atlas Muon Spectrometer
… Atlas muon chamber and a prototype of the gas recirculation system planned at LHC were used for the first time. <br>Test beam muons were utilized to evaluate the MDT high rate behaviour; questions of resolution, efficiency and changes in the drift properties of the operating gas were …
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Computational Modeling of Nitrogen Oxide Emissions From Biodiesel Combustion Based on Accurate Fuel Properties
… 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
… 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 reaction …
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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
… 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 fuels …
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Capture and recovery of organic gases with electrothermal swing adsorption and post-desorption treatment
… packaging manufacturing, use liquefied organic gases (boiling points (Tb) < 20°C) as inert feedstocks. These processes produce low concentration (e.g., 2,000 ppmv) organic gas streams that must be treated to prevent emissions of the organic gases to the atmosphere. The organic gases are …
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Techno-economic analysis of pressurized oxy-fuel combustion power cycle for CO₂ capture
Growing concerns over greenhouse gas emissions have driven extensive research into new power generation cycles that enable carbon dioxide capture and sequestration. In this regard, oxy-fuel combustion is a promising new technology for capturing carbon dioxide in power generation systems utilizing …
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Combustion optimization in a hydrogen-enhanced lean burn SI engine
… 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 baseline …
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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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Comparison of Dairy Manure Anaerobic Digestion Performance in Gas-lift and Bubble Column Digesters
… mechnical stirring, liquid circulation, and gas circulation, among which the gas circulation proves to be the most effcient way. In this work, we studied the liquid flow pattern of two differetn type of gas-circualtion based anaerobic digesters, with the aim to understand the effects of …
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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.
… 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 derived …
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Applicability of hybrid methods in engine control system design
… throttle and a valve associated with the exhaust gas recirculation system to control the in-cylinder quantities of fresh air and exhaust gas. Model predictive control techniques were used to design a hybrid controller, which was compared to a traditional proportional and integral controller and a …
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Optimizing conventional combustion and implementing low-temperature combustion of biodiesel in a common-rail high-speed direct-injection engine
… 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 found that …
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