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 28 for “"Dual-fuel"”.
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Dual fuel conversion of a direct-injection diesel engine
Dual fuel pilot-injected diesel natural gas engines offer significant potential to reduce oxides of nitrogen (NOx) and particulate matter (PK emissions while maintaining diesel-like efficiency. A 1994 Navistar T444E turbocharger V-8 diesel engine was converted to dual fuel diesel and compressed …
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Development of a Phenomenological Combustion Model for Large Bore Dual Fuel Engines
L'abstract è presente nell'allegato / the abstract is in the attachment
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CFD investigation on hydrogen enrichment effect to dual-fuel direct injection diesel engine
… of previous studies on the use of alternative fuels; hydrogen-natural gas blends (HCNG) used port injection and experimentally were conducted. The use of Computational Fluid Dynamics (CFD) simulations in analyzing the effect of adding (0 - 90) % hydrogen to blend fuel and varying the …
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Knock phenomenon analysis on a diesel-CNG dual fuel engine using experimental fuel ratio
… is crucial to establish a proper Diesel-CNG Dual Fuel (DDF) engine. The causes of this phenomenon are still vague due to the lack of knock detection and characterization methods available. This study presents a knock characterization technique using a statistical analysis based on engine …
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Diesel-cng dual fuel combustion characterization using vibro-acoustic analysis and response surface methodology
… process from any diesel vehicle to a diesel-CNG dual fuel system requires additional fuel management. The need for an engine monitoring is vital to ensure the dual fuel operation run smoothly without excessive knocking, which may shorten the life of the engine. Knock and air-fuel ratio (AFR) …
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Optical investigation of ethanol and n-heptane dual-fuel partially premixed combution in s reciprocating engine
<p>The details of the dual-fuel combustion of n-heptane and ethanol were investigated in an optically accessible engine representative of light-duty applications. Experimental work involved the application of optical diagnostics such as high-speed imaging of combustion chemiluminescence and soot …
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CFD modelling and investigation of two-stroke dual-fuel marine engines with high pressure gas admission
… suffer from the high pollutants emissions, the dual fuel versions burning natural gas and pilot fuel to initiate combustion is an alternative, which can considerably reduce the engine environmental footprint. The application of the high pressure and direct injection of the natural gas can …
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Numerical simulation of combustion and unburnt products in dual-fuel compression-ignition engines with multiple injection
… in pollutant emissions. Based on current fuel price projections, operating costs would be lower. With a high ignition temperature and relatively low reactivity, natural gas can enable promising approaches to combustion engine design. In particular, the combination of low reactivity natural …
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Pathways for Low Emissions Utilizing Spray Targeted Reactivity Stratification (STARS) in High Efficiency Natural Gas Dual Fuel Combustion
… dissertation focuses on experimental analysis of dual-fuel low temperature combustion (LTC), which can be used as a strategy to reduce engine-out emissions and increase engine efficiencies. Dual fuel LTC uses two different fuels, a high reactivity fuel (HRF) and a low reactivity fuel (LRF). The …
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Design and development of a custom dual fuel (hydrogen and gasoline) power system for an extended range electric vehicle architecture
… and diesel are the most widely used automotive fuels and are refined from crude oil which is a nonrenewable resource. When they are combusted in an Internal Combustion Engine (ICE) they release significant amounts of air pollutants and Green House Gasses (GHG’s), such as NOx, CO2, SOx, CO, and …
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Combustion quality and regimes for standard and alternative fuels
… to yield lower pollutant emissions and higher fuel efficiency. Various alternative fuels and combustion strategies and regimes have shown great potential in meeting these goals. The work done in this dissertation aims at exploring different alternative fuels and advanced combustion strategies …
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Investigating the performance and emission characteristics of diesel-LPG engine operation
… are reconsidering the century-long idea of dual fuel engines. While there have been successful attempts to develop viable, sustainable alternatives to power diesel engines, the extent to which engine performance and emissions may be affected remains unknown. Therefore, this study evaluates …
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A comparison of integrated biomass to electricity systems
… steam cycle; atmospheric gasification to produce fuel gas for a dual fuel diesel engine; pressurised gasification to produce fuel gas for a gas turbine combined cycle; and fast pyrolysis to produce pyrolysis liquid for a dual fuel diesel engine. The feedstock in all cases is wood in chipped form. …
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More effective use of fuel octane in a turbocharged gasoline engine : combustion, knock, vehicle impacts
… are well known strategies for improving vehicle fuel economy. However, such strategies result in higher in-cylinder pressures and temperatures which increase the likelihood of engine knock above that of naturally-aspirated engines. A high octane fuel, such as E85, effectively suppresses knock but …
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Combustion and emission characteristics of ammonia blended fuels in a spark-ignited engine
Climate change and fossil fuel depletion has brought attention to the need for alternative fuels. Ammonia shows great potential as an alternative fuel because it is carbon-free and can be produced renewably. In this study the combustion and emission characteristics of ammonia blended fuels are …
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Combustion and soot formation modelling in modern gasoline direct injection engines using computational fluid dynamics
… representing combustion processes, liquid fuel films on cylinder surfaces, and surrogate fuel formulations within CFD frameworks. A novel evaluation and calibration approach is developed for the spray-wall interaction “Bai-Onera” model, based on published experimental results, which …
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Fundamental studies of flame propagation in lean-burn natural gas engines
… of ignition can be improved by employing a dual-fuel ignition strategy in which a small quantity of diesel fuel is injected to initiate ignition. Computational studies of n-heptane/methane-air mixing layers are performed to provide insight into the fundamental physics of dual-fuel ignition. …
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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
… operations of internal combustion engines fueled with alternative fuels, a comprehensive understanding combustion behavior and the pollutant formation inside the cylinder are needed. The first part of this thesis aimed to numerically study the engine performance and in-cylinder pollutant …
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Closed-Loop Control of HCCI Engine Dynamics
… Actuation system using the inlet valve or a dual-fuel system, results are presented. Combustion phasing is a limiting factor of the load control and emission control performance. A system where control of HCCI on a cycle-to-cycle basis is outlined and cylinder individual cycle-to-cycle …
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Potential market for LNG-fueled marine vessels in the United States
… and gas engines, hybrid diesel-gas systems, and dual fuel diesel electric engines are examples of the existing engine system technology that can burn natural gas as a fuel and lessen ship emissions. Liquefied Natural Gas (LNG) fueled vessels in the gas burning mode result in the elimination of …
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