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.
Results
Showing 1 to 20 of 27 for “"compression ignition engine"”.
-
Numerical Analysis of Biodiesel Combustion in a Direct Injection Compression Ignition Engine
… 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 engine model was validated against pressure and temperature …
-
Extension of the high load limit in the Homogeneous Charge Compression Ignition engine
The Homogeneous Charge Compression Ignition (HCCI) engine offers diesel-like efficiency with very low soot and NOx emissions. In a HCCI engine, a premixed charge of air, fuel and burned gas is compressed to achieve autoigntion. Combustion occurs throughout the chamber volume resulting in short …
-
Performance and emissions of compression ignition engine fueled with preheated blend of vegetable oil
… fuel has been a problem that can been use in a compression ignition engine. Straight vegetable oil is one of the most reliable fuel that suitable for diesel engine. The scope of study of this study is focused on performance and emission of the straight vegetable oil from the grocery store to …
-
Effect of ambient conditions and fuel properties on homogeneous charge compression ignition engine operation
Practical application of Homogeneous Charge Compression Ignition (HCCI) combustion must demonstrate robust responses to variations in environmental conditions. This work examines the impact of ambient conditions and fuel changes on HCCI engine operation, and evaluates cam phasing as a mechanism to …
-
Methodology For Validating Multi-Dimensional Engine Combustion Models And Fuel Surrogates Using An Optically Accessible Compression Ignition Engine
<p>In response to increasingly stringent engine emissions regulation, three dimensional in-cylinder combustion modeling is increasingly being used as a tool to optimize the combustion process and reduce the cost of experimental testing. Due to the complexity of the physical and chemical …
-
Research on the Performance of JP-8, Single Fuel Concept, in Diesel Engine Application for Airport Ground Support Equipment
… compatibility of this fuel with existing diesel engine systems arise. It is for this reason, this research investigates the combustion, emissions, and performance characteristics of JP-8 and Ultra Low Sulfur Diesel (ULSD) fuels in airport ground support equipment engine (GSE) similar to the …
-
Computational and Experimental Investigations on Biodiesel Combustion Process
… which was also observed experimentally using a Compression Ignition Engine (CIE). Having said so, the experimental work also showed that surrogate fuels perform far better than pure diesel and biodiesel in CIE) in terms of emissions. The experimental work further addressed some phyisical and …
-
Modeling of droplet evaporation, flash-boiling, and mixture preparation in internal combustion engines
The evolving regulation on internal combustion engine emissions as well as the rising expectation on the engine efficiency and performance pose challenges in the development of the future engine technology. Computational methods are needed to understand the mechanism of the advanced engine …
-
Synthesis gas use in internal combustion engines.
… investigate the combustion characteristics of a compression ignition, spark ignition, and homogeneous charge compression ignition engine operating on various blends of synthesis gas. To fully investigate the three ICE operating regimes, experimental investigations were carried out to focus on: …
-
Combustion and pollutant characteristics of IC engines fueled with hydrogen and diesel/hydrogen mixtures using 3D computations with detailed chemical kinetics
… for optimum 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 …
-
Syngas production using a catalytic engine
… way. The processes use internal combustion engines as a chemical reformer to convert natural gas to syngas by means of fuel-rich, incomplete combustion. This thesis project parallels a project that uses homogeneous reforming in-cylinder without a catalyst, with air or oxygen-enriched air …
-
Multi-criteria lifecycle evaluation of transportation fuels derived from biomass gasification
… production routes. In this thesis both Spark Ignition Engine fuels (Methanol, Ethanol, Mixed Alcohols, and Methanol-to-Gasoline Synthetic Gasoline) and Compression Ignition Engine fuels (Dimethyl Ether and Fischer-Tröpsch Diesel). The abovementioned fuels are analyzed on a lifecycle basis with …
-
Effect of engine operating parameters and fuel characteristics on diesel engine emissions
… Fischer-Tropsch (FT) diesel fuel in a modern compression ignition engine, experiments were conducted on a MY 2002 Cummins 5.9 L diesel engine outfitted with high pressure, common rail fuel injection, a variable geometry turbo charger, cooled EGR and a fully configurable engine management …
-
Performance and emission characteristics of a gas-diesel engine
… investigated in a single-cylinder, two-stroke compression-ignition engine with a poppet-valve gas-diesel injector. The investigated injector geometries and engine operating parameters included: fuel injection angle, fuel jet interruption ratio, engine speed, load, beginning of injection timing, …
-
Design, setup of an optically accessible internal combustion engine for study of gasoline direct injection combustion
Gasoline direct injection (GDI) engines are becoming attractive options for automobiles. The precise control over fuel delivery increases the potential for better fuel efficiency and higher performance. In this study, a single-cylinder optically-accessible engine was built to visualize GDI …
-
One-dimensional simulation of a retrofitted medium duty engine running using compressed natural gas
… fuel. A potential alternative fuel for compression ignition (C.I.) engine is the compressed natural gas (CNG). For C.I. engines to operate using CNG, or to be converted as a retrofitted CNG engine, further modifications are required. Previous works reported loss in brake power (BP) and …
-
Effect of start injection toward combustion, performances and emision characteristic of B20 biodiesel fuel
… in biodiesel fuel as alternative fuel for diesel engine has been implemented in Malaysia. However, the utilization of biodiesel is problematic because the low output power is due to incomplete combustion and incorrect vaporization characteristic. In this research, a small compression ignition …
-
Novel Ignition Approaches for Improved Hydrogen Ignition
The first study examined H₂ double injection ignition with varying dwell times. Experiments utilized a constant-volume combustion chamber (CVCC) with optical access, replicating compression-ignition engine conditions. Baseline environment: 23.8kg/m³ gas density, 21vol.% O₂, 1000K core temperature. …
-
The effects of operating conditions on the hydrodynamic lubricant film thickness at the piston-ring / cylinder liner interface of a firing diesel engine
… of piston-rings in internal combustion engines are performed at relatively low speeds and consider only steady state operation conditions. Loss of power in internal combustion (IC) engines is becoming an increasing issue when they are operated at high engine speeds. This project is …
-
Optimizing conventional combustion and implementing low-temperature combustion of biodiesel in a common-rail high-speed direct-injection engine
… biodiesel-diesel blends were run in a production compression ignition engine to determine optimized engine control module (ECM) settings for 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 …
Page 1 of 2