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 53 for “"fuel composition"”.
-
Fuel composition and quality sensing for diesel engines
ABSTRACT The range of fuels that a diesel engine may be expected to burn is increasing including the use of biodiesels and alcohols produced from various plant or animal sources. Moreover, fuels can become unsuitable for application in diesel engines due to a variety of contamination, degradation, …
-
The use of model compounds to investigate the influence of fuel composition on the thermo-oxidative stability of fame/diesel blends
… to petroleum diesel. Small differences in fuel properties such as component concentration or total acidity can lead to the formation of deposits which can reduce engine performance and increase maintenance requirements and costs. Thermo-oxidative stressing was performed in two reactor …
-
Increasing Cermet Fuel Thermal Margin with Thoria for Nuclear Thermal Propulsion
… NTP performance were considered by improving the fuel margin to melting point. A thorium-dioxide stabilized, high-assay low enriched uranium (HALEU) tungsten-uranium dioxide (W-UO2) CERMET fueled nuclear thermal propulsion (NTP) concept was produced based on the Space Capable Cryogenic Thermal …
-
Advanced online fuel reprocessing simulation for thorium-fueled molten salt breeder reactor
… reprocessing by modeling the changing isotopic composition of an irradiated fuel salt. SaltProc couples with the Monte Carlo code, SERPENT 2, for neutron transport and depletion calculations. SaltProc capabilities include a generic geometry capable of modeling multi-region and multi-flow …
-
Towards predicting dynamics in turbulent premixed combustion using PIV-PLIF measurements of flow-flame microstructure
… development of high-efficiency, low-emission and fuel-flexible combustion systems used for propulsion and power generation. Predicting the onset of dynamics remains a challenge because of the complex interactions among several multi-scale phenomena, including turbulence, kinetics and acoustics, …
-
Solid fuel ramjet infrared signature
… the effects of equivalence ratio (Ø) and fuel composition on the infrared signature of solid fueled ramjets (SFRJ). Solid fuels investigated were Plexiglas, HTPB, and HTPB with aluminum, silicon, boron carbide, and/or magnesium. They were tested at chamber pressures of 80-170 psia and with …
-
Development of a database for alternative jet fuels
… and benefits of a database for alternative jet fuels. Data on alternative jet fuels, conventional jet fuels and blends of alternative and conventional jet fuels were collected from the Air Force Research Lab, Metron Aviation and Petroleum Quality Information System. This data was converted to a …
-
Advanced control techniques and sensors for gas engines with NSCR
… (NSCR) catalyst system requires complex fuel control strategies. The allowable equivalence ratio operating range is very narrow where NSCR systems achieve simultaneous reduction of Carbon Monoxide (CO), Nitrogen Oxides (NOx), Total Hydrocarbons (THC), Volatile Organic Compounds (VOC's), …
-
Mathematical Modeling of An Anode-Supported Micro-Tubular Sofc Powered by Ammonia
… micro-tubular SOFCs with ammonia as the fuel. This two-dimensional (2D) mathematical model consists of a set of equations that describe the conservation of heat, mass, momentum and charge, which are solved simultaneously by COMSOL MULTIPHYSICS 4.1a. We investigated the effects of the …
-
The effects of temperature distortion on aerodynamics and low engine order forced response in axial turbines
… are challenged to adapt to variations of the fuel composition driven by the need of efficient and lowCO2 power generation. Introducing syngas, a synthesis gas fuel that is used to power integrated gasification combined cycle (IGCC) power plants, is likely to affect the operating conditions of …
-
Soot formation in direct injection spark ignition engines under cold-idle operating conditions
… rapidly in popularity, largely due to the fuel efficiency improvements in the turbo-downsized engine configuration that are enabled by direct injection technology. Unfortunately, direct injection spark ignition engines also emit higher concentrations of particulate matter than conventional …
-
Synthesis gas use in internal combustion engines.
… A CI engine operating on ethanol and hydrogen fuel 2.) A CI engine operating on diesel fuel with varying blends of synthesis gas 3.) A SI engine operating on varying blends of synthesis gas <DISS_para>4.) An HCCI engine operating on hydrogen fuel 5.) An HCCI engine operating on varying blends …
-
Physics-Based 3D Multi-Directional Reloading Algorithm for Deep Burn HTR Prismatic Block Systems
… ongoing efforts on advanced closed-fuel cycle options and adapted open cycles have led to investigations of various strategies involving utilization of Transuranic (TRU) nuclides in nuclear reactors. Due to favorable performance characteristics, multiple studies are focused on …
-
The effect of hydrocarbon exposure and temperature on the behaviour of elastomeric seals
Synthetic jet fuels have been proposed as alternatives to petroleum Jet A-1. Compatibility issues, however, are of concern; specifically the interaction of synthetic fuels with polymeric materials which are commonly used to seal fuel systems. This is because of differences between the composition …
-
Fundamental studies in hydrogen-rich combustion : instability mechanisms and dynamic mode selection
Hydrogen-rich alternative fuels are likely to play a significant role in future power generation systems. The emergence of the integrated gasification combined cycle (IGCC) as one of the favored technologies for incorporating carbon capture into coal-based power plants increases the need for gas …
-
Efficient development and uncertainty propagation of aviation fuel chemical kinetic models
… of reduced chemical kinetic mechanisms for jet fuels, with a focus on sustainable aviation fuels (SAFs). The framework is designed to balance model accuracy, computational efficiency, and experimental requirements for quick development times and application in complex environments like …
-
Physics-based flame dynamics modeling and thermoacoustic instability mitigation
… the equivalence ratio, inlet temperature and the fuel composition, the combustor operates under different dynamic modes. The operating conditions at the transition between different modes were predicted by developing a model based on the acoustic and vortex time scales. A passive control strategy …
-
The characterization of the flowfield of a dump combustor
… analyzer. Operational parameters such as fuel composition, fuel injection location, acoustic configuration, and equivalence ratio were varied until instabilities were minimized. The optimal configuration ran with upstream fuel injection (premixed mode) at the duct center line and an …
-
Effect of market fuel variation and cetane improvers on CAI combustion in a GDI engine
There is continued interest in improving the fuel conversion efficiency of internal combustion engines and simultaneously reducing their emissions. One promising technology is that of Controlled Auto Ignition (CAI) combustion. The lack of direct combustion control makes control of CAI combustion …
-
Sensitivity of economic performance of the nuclear fuel cycle to simulation modeling assumptions
Comparing different nuclear fuel cycles and assessing their implications require a fuel cycle simulation model as complete and realistic as possible. In this thesis, methodological implications of modeling choices are discussed in connection with development of the MIT fuel cycle simulation code …
Page 1 of 3