Browsing Theses--ERC by Title
Now showing items 23-42 of 44
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Near-wall PLIF Imaging of Formaldehyde in an HCCI Engine
(2009-07-08)This project studied the characteristics of Homogeneous-Charge Compression Ignition (HCCI) combustion near the combustion chamber surfaces using Planar Laser- Induced Fluorescence (PLIF) of the intermediate combustion ... -
NOISE-FREE INCORPORATION OF MULTIMODE FIBERS INTO ABSORPTION SPECTROSCOPY EXPERIMENTS
(2009-06-24)This project develops and evaluates alternative methods to the traditional way of detecting light transmitted through optical fibers in spectroscopy experiments. The main motivation behind this work is to develop an ... -
Non-Intrusive Engine Piston Temperature Measurement Using a Fiber Bragg Grating
(2009-07-08)An embedded fiber Bragg grating was used to examine the operating temperature of a small gasoline engine piston. Optical system analyses were conducted to enhance the accuracy and consistency of the measured piston ... -
Numerical and Experimental Fuel Flow Analysis of Small Engine Carburetor Idle Circuits
(2009-07-08)Small engine carburetors have been used for over 100 years and their continual development has produced a mechanical device that although simple in principle is difficult to control in practice. This study aims to develop ... -
OH Absorption Spectroscopy to Investigate Light-Load HCCI Combustion
(2009-07-08)Absorption spectroscopy of the OH molecule was used to examine the light-load limit of the HCCI combustion process. Optical results were compared to cylinder pressure and emissions data, with a focus on the transition ... -
OPTICAL INVESTIGATIONS OF THE EFFECTS OF STRATIFICATION ON HOMOGENEOUS CHARGE COMPRESSION IGNITION COMBUSTION
(2009-07-08)The effects that thermal and compositional stratification have on homogeneous charge compression ignition (HCCI) combustion were studied using an optically accessible internal combustion engine. A stratified flowfield ... -
Optical Spray Patternation of Gasoline Fuel Injectors
(2009-07-08)Planar Mie scattering images were acquired for 21 injectors to investigate the feasibility of a predictive method of injector performance in an engine. A testing apparatus was constructed, which allowed optical access ... -
Particulate Matter Formation Mechanisms in a Direct-Injection Gasoline Engine
(2009-07-08)Experiments were conducted to determine the particulate formation mechanisms of a single-cylinder direct-injection two-stroke gasoline engine. The engine was tested at four operating points; an idle condition with a ... -
PISTON HEAT TRANSFER IN AN AIR-COOLED ENGINE
(2009-07-08)Thermal energy flow within the piston of an air cooled engine was investigated by measuring the heat flux in the engine cylinder liner in the region of travel of the piston rings. Engine sump oil temperature and oil ... -
QUANTITATIVE 2-D FUEL VAPOR CONCENTRATION MEASUREMENTS IN AN EVAPORATING DIESEL SPRAY USING THE EXCIPLEX FLUORESCENCE METHOD
(2009-07-08)To experimentally investigate evaporating sprays under conditions experienced in high speed direct-injection (HSDI) diesel engines, the exciplex (excited state complex) laser-induced fluorescence technique and high-speed ... -
RESIDUAL GAS EFFECTS ON COMBUSTION IN AN AIR-COOLED UTILITY ENGINE
(2009-07-08)Air-cooled utility engines are often equipped with cams designed to ensure maximum charging efficiency, but the resulting valve lift and timing often correlates to poor engine performance at low speeds and light loads, ... -
Residual Gas Mixing in Engines
(2009-07-08)The mixing of fresh charge with residual gases was studied in a spark-ignition engine using planar laser-induced fluorescence (PLIF) of a homogenous air/fuel/tracer mixture. An adjustable, dual-overhead cam cylinder head ... -
SCAVENGING MEASUREMENTS IN A DIRECT-INJECTION TWO-STROKE ENGINE
(2009-07-08)The scavenging process in a direct-injection two-stroke research engine was examined. A physical model was developed to characterize scavenging based on known quantities. An electromagnetic valve was used to sample ... -
Spectroscopic Investigation of Chemiluminescence in Gasoline Homogeneous Charge Compression Ignition Engine
(2009-07-08)A spectroscopic diagnostic system has been designed to study the effects of different engine parameters on the chemiluminescence characteristic of HCCI combustion. Light emitted during the combustion process was collected ... -
Spray Mixing in Engines
(2009-07-08)The mixing of a fuel spray in an optically accessible direct-injection spark-ignition engine was investigated to yield both comparative conclusions between different engine characteristics and fundamental observations of ... -
Strategies for Optical Measurements in Rocket Plumes
(2009-06-19)An ideal rocket engine sensing system might probe several key elements of the rocket engine including: the fuel and oxidizer supply for mass flow rate and impurities, the combustion chamber for pressure and mole fraction ... -
Transient High-Pressure Hydrogen Jet Measurements
(2009-07-08)Jets produced by prototype multi-hole gaseous injectors were visualized using schlieren methods. Hydrogen and helium were injected at pressures ranging from 1.3 bar to 104 bar into chamber densities ranging from 1.15 to ... -
UNBURNED HYDROCARBON EMISSION MECHANISMS IN SMALL ENGINES
(2009-07-08)The effect of the liquid fuel in the intake manifold, the ring pack crevices and the oil film on the unburned hydrocarbon (HC) emissions of a spark-ignited, carbureted, air-cooled V-twin engine was studied. Tests were ... -
Water Vapor Absorption Thermometry for Practical Combustion Applications
(2009-06-24)Thermometry in combustion applications by means of laser absorption spectroscopy is a well established diagnostic. The experimental simplicity and wealth of knowledge that can be readily gained from an absorption spectrum ... -
WAVELENGTH-AGILE ABSORPTION SPECTROSCOPY FOR MEASURING TEMPERATURE AND H2O MOLE FRACTION IN HARSH ENVIRONMENTS
(2009-06-24)This project develops the necessary tools and methods to measure H2O absorption spectra in harsh environments, and calculate temperature and mole fraction from the measured spectra. Various wavelength-agile sources are ...