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 15 of 15 for “"Optical engine"”.
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Modelling and diagnostic study of flow in an optical engine with negative valve overlapping for homogeneous charge compression ignition
The three-dimensional bulk gas motion in an engine cylinder with different flow scales generates a varied range of shear stresses and deformations in the fluid, which leads to the gas turbulence. These flow irregularities combined with periodic engine operation induce gas fluctuations over time and …
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Combustion quality and regimes for standard and alternative fuels
… require the next generation internal combustion engine (ICE) 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 …
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Spray characterization of flex-fuel gasoline di injectors and spray interaction with charge motion in a variable valve actuation engine
… behavior of in-cylinder charge motion in a GDI engine which is equipped with variable valve actuation. High speed spray visualization in a spray chamber was conducted for a study of spray development. By Schlieren visualization technique, the effect of different conditions including ambient …
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Characterization of Glow Plug and HCCI Combustion Processes in a Small Volume at High Engine Speed - Load Range, Emission Characteristics and Optical Diagnostics
… been carried out using a modified model airplane engine. The whole study can be divided into two main parts; in the first, the nature of the glow plug combustion was investigated through experiments on a metal engine and by use of optical diagnostics. Once the glow plug combustion process was …
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Photophysical characterization of toluene and 3 pentanone for quantitative imaging of fuel/air ratio and temperature in combustion systems
… fluorescence (LIF) has grown to an important engineering tool in modern engine research. However, quantitative interpretation of fluorescence signals in terms of fuel/air ratio or temperature requires sound fundamental knowledge of the compound’s photophysical behavior, i.e. the dependence of …
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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 …
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Experimental Investigation of the Blowby Effect on the Three-Piece Oil Control Ring and Subsequent Oil Transport in Transient Engine Working Conditions
… (LOC) has been a critical issue for vehicle and engine manufactures for a long time. It can generate harmful Oil Emission (OE) as well as deteriorate the aftertreatment system. During transient engine operations, an increase of OE can be introduced but some of the mechanisms remained unclear. …
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Quantification Of Auto-Ignition In Diesel Engines
… values obtained by Kook et al in (2005) on an optical engine do not agree with data obtained in an identical metallic engine by Jayakumar using fuels of same CN. </p> <p>The disparity in their results can be attributed to the differences in ignition delay (ID) and effective temperature …
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Development Of A Two-Color Optical Diagnostic For The Determination Of Engine In-Cylinder Soot Temperature And Volume Fraction Evolution With A Flame-Calibrated Emissivity Model
… to quantify this parameter in-cylinder. Optical diagnostic techniques such as -- Rayleigh scattering, filtered Raman scattering (Doppler), Raman scattering, coherent anti-stokes Raman spectroscopy (CARS), vibrational thermally-assisted fluorescence, two-line atomic fluorescence, two-line …
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Experimental Investigation And Development Of An Extended Two Color Method (etcm) With Application To Internal Combustion Engines
<p>The internal combustion engine is on a continuous path of improvement to reduce exhaust gaseous emissions and improve fuel economy. While recent trends in diesel engine development have lowered the EGR requirements, future regulatory pressure will likely result in a reversed trend in the future. …
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Combustion diagnostics in Homogeneous Charge Compression Ignition optical and thermal single cylinder engines
… a Homogeneous Charge Compression Ignition (HCCI) engine with a negative valve overlap (NVO) strategy. Conventional (pressure-transducer based) measurements and passive optical research have contributed to understanding of the chemical-physical sites of HCCI autoignition and combustion. This …
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Source modulated multiplexed hyperspectral imaging: Theory, hardware and application
… that uses a digital micromirror array as the optical engine to project light patterns onto a sample object. A single point spectrometer measures light that is reflected from the sample. Multiplexing patterns encode the spectral response from the sample, where each spectrum taken is the sum of …
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Combustion Visualization And Particulate Matter Emission Of A Gdi Engine By Using Gasoline And E85
<p>In order to increase engine efficiency as well as to reduce emission, optimizing combustion is always the challenge in research and product development. Gasoline direct injection (GDI) engines have been popularized due to its higher power density, fuel efficiency, and the possibility for …
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Understanding the development of a reacting fuel jet inside an automotive-size diesel engine using optical and laser-based diagnostics
… development have been studied in a small-bore optical engine to improve the understanding of a swirl-influenced, wall-interacting diesel flame. The optical access to the engine combustion chamber was made possible via multiple quartz windows positioned in a cylindrical piston bowl and cylinder …
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Study of Ultra-low Emissions Diesel Combustion Systems by Synergetic Application of 3D-CFD and Single-Cylinder Engine
L'abstract è presente nell'allegato / the abstract is in the attachment