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 38 for “"Specific fuel consumption"”.
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Modeling brake specific fuel consumption to support exploration of doubly fed electric machines in naval engineering applications
… as operated in comparison to its potential. The fuel consumption of prime movers is a multi-variable function of power demand and rotational speed. Mechanically coupled power and propulsion arrangements constrain this two degree of freedom relationship by removing the independence of the speed …
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Computer control of engine-transmission system for improving fuel economy
… the engine works along a line of minimum brake specific fuel consumption (BSFC).
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Propulsion system concepts for silent aircraft
… ratios result in a significant decrease in specific fuel consumption. However, the cost for a step change in jet noise reduction is a dramatic drop in specific thrust which requires larger engine diameters, and hence yields penalties in weight and installation drag. For a given noise goal, …
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Avaliação de ésteres etílicos como aditivo à gasolina
… additives based on characterization analyzes, consumption in Otto cycle engine and the effect of additives on fuel lubricity. Characterization analyzes were made according to ASTM and ABNT standards. The lubricity tests were carried out using a HFRR (High Frequency Reciprocating Test Rig) …
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Combustion characteristics of synthetic gasoline in modern charge boosted GDI Engines
… to process economics to formulate commercial fuel blends that meet in-house fit-for-purpose requirements and the legislated fuel specifications in South Africa. In this study the potential for optimisation of a fuel blend using full boiling range synthetic blending components to enhance its …
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Engine instrumentation and data analysis for ignition system testing
The charge ignition system is used to ignite the fuel-air mixture in the combustion chamber of a spark ignited internal combustion engine and is the subject of many ongoing research projects. As a means to quantify the performance of an ignition system, a 16 horsepower Briggs and Stratton V-twin …
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Constant Velocity Combustion Scramjet Analysis
… the ideal scramjet using the engine parameters: specific thrust, fuel-to-air ratio, thrust specific fuel consumption, thermal efficiency, propulsive efficiency, overall efficiency and thrust flux. The objective of the work is to determine the desirable performance terms of the ideal scramjet, by …
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Propulsion considerations for supersonic oblique flying wings
… cycle analysis. Lift-to-drag ratio, thrust specific fuel consumption, and nacelle wave drag were examined as intermediate figures of merit that would ultimately impact the final performance metric-namely, range parameter and specific excess power. It was found that higher bypass ratio …
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Performance study on the effect of different exhaust length for motorcycle engine
… has been attached to the dynamometer. The engine specifications and measured components of exhaust system were used for modelling and visualization using GT-Power simulation software. The different length of exhaust will be used for the simulation. Brake power, brake mean effective pressure (BMEP) …
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Design, set up and commissioning of a test facility for smokeless rich diesel combustion research
… and those of soot. There is interest within the fuels research community in investigating the effects of diesel fuel formulations on LTC, using a suitable engine test platform. The objective of this study was to design and set up a test apparatus capable of achieving LTC in a diesel research …
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Investigation of Passive Flow Modulation for Full-Scale Air-Oil Coolers for Turbofan Engine Applications
… a need has been created to improve the thrust specific fuel consumption and improve the fuel efficiency of the engines used for these aircraft. To further improve the efficiency of the turbofan engine research has been focused on the cooling and lubricating system. The thrust specific fuel …
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Parametric Scramjet Analysis
… vehicle will depend on existing materials and fuels; this work presents the performance of the ideal scramjet engine for three different combustion chamber materials and three different candidate fuels. Engine performance is explored by parametric cycle analysis for the ideal scramjet as a …
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Development of aircraft fuel burn modeling techniques with applications to global emissions modeling and assessment of the benefits of reduced vertical separation minimums
… the ability to adequately model and quantify fuel burn and emissions on a system wide scale is of high importance. In particular, the ability to adequately assess the ability of operational alternatives within the commercial aviation system to improve system efficiency and reduce environmental …
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Investigation on the Performance Characteristics of Two Valveless Pulse Jets Operating in Phase Opposition
… The total thrust per engine and the total-thrust specific fuel consumption for the coupled engines were inferior to the respective values for Engebretson’s single engine. However, indications are that coupled engines have a potential for improvement through further research. In the thesis, six …
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Análise dos parâmetros de desempenho de um motor de ignição por centelha operando com gasolina ou etanol com adição de hidrogênio
… of the application of hydrogen as complementary fuel to gasoline and ethanol in a spark ignition engine, verifying the modifications of the engine performance parameters. In the research a numerical study was carried out, adopting a quasi-dimensional model for a combustion, simulating the engine …
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Toward CFD-based correlations for a single-stage high-pressure transonic turbine
… useful to determine the efficiency and thus the Specific Fuel Consumption (SFC of the engine, before even having blade geometries. Also, correlations play a very. important role in the understanding of the behavior (performance) of the engine, under different operating conditions. Since most …
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NO<sub>x</sub> reduction for natural gas engines with increased ignition energy and plasma jet ignitors
… were tested on a Waukesha ASTM-CFR engine fueled with natural gas. The pollutant emissions, fuel and air flow rates and dynamic cylinder pressure were measured for the full range of Air/Fuel ratios. From these measurements the indicated power and specific fuel consumption were calculated. …
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Computational Investigation of Ethanol and Bifuel Feasibility in Solstice Engine
… Injection (GDI) engine enables an increased fuel efficiency and higher power output than a conventional Port Fuel Injection (PFI) system. By injecting pressurized fuel straight into each cylinder of an internal-combustion engine, the degree of fuel atomization is increased, as well as the …
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Performance limits of axial turbomachine stages
… and pressure ratios are selected for minimum fuel consumption, even small increases in component efficiency can lead to substantial increases in overall engine efficiency. For example, if the efficiency of components is increased from 90% to 95% and the design is optimized, the specific fuel …
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Analysis and optimization of fuel cell based integrated powering systems for clean rail applications
In this thesis, proposals of novel integrated fuel cell powering systems for cleaner railway applications are presented and analyzed thermodynamically. Both energy and exergy analyses are conducted on these systems for such an application to evaluate and compare them thermodynamically, in terms of …
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