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 11 of 11 for “"fuel control"”.
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Minimum Time/Minimum Fuel Control of an Axisymmetric Rigid Body
… during flight in a minimum time or minimum fuel fashion. This thesis will present a minimum time/fuel control solution to reorienting an axisymmetric rigid body using eigenaxis maneuvers. Any fixed desired attitude can be achieved by rotating the rigid body about its eigenaxis. While an …
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Digital Fuel Control for a Lean Premixed Hydrogen-Fueled Gas Turbine Engine
… turbines are suitable for operation on hydrogen fuel. This thesis reports the results of investigations of the special requirements of the fuel controller for a hydrogen gas turbine. In this investigation, a digital fuel controller for a hydrogen-fueled modified Pratt and Whitney PT6A-20 …
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FAULT DIAGNOSIS OF ELECTRONIC FUEL CONTROL (EFC) VALVES VIA DYNAMIC PERFORMANCE TEST METHOD
Electronic Fuel Control (EFC) valve regulates fuel flow to the injector fuel supply line in the Cummins Pressure Time (PT) fuel system. The EFC system controls the fuel flow by means of a variable orifice that is electrically actuated. The supplier of the EFC valves inspects all parts before they …
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The effect of sulphur in fuel on the performance of automotive catalysts
… were used that operated under very lean air/fuel conditions and gave rise to increased sulphate particulate emissions. These sulphate emissions could fortunately be reduced by better air/fuel control. However, the introduction of more active catalyst compositions, in particular the use of …
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A MEMS valve for the MIT Microengine
… fabricated and tested. The valve will be a fuel control component in a micro-scale gas turbine engine. Room-temperature testing results using nitrogen have demonstrated repeatable valve functions and choked flow characteristics. MIT has initiated a project to build a micro-scale gas turbine …
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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), …
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Virtual sensor for air mass flow measurement in an SI engine: Application of distributed lumped modelling in prediction of air mass flow into the cylinder of SI combustion engines
… needed during engine development so the fuel control can be accurately calibrated and as a result increase performance and reduce emission output of an engine. The current methods used to determine the air mass flow lead to inaccuracies due to the large amount of mathematical assumptions …
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An Exploration of Secondary Fuel Injection as Actuation for Control of Combustion Instabilities in a Laminar Premixed Tube Combustor
Active control of combustion instabilities through secondary fuel injection is a control method that has gained a lot of attention in the past decade. Previous control schemes with acoustic loudspeakers are not practical in full-scale gas turbines due to the extreme temperatures and acoustic power …
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Application of Multi-Port Mixing for Passive Suppression of Thermo-Acoustic Instabilities in Premixed Combustors
… without compromising efficiency. Mixing the fuel and air prior to combustion allows for lower temperature flame zones, creating the potential for drastically reduced nitrous oxide emissions. While effective, these systems are commonly plagued by combustion driven instabilities. These …
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Effects of pretreatment tree dominance and conifer removal treatments on plant succession in sagebrush communities
In sagebrush (Artemisia tridentata Nutt.) communities, the expansion and infilling of conifers decreases perennial vegetation cover and density, and lowers ecosystem resilience and resistance of the shrub-grass dominated state. Successional trajectories following disturbance are highly dependent …