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 19 of 19 for “"Pollutant emission"”.
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experimental investigation of a reacting transverse jet in a high pressure oscillating vitiated crossflow
… approach in a gas turbine engine to reduce pollutant emission levels. In axially staged combustion, portions of the air and fuel are injected downstream of a lean premixed low NOx primary combustion zone. The gas residence time at elevated temperatures is decreased resulting in lower thermal …
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Configuration and Operating Condition Design Analysis of SOFC Systems for Building Applications
… assessment of the system such as the air pollutant emission performance, the lifecycle assessment (LCA) of SOFC systems from manufacturing stage through the abolition stage and the faster execution time for the further elaboration of the optimization process and the incorporation of the …
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Reducing emissions of a large bore two stroke cycle engine using a natural gas and hydrogen mixture
… Protection Agency (EPA) continues to tighten pollutant emission regulations throughout the United States. As a result, the need to reduce air pollutants such as nitrogen oxides (NO[subscript]x) and carbon monoxide (CO) remains a challenge for pipeline operators. NO[subscript]x formation is …
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Regional Coordination in Electricity Supply and Investment Financing
… requirements; current and potential locations; pollutant emission rates and emission controls for existing and potential power generation activities; seasonal electricity loads; and economic and demographic variables. The models determine the optimal sizes, types, locations, and pollution …
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Simulation of Combustion and Thermal-flow Inside a Pyroscrubber
… of unburned volatiles, solid carbon, ashes, or emissions (e.g. CO, NOx and SOx) in the flue gas finally discharged. To maximize the energy recovery and reduce pollutant emission from the pyroscrubber, 3-D computational models are developed using FLUENT to simulate the combustion and thermal-flow …
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Air Pollution Distribution under an Elevated Train Station (A Case Study of Silom Station in Downtown Bangkok)
… area covers Silom road and obstructs the air pollutant dispersion in a congestion area. The 1: 200 physical model of the buildings along Silom road with the train station, S2, was simulated in this research to determine the air pollutant dispersion in the train station area. A tracer gas (CO₂) …
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NO<sub>x</sub> reduction for natural gas engines with increased ignition energy and plasma jet ignitors
… 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. The energy for the ignitors …
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Feasibility studies of the exhaust-gas reforming of hydrocarbon and alcohol fuels
… of predicted engine thermal efficiency and pollutant emission levels for reformed and conventional fuelling strategies. Conclusions of the theoretical studies were sufficiently encouraging to warrant a practical investigation, and hence the design, construction and commissioning of a …
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Experimental and computational investigation of combustion phenomena in mesoscale ducts
… flames were found to have fuel leakage and pollutant emission no greater than conventional stationary flames, and to produce a nearly uniform temperature in the tube wall, aspects that make them highly suitable for small-scale power generation. The results of the experiments were used in …
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Modelling of turbulent stratified flames
Due to concerns about pollutant emission combustion systems are increasingly being designed to operate in a lean premixed mode. However, the reduction in emissions offered by lean premixed combustion can be offset by its susceptibility to instabilities and ignition and extinction problems. These …
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Evaluación de impactos ambientales en la industria porcina y propuestas de mejora en el manejo de purines. Estudio de caso
… it generates, identifying the main sources of pollutant emission and where they are dispersed. Proposals will be developed that allow the improvement of waste management in this farm, in addition to proposing different ways of valuing the slurry that is generated.The results indicate that the …
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Computational Fluid Dynamics Investigation of Oscillatory Behaviour in Annular Combustors
… on combustion chambers to minimise harmful pollutant emission. Measures employed to counter this issue may result in oscillatory behaviour, which can cause substantial damage to the engine. Recent work has been undertaken on predicting this behaviour in annular combustors. The complexity of …
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Behaviour of accelerating entropy spots
… within the aerospace community. Stricter pollutant emission regulations have forced the introduction of lean premixed pre-vaporised combustors, which produce less NOx but burn more unsteadily, generating more noise and creating the potential for combustion instabilities. Pressure …
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Development and testing of a methodology for attributing sources of airborne pollutants to their receptors
Identification of airborne pollutant sources and estimation of source contributions to air quality ‘hot spots’ are very important in ambient air quality management. Social, economical, political and legal constraints on air quality management demand a convenient and accurate method for attributing …
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Turbulent partially premixed combustion: DNS analysis and RANS simulation
Increasingly stringent regulation of pollutant emission has motivated the search for cleaner and more efficient combustion devices, which remain the primary means of power generation and propulsion for all kinds of transport. Fuel-lean premixed combustion technology has been identified to be a …
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Experimental Investigation on Different After-treatment Technologies for the Control of Pollutant Emissions from Automotive Diesel Engines.
… efficiency (lower fuel consumption and CO2 emissions), drivability, durability and reliability. Increasing concerns regarding the two main pollutants from Diesel engines, NOx and PM, started a progressive process of tightening of emission limits; Tier 2 (USA) and Euro5b/6 (Europe) emissions …
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Experimental study of neat Hydrotreated Vegetable Oil (HVO) as an alternative fuel in light duty internal combustion engines
L'abstract è presente nell'allegato / the abstract is in the attachment
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Applications of Deep Learning, Machine Learning, and Remote Sensing to Improving Air Quality and Solar Energy Production
… requires high spatial homogeneity in the pollutant concentrations to be fully effective. We further demonstrated that our algorithm performance is insensitive to training window size as the mean prediction error rate and the standard error of the mean (SEM) for the 22 reference stations …
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Simulations of turbulent swirl combustors
… extinctions and re-ignition, as well as the pollutants emissions. The third study presents a comprehensive analysis of the aerodynamics of swirl flows based on the TECFLAM confined non-premixed S09c configuration. A periodic component inside the air inlet pipe and around the central bluff …