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Showing 1 to 12 of 12 for “"Lean combustion"”.
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Combustion lean limits fundamentals and their application to a SI hydrogen-enhanced engine concept
Operating an engine with excess air, under lean conditions, has significant benefits in terms of increased engine efficiency and reduced emissions. However, under high dilution levels, a lean limit is reached where combustion becomes unstable, significantly deteriorating drivability and engine …
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Development and Characterization of a Synchronously Actuated Response Atomizer for Studying Thermoacoustic Instabilities
… health have led to the development of greener combustion techniques for use in turbomachinery applications. Lean Direct Injection is an active area of research for how fuel is introduced and burned in the combustor section of a jet engine or land based liquid fuel turbine. Overall lean …
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A Lean-Premixed Hydrogen Injector with Vane Driven Swirl for Application in Gas Turbines
… has a wide range of flammability limits, fuel lean combustion can take place at lower equivalence ratios than those with typical hydrocarbon fuels. Numerous efforts have been made to develop gas turbine fuel injectors that premix methane/natural gas and air in fuel lean proportions prior to the …
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Sensitivity analysis and optimization in low order thermoacoustic models
Lean combustion technologies in gas turbines reduce the generation of NOx but increase the susceptibility to thermoacoustic oscillations. These oscillations can produce structural damage and need to be eliminated. The stability of a given configuration can be examined with a thermoacoustic model. …
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An Investigation of Lean Premixed Hydrogen Combustion in a Gas Turbine Engine
… about the carbon emissions associated with the combustion of conventional hydrocarbon fuels, hydrogen is gaining more attention as a clean alternative. The combustion of hydrogen in air produces no carbon emissions. However, hydrogen-air combustion does have the potential to produce oxides of …
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Experimental investigation of nitrogen oxide production in premixed reacting jets in a vitiated crossflow
… It is motivated by interest in axial staging of combustion as an approach to reduce undesirable NOx emissions from gas turbine combustors operating at high flame temperatures (>1900K). In lean-premixed combustion, NOx levels are exponential functions of temperature and linear functions of …
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Investigation of the multi-physics of laser-induced ignition of transportation fuels
<p>Cleaner and more efficient combustion systems are expected to operate at conditions where successful spark ignition is difficult to achieve. Laser ignition is a proposed alternative ignition system capable of stable engine performance under these conditions. Fundamental studies are needed to …
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Analyses of Bluff Body and Swirl-Stabilised Flames Using Large Eddy Simulation
Premixed and partially premixed lean combustion is utilised in modern gas turbine systems, since an improved efficiency and lower flame temperatures can be achieved, thereby offering reductions in pollutant emissions. The stability of these flames in practical combustion systems, where ubiquitous …
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Large eddy simulations of hydrogen/methane jets in crossflows under engine-relevant conditions
… requires careful integration into existing combustion systems, particularly through fuel-flexible strategies such as hydrogen-methane blends. Among various fuel injection strategies, the jet in crossflow (JICF) presents a promising configuration for hydrogen in gas turbine applications, …
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Autoignition and combustion chemistry of kerosene type fuels and components
The research in this thesis is focused on the combustion of conventional (petroleum-based) jet fuels, alternative (synthetic or bio-derived) fuels, and pure fuel components at low combustion temperatures (500 – 725K) and under stoichiometric to fuel lean conditions. These conditions are of interest …
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Numerical and Experimental Investigation of the CO2 Reduction Potential of a Dual-Diluted Spark-Ignition Engine Concept for Plug-In Hybrid Electric Vehicle Applications
L'abstract è presente nell'allegato / the abstract is in the attachment