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 29 for “"combustion modeling"”.
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Simplified Combustion Modeling of Composite Propellants
… is developed to study the characteristics of the combustion process. The solid composite is a periodic sandwich unit comprised of two oxidizer laminates separated by a fuel binder layer. Included in the model are essential features for simulating composite propellant combustion: (1) a free surface …
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Scramjet combustion modeling using eddy dissipation model
… the Eddy Dissipation Model (EDM) to describe the combustion process inside an open-access Computational Fluid Dynamics (CFD) solver. Typical CFD modeling approaches for turbulent supersonic reacting flows are associated with a high computational cost. This in turn inhibits the use of CFD in …
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Gasification and combustion modeling for porous char particles
Gasification and combustion of porous char particles occurs in many industrial applications. Reactor-scale outputs of importance depend critically on processes that occur at the particle-scale. Because char particles often possess a wide range of pore sizes and react under varying operating …
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Large eddy simulations of premixed turbulent flame dynamics : combustion modeling, validation and analysis
… preferred as they achieve efficient and clean combustion. A drawback of lean premixed combustion, however, is that the flames are more prone to dynamics. The unsteady release of sensible heat and flow dilatation in combustion processes create pressure fluctuations which, particularly in …
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HYDRODYNAMIC CHARACTERISTICS AND COAL COMBUSTION MODELING OF A HIGH VELOCITY FLUIDIZED BED (SOLIDS FRICTION FACTOR, TWO PHASE FLOW, PRESSURE PROFILE, FAST)
… contact and can play an important role in coal combustion. It can be operated under pressure making it eminently suited for the production of high temperature gas from coal for operating gas turbines for power generation. The LFB can operate over a wide range of gas flow rates and coal can be …
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Edge-Flames in Premixed Combustion
… in the context of premixed turbulent combustion modeling in the laminar flamelet regime.
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Hybrid Eulerian/Lagrangian 3D methods for high Reynolds number reactive flows
Research in advanced combustion modeling is critical to developing control strategies for optimized propulsion systems, especially with regard to stability, emissions, and power density. Examining combustion dynamics and control using numerical simulations, however, presents several challenges, …
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Energy methods for reaction-diffusion problems
… arise in many areas of applied sciences such as combustion modeling, population dynamics, chemical kinetics, etc. A fundamental problem in the studies of these equations is to understand the long time behavior of solutions of the associated Cauchy problem. These kinds of questions were originally …
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Modeling Three Reacting Flow Systems with Modern Computational Fluid Dynamics
Computational fluid dynamics (CFD) modeling and analysis were used in three projects: solar CO2 conversion modeling, improved coal combustion modeling using STAR-CD, and premixed combustion modeling. Each project is described below. The solar CO2 conversion modeling project involved CFD simulations …
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Numerical simulation of combustion and unburnt products in dual-fuel compression-ignition engines with multiple injection
… natural gas can enable promising approaches to combustion engine design. In particular, the combination of low reactivity natural gas and high reactivity diesel may allow for optimal operation as a reactivity-controlled compression ignition (RCCI) engine, which has potential for high efficiency …
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Methodology For Validating Multi-Dimensional Engine Combustion Models And Fuel Surrogates Using An Optically Accessible Compression Ignition Engine
… regulation, three dimensional in-cylinder combustion modeling is increasingly being used as a tool to optimize the combustion process and reduce the cost of experimental testing. Due to the complexity of the physical and chemical interactions involved in the in-cylinder combustion process, …
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Spectroscopic measurements and modeling of carbonaceous particle combustion in a shock tube
Carbonaceous nanoparticle (CNP) combustion shapes optical signatures and heat release in detonation-relevant multiphase flows, yet quantitative constraints on particle temperature, sublimation rates, reaction kinetics, and wavelength-dependent optical properties remain limited under short-duration, …
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Development of air/fuel ratio control and secondary combustion for a commercial-scale biomass-fueled boiler
The development, testing, and modeling of a multi-fuel biomass combustion system is described. The system is developed by adding air/fuel ratio control and catalytic secondary combustion to a commercially available 150 kW biomass-fueled boiler. The basis of the air/fuel ratio control system is an …
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LARGE EDDY SIMULATION OF TURBULENT HYDROGEN FLAMES
… dissertation investigates turbulent hydrogen combustion using large eddy simulation (LES) combined with advanced combustion modeling approaches. In particular, flamelet-based models and transported probability density function (PDF) methods based on the Eulerian stochastic fields (ESF) …
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Model Order Reduction: Application to Electromagnetic Problems
… increase in computational resources, numerical modeling has grown expo- nentially these last two decades. From structural analysis to combustion modeling and electromagnetics, discretization methods–in particular the finite element method–have had a tremendous impact. Their main advantage …
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Numerical Modeling of a Ducted Rocket Combustor With Experimental Validation
… a high-fidelity numerical model of a unique combustion flow problem combining multi-phase fuel injection with substantial momentum and temperature into a highly complex turbulent flow. This important problem is very different from typical and more widely known liquid fuel combustion problems …
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Linear Stability Analysis of a Rijke Tube and Modeling of Turbulent Combustion Using Dynamic Well-Stirred Reactors
… model qualitative behavior observed in turbulent combustion. First a model of dynamic well-stirred reactor is derived, and then several reactors are coupled together by recirculation. The dynamics of the various models are computed and assessed. The models exhibit interesting behavior that has …
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Inverse problems in thermoacoustics
… writes about the role of CFD in thermoacoustic modeling: The main reason that CFD has otherwise been relatively helpless in this subject is that problems of combustion instabilities involve physical and chemical matters that are still not well understood. Moreover, they exist in practical …
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Reaction mechanisms of hydrocarbon and mercury systems in the atmosphere and in combustion: A theoretical study of thermochemical and kinetic properties
… efficiency and optimize the current available combustion processes and fuel sources, to develop alternative fuels and to reduce the emissions of toxic pollutants. The objective of this dissertation is to present thermochemical, kinetic and modeling results on two reference fuels (the land …
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