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 39 for “"Blowout"”.
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Study of Lean Blowout Limits and Effects of Near Blowout Oscillations on Flow Field and Heat Transfer on Gas Turbine Combustor
… However, LPM combustors are susceptible to lean blowout (LBO), and other corresponding instabilities as the combustor is operated lean. Therefore, it is essential to understand the LBO limits and dynamics of flow in lean operating conditions. One of the other primary parameters for the improved …
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Real-Time Prediction of Lean Blowout using Chemical Reactor Network
… measurements in real time with regard to blowout proximity. The free radical concentrations and their trends and ratios are studied in each reactor zone. The results indicate that the hydroxyl radical maximum concentration moves downstream as the reactor approaches LBO. The ratio of …
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Effects of Leading-Edge Flame Behavior on Flame Stabilization and Blowout
… fluctuations are also observed in flames where blowout is imminent. The height and rate of these fluctuations are studied with respect to average height, flow velocities, and Reynolds number. Additionally, the mechanisms that cause jet-flame blowout, particularly in the presence of air co-flow, …
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Stochastic modelling for the analysis of blowout risk in exploration drilling.
… describes a stochastic model for the analysis of blowout risk in NCS exploratory drilling. The totality of the blowout risk modelling has been secured through examinations of probability models and their influence on risk interpretation and overall analysis objectives; analyses of current physical …
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Intrusion dynamics of small oil droplets from a deep ocean blowout
This paper presents an experimental study of the behavior of oil plumes in ambient stratification and a mild current, in which the flow is classified as stratification-dominated. Experiments are conducted in an inverted framework by releasing a continuous stream of dense glass beads from a carriage …
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Assemblage Comparisons of Living Benthic Foraminifera at Bathyal Sites Oiled and Un-Oiled by the Deepwater Horizon Blowout in the Northeastern Gulf of Mexico
<p>Live benthic foraminiferal assemblages were studied at contaminated and uncontaminated bathyal sites around the wellhead of the Deepwater Horizon oil spill. Samples collected in October of 2010 and 2011 and summer of 2012 were divided into uncontaminated (GIP 12, 21, K, and 25 and Obs0), …
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Kinematic synthesis of a well service machine
Blowout preventers are used in the oil well industry to prevent accidental oil fires, and guide valves are assembled atop the preventers. The current solution is to use cranes, as this is time-consuming and expensive, a solution using an appropriate four-bar mechanism for this purpose was …
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Numerical analysis of a shear ram and experimental determination of fracture parameters
… the offshore drilling industry relies on the Blowout Preventer (BOP) as the primary means of controlling a 'well kick' or 'blowout'. One of the most important components of the BOP are the shear rams which are tasked with cutting the drilling string in case of an emergency, allowing the blind …
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The influence of fuel properties on threshold combustion in aviation gas turbine engines
… operating conditions. It focused on altitude blowout performance and was in part motivated by results that were encountered during an aviation industry evaluation of synthetic kerosene that complied with the Jet A-1 specification, but differed from the fuel that was used as a reference in …
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NON-DIMENSIONAL DATA-DRIVEN MODELS OF COMPUTATIONAL FLUID DYNAMICS (CFD) OF MULTI-PHASE FLOW IN ANNULUS
… drilling process of an oil and gas well, the blowout preventer (BOP) serves as a critical safety device to monitor and control wells to prevent blowouts. However, it is usually subject to the high-temperature and high-pressure (HTHP) conditions. These extreme working conditions challenge the …
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LARGE-EDDY SIMULATION OF DEEP-WATER HYDROCARBON PLUME DYNAMICS
During a deep-water wellhead blowout incident, the dynamics of the released hydrocarbon plume is strongly affected by the gas dissolution and hydration process that weakens the bubble-induced buoyancy for driving the plume. In this study, a new modeling strategy is developed to efficiently …
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The Hampering Active Wellbore Kit (HAWK) for rapidly controlling a free flowing oil well
To mitigate the impact of a Blowout Preventer (BOP) failure, this work proposes a method and machine that can create a gradual flow reduction to zero in an offshore well by introducing a mechanical plug inside the BOP. The backup safety tool, referred to as the Hampering Active Wellbore Kit (HAWK), …
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Métodos de verificação de integridade de poços marítimos em campos maduros durante seu ciclo produtivo
… É notável que diversos acidentes envolvendo blowout em plataformas marítimas são causados por questões de má gestão de integridade de poço, portanto, no presente trabalho é apresentada uma revisão bibliográfica nos conceitos de integridade poço e, consequentemente, as normas que devem ser …
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Development of potholes from cracks in flexible pavements
… and formation of potholes. A special case of blowout of asphalt pavement layer lying on an impermeable concrete base, due to water pressure in the cracks, is studied and a mathematical model is proposed. The mathematical formulations are applied to typical III pavement models and the results …
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An Experimental Investigation of Ejector Ramjet Performance at Static Conditions
… was investigated as a tool for predicting engine blowout and provided improved resolution of the engine’s combustion limits, which could be applied to the 1D-ERAM solver
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Modelling the two-phase plume dynamics of CO2 leakage into open shallow waters
… pH changes. The most serious leak is from a well blowout, with maximum pH changes of up to -2.7 and changes greater than -0.1 affecting areas up to 0.23 km2. Other scenarios through geological structures would be challenging to detect with pH changes below -0.27.
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Influence of Petroleum Deposit Geometry on Local Gradient of Electron Acceptors and Microbial Catabolic Potential
… was conducted following the Deepwater Horizon blowout and it was noted that resulting coastal petroleum deposits possessed distinct geometries, ranging from small tar balls to expansive horizontal oil sheets. A laboratory study evaluated the effect of oil deposit geometry on localized gradients …
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The Relationship between Superstitious Behaviors of Sports Fans, Team Identification, Team Location, and Game Outcome
… high vs. low) x 2 (game outcome: close game vs. blowout) x 2 (location of team: local vs. distant) between subjects factorial design. Participants for the current study included 234 students, recruited from undergraduate psychology classes at Western Kentucky University. Participants completed …
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Investigation of a prototype industrial gas turbine combustor using alternative gaseous fuels
… ratio could be optimized to lower the lean blowout limit. Increasing the RPL equivalence ratio was shown to extend the lean blowout limit, up to a limit after which the RPL flame was quenched. Reactor network modelling showed that the stabilizing effect of the RPL was a combination of …
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