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Articles 1  9 of 9
FullText Articles in Mechanical Engineering
Computational ThermalHydraulics Modeling Of Twisted Tape Enabled High Heat Flux Components, Emily Buckman Clark
Computational ThermalHydraulics Modeling Of Twisted Tape Enabled High Heat Flux Components, Emily Buckman Clark
Doctoral Dissertations
The goal of this work was to perform a computational investigation into the thermalhydraulic performance of watercooled, twisted tape enabled high heat flux components at fusion relevant conditions. Fusion energy is a promising option for future clean energy generation, but the community must overcome significant scientific and engineering challenges before meeting the goal of electricity generation. One such challenge is the high heat flux thermal management of components in fusion and plasma physics experiments. Plasma facing components in the magnetic confinement devices, such as ITER or W7X, will be subjected to extreme heat loads on the order of 1020 MW ...
Improving Predictive Capabilities Of Classical Cascade Theory For Nonproliferation Analysis, David Allen Vermillion
Improving Predictive Capabilities Of Classical Cascade Theory For Nonproliferation Analysis, David Allen Vermillion
Doctoral Dissertations
Uranium enrichment finds a direct and indispensable function in both peaceful and nonpeaceful nuclear applications. Today, over 99% of enriched uranium is produced by gas centrifuge technology. With the international dissemination of the Zippe archetypal design in 1960 followed by the widespread illicit centrifuge trafficking efforts of the A.Q. Khan network, traditional barriers to enrichment technologies are no longer as effective as they once were. Consequently, gas centrifuge technology is now regarded as a highpriority nuclear proliferation threat, and the international nonproliferation community seeks new avenues to effectively and efficiently respond to this emergent threat.
Effective response first requires ...
Lattice Boltzmann Methods For Wind Energy Analysis, Stephen Lloyd Wood
Lattice Boltzmann Methods For Wind Energy Analysis, Stephen Lloyd Wood
Doctoral Dissertations
An estimate of the United States wind potential conducted in 2011 found that the energy available at an altitude of 80 meters is approximately triple the wind energy available 50 meters above ground. In 2012, 43% of all new electricity generation installed in the U.S. (13.1 GW) came from wind power. The majority of this power, 79%, comes from large utility scale turbines that are being manufactured at unprecedented sizes. Existing wind plants operate with a capacity factor of only approximately 30%. Measurements have shown that the turbulent wake of a turbine persists for many rotor diameters, inducing ...
Measurements Of Methyl Radicals And Temperatures By Using Coherent Microwave Rayleigh Scattering From Resonance Enhanced Multiphoton Ionization, Yue Wu
Doctoral Dissertations
This thesis includes two main parts: (I) The CH_{3}[methyl radical] detection in methane/air flames and (II) the rotational temperature measurement of O_{2}[molecular oxygen] in a variety of environments by using coherent microwave Rayleigh scattering from resonance enhanced multiphoton ionization (Radar REMPI).
In first the part, from Chapter I to Chapter III, the methyl radical detection and quantitative measurements have been conducted in hydrocarbon flame with onedimensional and twodimensional spatialresolved concentration distribution. Due to the proximity of the argon resonance state (4+1 REMPI by 332.5 nm) with the CH_{3} state (2+1 REMPI ...
Essentially Analytical Theory Closure For Space Filtered ThermalIncompressible NavierStokes Partial Differential Equation System On Bounded Domains, Mikhail Alexandrovich Sekachev
Essentially Analytical Theory Closure For Space Filtered ThermalIncompressible NavierStokes Partial Differential Equation System On Bounded Domains, Mikhail Alexandrovich Sekachev
Doctoral Dissertations
Numerical simulation of turbulent flows is identified as one of the grand challenges in highperformance computing. The straight forward approach of solving the NavierStokes (NS) equations is termed Direct Numerical Simulation (DNS). In DNS the majority of computational effort is spent on resolving the smallest scales of turbulence, which makes this approach impractical for most industrial applications even on presentday supercomputers. A more feasible approach termed Large Eddy Simulation (LES) has evolved over the last five decades to facilitate turbulent flow predictions for reasonable Reynolds (Re) numbers and domain sizes. LES theory uses the concept of convolution with a spatial ...
Fully Coupled Fluid And Electrodynamic Modeling Of Plasmas: A TwoFluid Isomorphism And A Strong Conservative FluxCoupled Finite Volume Framework, Richard Joel Thompson
Fully Coupled Fluid And Electrodynamic Modeling Of Plasmas: A TwoFluid Isomorphism And A Strong Conservative FluxCoupled Finite Volume Framework, Richard Joel Thompson
Doctoral Dissertations
Ideal and resistive magnetohydrodynamics (MHD) have long served as the incumbent framework for modeling plasmas of engineering interest. However, new applications, such as hypersonic flight and propulsion, plasma propulsion, plasma instability in engineering devices, charge separation effects and electromagnetic wave interaction effects may demand a higherfidelity physical model. For these cases, the twofluid plasma model or its limiting case of a single bulk fluid, which results in a singlefluid coupled system of the NavierStokes and Maxwell equations, is necessary and permits a deeper physical study than the MHD framework. At present, major challenges are imposed on solving these physical models ...
Multidimensional Compressible Framework For Modeling Biglobal Stability In Rocket Motors, Michel Henry Akiki
Multidimensional Compressible Framework For Modeling Biglobal Stability In Rocket Motors, Michel Henry Akiki
Doctoral Dissertations
Rocket motor stability analysis has historically been focused on two fundamental theories: the acoustic and the hydrodynamic. While the acoustic part examines the system at resonant states, the hydrodynamic component focuses on the fluidwall interactions and the vortex shedding mechanisms which are responsible for exciting the system. Traditionally, the two concepts are studied independently and their results are then superposed for a more complete solution. In this study, we analyze the problem from a hydrodynamic standpoint and extend it to include compressibility. This is realized by reducing the linearized NavierStokes and energy equations to their biglobal form assuming a twodimensional ...
The Biglobal Instability Of The Bidirectional Vortex, Joshua Will Batterson
The Biglobal Instability Of The Bidirectional Vortex, Joshua Will Batterson
Doctoral Dissertations
State of the art research in hydrodynamic stability analysis has moved from classic onedimensional methods such as the local nonparallel approach and the parabolized stability equations to twodimensional, biglobal, methods. The paradigm shift toward two dimensional techniques with the ability to accommodate fully threedimensional base flows is a necessary step toward modeling complex, multidimensional flowfields in modern propulsive applications. Here, we employ a twodimensional spatial waveform with sinusoidal temporal dependence to reduce the threedimensional linearized NavierStokes equations to their biglobal form. Addressing hydrodynamic stability in this way circumvents the restrictive parallelflow assumption and admits boundary conditions in the streamwise direction ...
Effect Of Unsteady Combustion On The Stability Of Rocket Engines, Tina Morina Rice
Effect Of Unsteady Combustion On The Stability Of Rocket Engines, Tina Morina Rice
Doctoral Dissertations
Combustion instability is a problem that has plagued the development of rocketpropelled devices since their conception. It is characterized by the occurrence of highfrequency nonlinear gas oscillations inside the combustion chamber. This phenomenon degrades system performance and can result in damage to both structure and instrumentation.
The goal of this dissertation is to clarify the role of unsteady combustion in the combustor instability problem by providing the first quantified estimates of its effect upon the stability of liquid rocket engines. The combination of this research with a new system energy balance method, accounting for all dynamic interactions within a system ...