Now showing items 1-10 of 20
Development of a Time-Resolved Laser-Induced Fluorescence Technique for Nonperiodic Oscillations
(2016)
Time-resolved measurements of ion dynamics could be key to understanding the physics of instabilities, electron transport, and erosion in Hall thrusters. Traditional measurements of the ion velocity distribution in Hall ...
Observations of Shear Flows in High-Energy-Density Plasmas.
(2010)
The research discussed in this thesis represents work toward the demonstration of experimental designs for creating a Kelvin-Helmholtz (KH) unstable shear layer in a high-energy-density (HED) plasma. Such plasmas are ...
Deterministic-Kinetic Computational Analyses of Expansion Flows and Current-Carrying Plasmas
(2021)
Spacecraft electric propulsion (EP) takes advantage of the ability of electric and magnetic fields to accelerate plasmas to high velocities to generate efficient thrust. The thermionic hollow cathode is a critical component ...
Control of the Electron Energy Distribution Function (EEDF) in a Hall Thruster Plasma.
(2016)
Further improvements to Hall-effect thruster (HET) efficiency in the low voltage regime will help enable more extensive space missions. HET efficiency depends on its ability to ionize and accelerate neutral propellant, ...
Cathode Spot Injection of Dielectric Particles with Applications for Communications Blackout Plasma Depletion.
(2012)
Vehicles traveling at hypersonic velocities in the atmosphere are readily enveloped by a dense plasma layer that blocks, reflects, and significantly attenuates radio signals typically used for communications. This problem ...
Piezoelectric Impedance-Based Structural Health Monitoring using Bistable and Adaptive Piezoelectric Circuitry
(2017)
Structural health monitoring (SHM) has been extensively explored for various aerospace, civil, and mechanical systems due to its significant importance in enhancing life-safety and economic benefits. Among various SHM ...
Efficient Output-Based Adaptation Mechanics for High-Order Computational Fluid Dynamics Methods
(2018)
As numerical simulations are applied to more complex and large-scale problems, solution verification becomes increasingly important in ensuring accuracy of the computed results. In addition, although improvements in ...
An Experimental Investigation of Premixed Combustion in Extreme Turbulence
(2017)
This work has explored various aspects of high Reynolds number combustion
that have received much previous speculation. A new high-Reynolds number
premixed Bunsen burner, called Hi-Pilot, was designed to produce ...
Large-Scale Simulations of Complex Turbulent Flows: Modulation of Turbulent Boundary Layer Separation and Optimization of Discontinuous Galerkin Methods for Next-Generation HPC Platforms
(2020)
The separation of spatially evolving turbulent boundary layer flow near regions of adverse pressure gradients has been the subject of numerous studies in the context of flow control. Although many studies have demonstrated ...
Reduced-Order Modeling of Turbulent Reacting Flows Using Inertial Manifold Theory
(2021)
Turbulent flows found in aerodynamics, propulsion, and other energy conversion sys- tems pose an inherent computational challenge for extensive predictive simulations. Over the last few decades, a statistical approach for ...