Browsing by Author "Hartfield, Roy"

Now showing items 21-40 of 54

Development of a 3-D Fluid Velocimetry Technique based on Light Field Imaging

Lynch, Kyle (2011-05-04)

A novel method for performing 3-D particle image velocimetry is developed and demonstrated. The technique is based on light field photography, which uses a dense lenslet array mounted near a camera sensor to simultaneously ...

Development of a High Speed Three-dimensional Flow Visualization Technique

Satija, Aman (2007-12-15)

A high-speed three-dimensional flow visualization technique has been developed. The technique involves the generation of laser pulses at a high repetition rate, which are subsequently converted to sheets of light and ...

Development of a Multi-band Plenoptic Camera for High Temperature Measurements

Kelly, Dustin (2020-05-13)

In this thesis, the development of a novel multi-band plenoptic pyrometer is discussed and applied to several applications of interest in the engineering field. The multi-band plenoptic camera is a non-contact measurement ...

Development of a Two Dimensional, Optically Accessible, Hybrid Rocket Motor

Boyle, Sadie (2019-09-06)

Traditionally, launch vehicles and in-space vehicles use solid rocket motors (SRM) and liquid rocket engines (LRE) to propel them into and through space. However, there are many drawbacks to both propulsion systems. Hybrid ...

Dynamic Stability and Control: Methods and Developments

Heiser McDaniel, Melissa (2017-01-10)

The purpose of this work is to assess the overall usage, evaluation, and understanding of damping derivatives with a focus on accuracy needs and computational efficiency. With the increased usage of neutrally stable and/or ...

Dynamics of Secondary Steady State Flows in a Combined Taylor-Couette and Escudier Vortex Breakdown Flow Field

Waldheim, Jordan (2022-05-10)

Effects of a varying height end-wall on the bifurcation and stability of secondary steady state flows within the annular gap of a Taylor-Couette cell were investigated. Experiments were conducted at four different end-wall ...

Effect of In Phase and Out of Phase Forcing on Circular Cylinder Wake

Moore, Michael Hayden, Jr. (2013-01-03)

Using periodic forcing, the control of instabilities in the wake of a circular cylinder was investigated. The cylinder model had two straight slits, one on each side, that were connected to separate low frequency and high ...

Effect of Random Noise and Gaussian Noise Forcing on the Wake of a Circular Cylinder

Gambhir, Venkat Praveen (2015-05-11)

Flow over a bluff body has been a topic of extensive investigation, due to a variety of engineering problems such as vortex induced vibrations, unsteady forces and noise associated with the periodic flow in the wake. The ...

Engineering and Statistical Analysis of Solid and Liquid Missile Systems

Cervantes, Noel (2022-12-05)

Engineering and statistical analysis is applied to gain insights and information regarding liquid and solid missile systems. This dissertation outlines five main key topic areas, physics modeling, data generation, model ...

Enhancing Image Resolvability in Obscured Environments Using 3D Deconvolution and a Plenoptic Camera

Bolan, Jeffrey (2015-05-08)

Light field imaging with a plenoptic camera is an emerging flow diagnostic technique capable of capturing three dimensional information about a given volume or flow from a single plenoptic image. Translucent occlusions ...

An Evolutionary Strategies Method to Optimize Turbine and Compressor Blades

Cervantes, Noel (2018-04-23)

The main goal of this study is to improve a two-dimensional optimization scheme for turbine and compressor blades, specifically by improving the overall efficiency of each blade row with respect to objective and penalty ...

Examination of FlightStream for Proximity Flight with Stores

Todd, Eric (2017-07-27)

The goal of the following work was to validate and demonstrate the capability of the FlightStream solver to model proximity flight. To this end, wind tunnel proximity data for a MK-82SE bomb released from an F-16 was used ...

Experimental and Computational Investigation of a Turbofan Inlet Duct

Hall, Zachary (2009-11-20)

The flow field of an axisymmetric turbofan inlet was investigated experimentally and computationally. Flow visualization results were obtained using LIF, hydrogen bubbles, and PIV. Incidence angle was determined to be a ...

An Experimental Investigation of Roll and Yaw Coupled Oscillations of a Delta Wing

Walker, John (2011-05-03)

An experimental investigation was undertaken to study roll and yaw coupled oscillation of a delta wing. Results indicated that the oscillations started at a mean α = 29 for all cases. Beyond which the amplitude of oscillations ...

An Experimental Study of the Propagation of Equivalence Ratio Oscillations on their Effect on Combustion Instabilities

Walker, Josh (2019-04-23)

Lean premixed combustors have become a promising method in gas turbine engines to operate more efficiently and within the regulatory standards for emissions. However, this lean premixed operation is susceptible to combustion ...

Flow Around Axisymmetric and Two-dimensional Forward-Facing Cavities

Rifki, Rifki (2006-05-15)

Flowfield of axisymmetric and two-dimensional forward facing cavities was investigated. Flow visualization results obtained using PLIF and hydrogen bubbles were used to develop a generic flow topology consisting of a ...

Investigation of Plasma Detachment from a Magnetic Nozzle

Chancery, William (2007-08-15)

The Variable Specific Impulse Magnetoplasma Rocket (VASIMR) electric space propulsion concept currently under development by the Ad Astra Rocket Company utilizes a magnetic field to confine a propellant plasma. The energetic ...

Investigation of the Characteristics of an Axisymmetric Jet Subjected to Azimuthal Forcing

Weiner, Arthur (2013-05-15)

Characteristics of an axisymmetric jet subjected to azimuthal forcing were investigated. A circular variable diameter iris was positioned near the nozzle exit to impart azimuthal excitation to the jet at desired Strouhal ...

Launch Vehicle Performance Enhancement Using Aerodynamic Assist

McDavid, Brian (2008-08-15)

A complete preliminary design model of a three-stage solid-fuel launch vehicle has been combined with a genetic algorithm to perform an optimization study with the goal to enhance performance using aerodynamic assist. ...

A Method For Obtaining New Conservation Quantities and a Solution Method For the N-Body Collision

Holmes, Eric (2019-08-15)

Exact, numerical, and perturbative methods are commonly used to solve dynamical systems of equations. Many systems’ solutions cannot be written in terms of elementary functions thus numerical and perturbative solutions ...