Browsing by Author "Ahmed, Anwar"

Now showing items 21-31 of 31

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 ...

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 Active Control of Aircraft Wing Tip Vortices and Wake Turbulence

Gupta, Manjul (2011-08-17)

The present work was focused on study and application of active flow control methods to alleviate the wake turbulence problem in commercial aircraft. Sinusoidal perturbations were introduced into the tip vortex generated ...

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 ...

Numerical Investigation of the Flow Topology in a Bidirectional Vortex Engine

Sharma, Gaurav (2023-03-30) ETD File Embargoed

The characterization of swirl-driven phenomena, including cyclonic flows, continues to receive attention in the propulsion community. This may be attributed to the beneficial properties of swirl when integrated into ...

Single Camera 3D Measurement of a Shock Wave-Turbulent Boundary Layer Interaction

Bolton, Johnathan (2017-04-21)

This paper explores the 3D structure of an unswept fin generated shock wave-turbulent boundary layer interaction (SBLI). A Mach 2 flow encounters an unswept fin at an angle of attack of 15 degrees which causes an inviscid, ...

Study of aerodynamic interactions in counter-rotating coaxial rotors

Silwal, Lokesh (2023-12-06) ETD File Embargoed

Counter-rotating coaxial rotors (CCR) are ubiquitous in emerging next-generation configurations, demonstrating enhanced performance metrics such as increased forward-flight speed, flight range, and payload capabilities ...

Three-Dimensional Trajectory Optimization in Constrained Airspace

Dai, Ran (2007-12-15)

This dissertation deals with the generation of three-dimensional optimized trajectory in constrained airspace. It expands the previously used two-dimensional aircraft model to a three-dimensional model and includes the ...

Triglobal Stability Analysis of the Thermoacoustic Field in Rocket Engines

Kovacic, Paul (2020-08-14) ETD File Embargoed

One of the most daunting problems in the development of a rocket engine is the appearance of coherent oscillatory structures in the flow. Characterized primarily by fluctuations in pressure, these oscillations can sync ...

Volumetric PIV Measurement in the Wake of Wavy Cylinder

Chang, Chin Hao (2014-07-11)

The three-dimensional laminar flow over a straight cylinder with sinusoidal variation of cross-section was investigated using a volumetric Particle Image Velocimetry at Reynolds numbers of 15,000 and 20,000 and compared ...

Yaw-Roll Coupled Oscillations of a Slender Delta Wing

Worley, John (2008-08-15)

The delta wing has been a highly studied aerial planform, from counter rotating vortices to a rolling `wing rock' motion. The research done at Auburn University is an extension of those studies. This research studies not ...