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2016 Ph.D. Defenses

Nov

10

2016

PhD Candidate Adam Hickman - "The Transition from Rotating Stall to Surge in an Axial Compressor"

WHERE: B029 Hessert Laboratory
FROM: 2:30PM TO 5:00PM

This research investigated unsteady events such as stall inception, stall cell development, and surge. Stall is characterized by a decrease in overall pressure rise and non-axisymmetric through-flow. Compressor stall can lead to surge which is characterized by quasi-axisymmetric fluctuations in mass flow and pressure.

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Oct

28

2016

PhD Candidate Nicholas Giovanni De Lucca - "Studies of the Pressure Field and Related Beam Jitter for Hemisphere-on-Cylinder Turrets"

WHERE: 103 Multidisciplinary Research Building
FROM: 3:00PM TO 5:30PM

Beam jitter is defined as the unsteady variation of a laser beam’s propagation direction. For airborne directed energy systems that feature turrets, the high speed flow around the aircraft introduces jitter into the system. The jitter has two main forms: mechanical jitter from vibration induced by the unsteady pressure field over the turret and aero-optical jitter from large scale structures that impose aberrations with length scales larger than the beam aperture.

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Oct

7

2016

PhD Candidate Kyle Heintz - "Experimental Investigation on the Effects of Non-Cyclical Frequency and Amplitude Variation on Dynamic Stall"

WHERE: 103 Multidisciplinary Research Building
FROM: 9:00AM TO 11:00AM

An experimental study of a cambered airfoil undergoing non-cyclical, transient pitch trajectories and the resulting effects on the dynamic stall phenomenon is presented. Surface pressure measurements and airfoil incidence angle are acquired simultaneously to resolve instantaneous aerodynamic load coefficients at Mach numbers ranging from 0.2 to 0.4. Derived from these coefficients are various formulations of the aerodynamic damping factor, referred to copiously throughout.

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Aug

30

2016

PhD Candidate Na Yu - "Model-Based Design Optimization and Predictive Control to Minimize Energy Consumption of a Building"

WHERE: 258 Fitzpatrick Hall of Engineering
FROM: 3:00PM TO 5:30PM

Current research has shown that building energy consumption contributes to more than 40% of the total energy use in United States. In recent years, the investigation of the reduction of a building's energy consumption, both at the design stage and operational stage, has received great attention. To obtain an optimal design and improve energy efficiency during operation, a reliable building energy model is needed to incorporate the important static and dynamic information from various resources.

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Aug

22

2016

PhD Candidate Tamuto Takakura - "Entropy Generation in the Tip Region of a High-Pressure Turbine"

WHERE: B029 Hessert Laboratory
FROM: 9:00AM TO 12:00PM

This research investigated loss mechanisms from tip-clearance flows in a high- pressure turbine. Unshrouded tips of turbine blades are subject to a pressure driven flow phenomenon from the pressure to suction surface. This flow feature, known as tip-clearance flows, is a major loss contributor in axial flow turbines. Both experimen- tal and computational data were acquired to study entropy generation.

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