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Download Fathi Finaish Broad Areas of Research Interests: Aerodynamics
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Fathi Finaish Broad Areas of Research Interests: Aerodynamics/Fluid Dynamics Specific Research Interests: Aerodynamic testing, unsteady flows, vortex dynamics in separated flows, physical and numerical flow visualizations, active flow control, and flow mixing. Areas of Teaching Responsibility: Aerodynamics, fluid dynamics, design, and experimental methods. Description of Scholarly Expertise: External Flows: A variety of factors have led to a surge in present interest in low Reynolds number aerodynamics. For instance, recent interest in renewable energy has resulted in growing interest in wind turbines and related technologies. Recent advancements in the fields of micro-system technology have enabled the development of mini- and micro aerial vehicles, which have a broad range of potential applications. The development of aircraft on such a small scale has led to a variety of previously rarely encountered low Reynolds number phenomena, such as Laminar Separation Bubbles (LSB). Our current efforts are focused on investigating the feasibility of employing plasma actuators as a means of controlling LSB. Both steady and unsteady plasma actuation modes are being investigated. In our recent efforts, a plasma actuator, modeled as a localized body force, is applied to the airfoil surface, and used to effect changes in the characteristics of the bubble and the airfoil aerodynamic performance. Parametric studies are conducted for both the steady and pulsed actuator configuration to determine the optimal configurations of the actuator in each case. The pulsed and steady control methods are compared to determine the advantages gained by pulsing the actuator. Additionally, power and voltage requirements of the plasma actuator are estimated in order to gauge the practicality and effectiveness of the proposed LSB control method. Internal Flows: Poor mixing between the warm return air and the cold outside air often leads to air stratification in Air Handling Units, which results in various problems, such as, nuisance trips of low temperature safety thermostats, freezing of chilled or hot water coils in a stratified subfreezing air stream and loss of control when sensors cannot read the true temperature of the air stream. Our most recent efforts are focusing on quantifying mixing characteristics such as thermal statistic and range mixing effectiveness and investigating the influence of flow baffles on flow mixing and produced pressure drop. Laboratory Location: 334 Toomey Laboratory Description: This laboratory houses an 18"x18" subsonic wind tunnel. This tunnel is an open return type capable of producing flow speeds up to 90 mph in an 18"x18" square test section. Flow turbulence is controlled by a combination of three anti-turbulence screens and honeycomb panel installed in the tunnel-settling chamber. The tunnel is equipped with three interchangeable test sections that can easily be installed downstream of a 6.25:1 contraction. Test models, a lighting system, and a movie camera are available and can be employed to visualize flow developments over various test models. Also, this laboratory houses a 10”x10" subsonic wind tunnel. This tunnel is a variable density wind tunnel used for flow testing under controlled conditions of flow temperature, pressure, and humidity. This facility is designed to test performance of airflow instruments as well as aerodynamic performance of models in variable density environments. Heating, cooling, humidification arrangements, along with measuring instruments are incorporated into the tunnel to provide for accurate control and monitoring of flow properties. The tunnel is equipped with a 10"x10" test section where the static absolute pressure, temperature, and humidity can be varied in ranges between 5-20 psia (34-137 kPa), 50-250oF (10121oC), and 0.003-0.012 lbv/lba (kgv/kga) respectively. The tunnel is equipped with an arrangement suitable for generating a second flow for investigating flow mixing of air streams with dissimilar temperatures and flow velocities.