Scot Waye

The University of Texas at Austin

High Resolution Film Cooling Effectiveness Measurements of Axial Holes embedded in a Transverse Trench with Various Trench Configurations

Adiabatic film cooling effectiveness of axial holes embedded within a transverse trench on the suction side of a turbine vane was investigated. High resolution two dimensional data obtained from IR thermography and corrected for local conduction provided spatial adiabatic effectiveness data. Flow parameters of blowing ratio, density ratio, and turbulence intensity were independently varied. In addition to a baseline geometry, nine trench configurations were tested, all with a depth of _ hole diameter, with varying widths, and with perpendicular and inclined trench walls. A perpendicular trench wall at the very downstream edge of the coolant hole was found to be the key trench characteristic that yielded much improved adiabatic effectiveness performance. This configuration increased adiabatic effectiveness up to 100% near the hole and 40% downstream. All other trench configurations had little effect on the adiabatic effectiveness. Thermal field measurements confirmed that the improved adiabatic effectiveness that occurred for a narrow trench with perpendicular walls was due a lateral spreading of the coolant and reduced coolant jet separation. The cooling levels exhibited by these particular geometries are comparable to shaped holes, but much easier and cheaper to manufacture.

Ty Webb

Applied Research Laboratories
The University of Texas at Austin

System-Level Thermal Management of Pulsed Loads on an All-Electric Ship

With the US Navy's development of the integrated electric warship, large amounts of electrical energy will be made available, thus allowing the addition of pulsed weaponry and sensors. Electromagnetic railguns will increase the thermal load on such a ship by an order of magnitude or more over a conventional gun. To represent the expected loads, a numerical model has been created to simulate the system-level energy balance for a capacitive based railgun system and is currently in development for a rotating machine based system. In order to better study the system-level effects of the increased thermal burden, multiple shot profiles and scenarios were used. The simulation outputs are used as inputs to a ship-based, thermal management architecture built in the dynamic thermal software package ProTRAX. This analysis quantifies additional thermal management capacity that will be necessary for the future all-electric ship and provides the first step in simulating potential ship wide thermal management systems of pulsed loads in a dynamic sense.

Friday, April 14, 2006, at NOON
ETC 7.146

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