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research-article

INFLUENCE OF SCALING PARAMETERS AND GAS PROPERTIES ON OVERALL EFFECTIVENESS ON A LEADING EDGE SHOWERHEAD

[+] Author and Article Information
Connor Wiese

Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio 45433
connor.wiese.1@us.af.mil

Carol Bryant

Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio 45433
southardcarol@gmail.com

James L. Rutledge

Air Force Institute of Technology, Wright-Patterson Air Force Base, Ohio 45433
james.rutledge@us.af.mil

Marc D. Polanka

Air Force Institute of Technology, Wright-Patterson Air Force Base, Ohio 45433
marc.polanka@afit.edu

1Corresponding author.

ASME doi:10.1115/1.4041292 History: Received August 15, 2018; Revised August 22, 2018

Abstract

Testing new turbine cooling schemes at engine conditions becomes cost prohibitive as gas-path temperatures increase. As a result, turbine components are simulated in a laboratory with a large-scale model that is sized and constructed out of a selected material so that the Biot number is matched between the laboratory and engine conditions. Furthermore, the experimental temperatures are lower, so the surface temperature that the metal component would experience is scaled via the overall cooling effectiveness, phi. Properly measuring phi requires that the relevant flow physics must be matched, thus the Reynolds numbers ismatched—both those of the freestream and the coolant, as well as the other scaling parameters, such as the mass flux, momentum flux, and velocity ratios. However, if the coolant-to-freestream density ratio does not match that of the engine condition, the mass flux, momentum flux, coolant and freestream Reynolds numbers, and coolant-to-freestream velocity ratios cannot be matched simultaneously to the engine condition. Furthermore, the coolant thermal transfer properties are unaccounted for in these parameters, despite their large influence on the resultant overall effectiveness. While much research has focused on the effects of the coolant-to-freestream density ratio, this study examines the influence of other thermodynamic properties, in particular the specific heat, which differ substantially between experimental and engine conditions. This study demonstrates the influence of various coolant properties on the overall effectiveness distribution on a leading edge by selectively matching M, I, and ACR with air, argon, and carbon dioxide coolants.

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