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research-article

Experimentally Measured Effects of Incidence Angle on the Adiabatic and Overall Effectiveness of a Fully Cooled Turbine Airfoil With Showerhead Shaped Holes

[+] Author and Article Information
Kyle Chavez

The University of Texas at Austin Austin, Texas, USA
Kyle.F.Chavez@utexas.edu

Thomas N. Slavens

Pratt & Whitney Hartford, Connecticut, USA
Thomas.Slavens@pw.utc.com

David G. Bogard

The University of Texas at Austin Austin, Texas, USA
dbogard@mail.utexas.edu

1Corresponding author.

ASME doi:10.1115/1.4036200 History: Received January 22, 2017; Revised February 14, 2017

Abstract

Understanding the sensitivity of film cooling to a range of inlet conditions is necessary when verifying the robustness of a cooling design. In order to do this, adiabatic and overall effectiveness data were measured at various blowing ratios on an airfoil with nine shaped hole rows. This was performed in a low-speed linear cascade at two incidence angles, an inlet Reynolds number of 120000, a turbulence intensity of 5%, and a density ratio of 1.23. The test section was first adjusted so that the airfoil pressure distribution and stagnation line matched a CFD model. Infrared thermography was then used to measure effectiveness levels. This process was then repeated for the second incidence angle. Airfoil inlet pressures for each blowing ratio were matched between incidence angles. The stagnation line position changed the laterally averaged adiabatic effectiveness by as much as 0.2 near the showerhead. The effect persisted strongly 35 hole diameters downstream of the stagnation row but was visible over the whole viewable area of 160 diameters. The showerhead was then investigated in detail and it was found that the stagnation line dramatically increased the near-hole adiabatic and overall effectiveness levels when positioned within the breakout footprint of the stagnation hole row. This is the first study to present measured effectiveness values over both the pressure- and suction-sides of a fully-cooled airfoil for appreciably off-nominal incidence angles as well as examine adiabatic and overall effectiveness levels for a conical stagnation row of holes.

Copyright (c) 2017 by ASME
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