Cooling Effectiveness for a Shaped Film Cooling Hole at a Range of Compound Angles

[+] Author and Article Information
Shane Haydt

Mechanical and Nuclear Engineering Department, The Pennsylvania State University, University Park, PA, USA

Stephen Lynch

Mechanical and Nuclear Engineering Department, The Pennsylvania State University, University Park, PA, USA

1Corresponding author.

ASME doi:10.1115/1.4041603 History: Received September 07, 2018; Revised September 27, 2018


The present work aims to understand the effect that a compound angle has on the flowfield and adiabatic effectiveness of a shaped film cooling hole. Five orientations of the public 7-7-7 shaped film cooling hole were tested, from a streamwise oriented hole (0° compound angle) to a 60° compound angle hole, in increments of 15°. Additionally, two pitchwise spacings of P/D=3 and 6 were tested to examine the effect of hole-to-hole interaction. All cases were tested at a density ratio of 1.2 and blowing ratios ranging from 1.0 to 4.0. Experimental results show that increasing compound angle leads to increased lateral spread of coolant, and enables higher laterally-averaged effectiveness at high blowing ratios. A smaller pitchwise spacing leads to more complete coverage of the endwall, and has higher laterally averaged effectiveness even when normalized by coverage ratio, suggesting that hole to hole interaction is important for compound angled holes. Steady RANS CFD was not able to capture the exact effectiveness levels, but did predict many of the observed trends. The lateral motion of the coolant jet was also quantified, both from the experimental data and the CFD prediction, and as expected, holes with a higher compound angle and higher blowing ratio have greater lateral motion, which generally also promotes hole-to-hole interaction.

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