Flow Physics of Diffused-Exit Film Cooling Holes Fed by Internal Crossflow

[+] Author and Article Information
John McClintic

The University of Texas at Austin, 204 E. Dean Keeton St, Austin, TX 78712

Dale Fox

The University of Texas at Austin, 204 E. Dean Keeton St, Austin, TX 78712

Fraser Jones

The University of Texas at Austin, 204 E. Dean Keeton St, Austin, TX 78712

Dr. David G. Bogard

The University of Texas at Austin, 204 E. Dean Keeton St, Austin, TX 78712

Dr. Tom Dyson

GE Global Research Center, 1 Research Circle, Schenectady, NY 12309

Zachary Webster

GE Aviation, 1 Neumann Way, Cincinnati, OH 45125

1Corresponding author.

ASME doi:10.1115/1.4042166 History: Received November 09, 2018; Revised November 26, 2018


Internal crossflow, or internal flow that is perpendicular to the overflowing mainstream, reduces film cooling effectiveness by disrupting the diffusion of coolant at the exit of axial shaped holes. Previous experimental investigations have shown that internal crossflow causes the coolant to bias toward one side of the diffuser and that the severity of the biasing scales with the inlet velocity ratio, VRi, or the ratio of crossflow velocity to the jet velocity. It has been hypothesized and computationally predicted that internal crossflow produces an asymmetric swirling flow within the hole that causes the coolant to bias in the diffuser and that biasing contributes to ingestion of hot mainstream gas into the hole, which is undesirable. However, there are no experimental measurements to confirm these predictions. In the present study, in and near-hole flow field and thermal field measurements were performed, investigating the flow structures and mainstream ingestion for a standard axial shaped hole fed by internal crossflow. Three different inlet velocity ratios of VRi = 0.24, 0.36, and 0.71 were tested. Measurements were made in planes normal to the nominal direction of coolant flow, at the outlet plane of the hole and at two downstream locations. The predicted swirling structure was observed for the highest inlet velocity ratio and flow within the hole was shown to scale with VRi. Ingestion within the diffuser was significant and also scaled with VRi. Downstream flow and thermal fields showed that biasing contributed to severe jet detachment and coolant dispersion downstream.

Copyright (c) 2018 by ASME
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