Effects of Effusion Cooling Patterns Near the Dilution Hole for a Double-Walled Combustor Liner - Part 2: Flowfield Measurements

[+] Author and Article Information
Adam Shrager

Mem. ASME, Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, 127 Reber Building, University Park, PA 16802

Karen A. Thole

Mem. ASME, Department of Mechanical and Nuclear Engineering, The Pennsylvania State University 136 Reber Building, University Park, PA 16802

Dominic Mongillo

Pratt & Whitney, 400 Main Street, East Hartford, CT 06118

1Corresponding author.

ASME doi:10.1115/1.4041153 History: Received July 08, 2018; Revised July 23, 2018


The complex flowfield inside a gas turbine combustor creates a difficult challenge in cooling the combustor walls. Many modern combustors are designed with a double-wall that contain both impingement cooling on the backside and effusion cooling on the external side. Complicating matters is the fact that these double-walls also contain large dilution holes whereby the cooling film from the effusion holes is interrupted by the high-momentum dilution jets. Given the importance of cooling the entire panel, including the metal surrounding the dilution holes, the focus of this paper is understanding the flow in the region near the dilution holes. Near-wall flowfield measurements are presented for three different effusion cooling hole patterns near the dilution hole. The effusion cooling hole patterns were varied in the region near the dilution hole and include: no effusion holes; effusion holes pointed radially outward from the dilution hole; and effusion holes pointed radially inward toward the dilution hole. Particle image velocimetry (PIV) was used to capture the time-averaged flowfield. Results showed evidence of downward motion at the leading edge of the dilution hole for all three effusion hole patterns. In comparing the three geometries, the outward effusion holes showed significantly higher velocities toward the leading edge of the dilution jet relative to the other two geometries. Although the flowfield generated by the dilution jet dominated the flow downstream, each cooling hole pattern interacted with the flowfield uniquely. Approaching freestream turbulence did not have a significant effect on the flowfield.

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