Research Papers

Effects of Effusion Cooling Pattern Near the Dilution Hole for a Double-Walled Combustor Liner—Part 1: Overall Effectiveness Measurements

[+] Author and Article Information
Adam C. Shrager

Department of Mechanical and
Nuclear Engineering,
The Pennsylvania State University,
127 Reber Building,
University Park, PA 16802
e-mail: adam.shrager@gmail.com

Karen A. Thole

Department of Mechanical and
Nuclear Engineering,
The Pennsylvania State University,
136 Reber Building,
University Park, PA 16802
e-mail: kthole@psu.edu

Dominic Mongillo

Pratt & Whitney,
400 Main Street,
East Hartford, CT 06118
e-mail: dominic.mongillo@pw.utc.com

1Corresponding author.

Manuscript received July 8, 2018; final manuscript received July 22, 2018; published online October 15, 2018. Editor: Jerzy T. Sawicki.

J. Eng. Gas Turbines Power 141(1), 011022 (Oct 15, 2018) (10 pages) Paper No: GTP-18-1463; doi: 10.1115/1.4041148 History: Received July 08, 2018; Revised July 22, 2018

The complex flow field in a gas turbine combustor makes cooling the liner walls a challenge. In particular, this paper is primarily focused on the region surrounding the dilution holes, which is especially challenging to cool due to the interaction between the effusion cooling jets and high-momentum dilution jets. This study presents overall effectiveness measurements for three different cooling hole patterns of a double-walled combustor liner. Only effusion hole patterns near the dilution holes were varied, which included: no effusion cooling; effusion holes pointed radially outward from the dilution hole; and effusion holes pointed radially inward toward the dilution hole. The double-walled liner contained both impingement and effusion plates as well as a row of dilution jets. Infrared thermography was used to measure the surface temperature of the combustor liners at multiple dilution jet momentum flux ratios and approaching freestream turbulence intensities of 0.5% and 13%. Results showed that the outward and inward geometries were able to more effectively cool the region surrounding the dilution hole compared to the closed case. A significant amount of the cooling enhancement in the outward and inward cases came from in-hole convection. Downstream of the dilution hole, the interactions between the inward effusion holes and the dilution jet led to lower levels of effectiveness compared to the other two geometries. High freestream turbulence caused a small decrease in overall effectiveness over the entire liner and was most impactful in the first three rows of effusion holes.

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Fig. 1

Illustration of the combustor simulator test section

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Fig. 2

Illustration of the center portion (33% of the span) of the test panel including the effusion and impingement plates with a pitchwise spacing of the dilution holes at 2.1D. The measurement area is defined by the box enclosing the central dilution holes and the centerline plane is defined by the line along the central dilution hole.

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Fig. 3

Illustration of the effusion and impingement holes detailing the geometry and parameters. Note for the top down view, solid lines indicate effusion holes and dashed lines indicate impingement holes.

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Fig. 4

Cross-sectional view of the cooling patterns near the dilution hole for the (a) closed, (b) outward, and (c) inward cases, along the centerline plane as defined in Fig. 2

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Fig. 5

Local effusion momentum flux ratio, Ieff, normalized by inlet effusion momentum flux ratio, Ieff,in, for each of the flow conditions

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Fig. 6

Overall effectiveness contour plots for the (a) closed, (b) outward, and (c) inward geometries at ID = 30 and Tu = 13%

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Fig. 7

Figures 7(a)7(c) show a close-up of the effectiveness around the dilution holes for the three cases. Note that the dark blue effectiveness is where the external effusion jets are located and the drawn in circles that are superimposed provide the locations of the impingement jets.

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Fig. 8

Centerline overall effectiveness near the dilution hole plot at ID = 30 and Tu = 13% near the dilution hole

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Fig. 9

(a) Inner and outer ring effectiveness surrounding the dilution hole at ID = 30 and Tu = 13% and (b) contour plots of the region surrounding the dilution hole illustrating the inner and outer ring areas as well as the axis of rotation

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Fig. 10

Laterally averaged effectiveness at ID = 30, ID = 20, and ID = 11 at Tu = 13% for (a) the closed cases compared to the outward cases and (b) the closed cases compared to the inward cases

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Fig. 11

Area-averaged overall effectiveness for ID = 11, 20, and 30, upstream of the dilution holes (−2.0 < x/D < −0.5) and downstream of the dilution hole (0.5 < x/D < 4.4) for Tu = 13% with error bars displaying precision uncertainty

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Fig. 12

Laterally averaged effectiveness at ID = 30 for Tu = 0.5% and Tu = 13%

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Fig. 13

Area-averaged overall effectiveness at ID = 30 upstream of the dilution holes (−2.0 < x/D < −0.5) and downstream of the dilution hole (0.5 < x/D < 4.4) for Tu = 0.5% and Tu = 13% with error bars of precision uncertainty



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