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Research Papers

Experimental and Numerical Investigations of Effects of Flow Control Devices Upon Flat-Plate Film Cooling Performance

[+] Author and Article Information
Hirokazu Kawabata

Department of Mechanical Engineering,
Iwate University,
Morioka, Japan
e-mail: kawabata04@gmail.com

Ken-ichi Funazaki

Department of Mechanical Engineering,
Iwate University,
Morioka, Japan
e-mail: funazaki@iwate-u.ac.jp

Ryota Nakata

Department of Mechanical Engineering,
Iwate University,
Morioka, Japan
e-mail: nakataryota0326@gmail.com

Daichi Takahashi

Department of Mechanical Engineering,
Iwate University,
Morioka, Japan
e-mail: daichi038@gmail.com

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received July 16, 2013; final manuscript received July 25, 2013; published online December 10, 2013. Editor: Ronald Bunker.

J. Turbomach 136(6), 061021 (Dec 10, 2013) (11 pages) Paper No: TURBO-13-1159; doi: 10.1115/1.4025689 History: Received July 16, 2013; Revised July 25, 2013

This study deals with the experimental and numerical studies of the effect of flow control devices (FCDs) on the film cooling performance of a circular cooling hole on a flat plate. Two types of FCDs with different heights are examined in this study, where each of them is mounted to the flat plate upstream of the cooling hole by changing its lateral position with respect to the hole centerline. In order to measure the film effectiveness as well as heat transfer downstream of the cooling hole with upstream FCD, a transient method using a high-resolution infrared camera is adopted. The velocity field downstream of the cooling hole is captured by 3D laser Doppler velocimeter (LDV). Furthermore, the aerodynamic loss associated with the cooling hole with/without FCD is measured by a total pressure probe rake. The experiments are carried out at blowing ratios ranging from 0.5 to 1.0. In addition, numerical simulations are also made to have a better understanding of the flow field. LES approach is employed to solve the flow field and visualize the vortex structure around the cooling hole with FCD. When a taller FCD is mounted to the plate, the film effectiveness tends to increase due to the vortex structure generated by the FCD. As FCD is laterally shifted from the centerline, the film effectiveness increases, while the lift-off of cooling air is also promoted when FCD is put on the center line.

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References

Figures

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Fig. 1

Experimental apparatus

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Fig. 5

Total pressure probe rake

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Fig. 6

Measurement plane and grid (aerodynamic investigations)

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Fig. 7

Measurement plane and grid (LDV measurement)

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Fig. 4

Measurement plane and grid (temperature measurement)

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Fig. 12

Spatially averaged film effectiveness

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Fig. 13

Local temperature on normal planes to model surface (a) BR = 0.5 and (b) BR = 1.0

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Fig. 14

Distribution of total pressure loss coefficient

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Fig. 15

Mass averaged total pressure loss coefficient

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Fig. 8

Computational domain

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Fig. 9

Computational grid

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Fig. 2

Test model and flow control devices employed

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Fig. 16

Velocity fields at x/d = 3.0 (a) normalize U-velocity and (b) vorticity

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Fig. 10

Film effectiveness and heat transfer coefficient distribution for BR = 0.5 (a) film effectiveness and (b) heat transfer coefficient

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Fig. 11

Film effectiveness and heat transfer coefficient distribution for BR = 1.0 (a) film effectiveness and (b) heat transfer coefficient

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Fig. 17

Vortex structures

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