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Research Papers

Effects of Inclination Angle, Orientation Angle, and Hole Length on Film Cooling Effectiveness of Rectangular Diffusion Holes

[+] Author and Article Information
Bai-Tao An

Institute of Engineering Thermophysics,
Chinese Academy of Sciences,
Beijing 100190, China
e-mail: anbt@mail.etp.ac.cn

Jian-Jun Liu, Si-Jing Zhou

Institute of Engineering Thermophysics,
Chinese Academy of Sciences,
Beijing 100190, China

1Corresponding author.

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received August 1, 2017; final manuscript received April 27, 2018; published online June 14, 2018. Assoc. Editor: Kenichiro Takeishi.

J. Turbomach 140(7), 071003 (Jun 14, 2018) (13 pages) Paper No: TURBO-17-1098; doi: 10.1115/1.4040101 History: Received August 01, 2017; Revised April 27, 2018

Film-cooling effectiveness of rectangular diffusion holes under an inclination angle α = 45 deg, an orientation angle β = 45 deg, and a length-to-diameter ratio of L/D = 8.5 were, respectively, examined in a flat-plate experimental facility using the pressure sensitive paint (PSP) technique. Experiments were performed at a density ratio of DR = 1.38 and a mainstream turbulence intensity of Tu = 3.5%. The semicircle sidewall rectangular diffusion hole varied at three cross-sectional aspect ratios, i.e., AS = 3.4, 4.9, and 6.6. The tested results were compared with the baseline design with an inclination angle α = 30 deg, an orientation angle β = 0 deg, and a length-to-diameter ratio L/D = 6. A three-dimensional (3D) numerical simulation method was employed to analyze the flow field. The experimental results showed that the increased inclination angle converted the bi- or tri-peak effectiveness pattern of the baseline design to a single-peak pattern, weakened the lateral diffusion of coolant, and consequently decreased cooling effectiveness obviously. The decreased magnitude amplified with the increase of cross-sectional aspect ratio and blowing ratio. The adding of orientation angle seriously weakened the cooling effectiveness of the baseline design, and the blowing ratio and cross-sectional aspect ratio had almost no effect on overall cooling effectiveness. The elongated hole length provided a uniform distribution of lateral cooling effectiveness, which produced differential effects on the bi- or tri-peak pattern. The elongated hole length decreased the cooling effectiveness on the near hole region, but had less effects on overall cooling effectiveness, except the high blowing ratio.

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Figures

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Fig. 1

Geometries of rectangular diffusion holes with a 45 deg inclination angle (left to right: AS = 3.4, AS = 4.9, and AS = 6.6)

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Fig. 2

Geometries of rectangular diffusion holes with a 45 deg orientation angle (left to right: AS = 3.4, AS = 4.9, and AS = 6.6)

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Fig. 3

Geometries of rectangular diffusion holes with a L/D = 8.5 length-to-diameter ratio (left to right: AS = 3.4, AS = 4.9, and AS = 6.6)

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Fig. 4

Schematic diagram of experimental facilities

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Fig. 5

Measured local effectiveness contours of the baseline hole [28]: (a) AS = 3.4, (b) AS = 4.9, and (c) AS = 6.6

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Fig. 6

Computational grid

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Fig. 7

Simulated local effectiveness contours of the baseline hole of AS = 4.9 under M = 1.5 and M = 2.5

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Fig. 8

Laterally averaged effectiveness comparison between numerical and experimental results of the baseline hole of AS = 4.9

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Fig. 9

Simulated local velocity distribution on the cutting plane near the downstream hole of the wall at M = 1.5: (a) baseline design, (b) α = 45 deg, (c) β = 45 deg, and (d) L/D = 8.5

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Fig. 10

Simulated velocity vector streamline and nondimensional temperature contours on x/D = 5 plane at M = 1.5: (a) baseline design, (b) α = 45 deg, (c) β = 45 deg, and (d) L/D = 8.5

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Fig. 11

Measured local effectiveness contours under α = 45 deg of hole: (a) AS = 3.4, (b) AS = 4.9, and (c) AS = 6.6

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Fig. 12

Measured local effectiveness at x/D = 10 under two inclination angles of hole: (a) AS = 3.4, (b) AS = 4.9, and (c) AS = 6.6

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Fig. 13

Measured laterally averaged effectiveness under two inclination angles of hole: (a) AS = 3.4, (b) AS = 4.9, and (c) AS = 6.6

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Fig. 14

Measured local effectiveness contours under β = 45 deg of hole: (a) AS = 3.4, (b) AS = 4.9, and (c) AS = 6.6

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Fig. 15

Measured local effectiveness at x/D = 10 under two orientation angles of hole: (a) AS = 3.4, (b) AS = 4.9, and (c) AS = 6.6

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Fig. 16

Measured laterally averaged effectiveness under two orientation angles of hole: (a) AS = 3.4, (b) AS = 4.9, and (c) AS = 6.6

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Fig. 17

Measured local effectiveness contours under L/D = 8.5 of hole: (a) AS = 3.4, (b) AS = 4.9, and (c) AS = 6.6

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Fig. 18

Measured local effectiveness at x/D = 10 under two hole lengths of hole: (a) AS = 3.4, (b) AS = 4.9, and (c) AS = 6.6

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Fig. 22

Simulated local effectiveness contours of hole AS = 4.9 under (a) α = 45 deg, (b) β = 45 deg, and (c) L/D = 8.5

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Fig. 21

Simulated spatially averaged effectiveness of all schemes of hole AS = 4.9

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Fig. 20

Measured spatially averaged effectiveness of all tested schemes of hole: (a) AS = 3.4, (b) AS = 4.9, and (c) AS = 6.6

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Fig. 19

Measured laterally averaged effectiveness under two hole lengths of hole: (a) AS = 3.4, (b) AS = 4.9, and (c) AS = 6.6

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