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Research Papers

Effect of Geometry Variations on the Cooling Performance of Fan-Shaped Cooling Holes

[+] Author and Article Information
Christian Saumweber

 Institut für Angewandte Thermo-und Fluiddynamik, Hochschule Mannheim, 68163, Germanyc.saumweber@hs-mannheim.de

Achmed Schulz

 Institut für Thermische Strömungsmaschinen, Karlsruher Institut für Technologie, 76131, Germanyachmed.schulz@kit.edu

J. Turbomach 134(6), 061008 (Aug 27, 2012) (16 pages) doi:10.1115/1.4006290 History: Received March 14, 2011; Revised June 16, 2011; Published August 27, 2012; Online August 27, 2012

The flow conditions at both the cooling hole exit as well as the cooling hole entrance affect the cooling performance downstream of cylindrical and fan-shaped holes in a very different way. The conseqences of a change in a flow parameter very obviously depend on the respective hole geometry. To gain an as complete as possible view of the specific effects of varying operating conditions and hence an enhanced understanding of the dominating mechanisms, a variation of the hole geometry is imperative. The expansion angle of the diffuser, the inclination angle of the hole, and the length of the cylindrical part at the hole entrance are considered to be the most important geometric parameters of diffuser holes. The effect of a change of exactly these parameters on the film cooling performance will be analyzed. For a better assessment of the characteristic effects associated with contouring of the hole, every diffuser hole is compared to an adequate cylindrical hole. The comparison will be performed by means of discharge coefficients and local and laterally averaged adiabatic film cooling effectiveness and heat transfer coefficients derived from experiments.

Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 6

Effect of coolant cross-flow Mach number on laterally averaged film cooling effectiveness of fan-shaped holes with 6 deg (left) and 10 deg diffuser angle (right)

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Figure 7

Effect of coolant cross-flow Mach number on surface averaged film cooling effectiveness of fan-shaped holes with various diffuser angles (M = 1.0)

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Figure 8

Effect of inclination angle on local film cooling effectiveness of a cylindrical hole (Mac  = 0.0)

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Figure 9

Effect of inclination angle on local film cooling effectiveness of a fan-shaped hole (Mac  = 0.0)

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Figure 10

Effect of inclination angle on laterally averaged film cooling effectiveness of a cylindrical hole (left) and a fan-shaped hole (right) (Mac  = 0.0)

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Figure 12

Effect of inclination angle on local film cooling effectiveness of a cylindrical hole at cross-flow in the coolant passage (Mac  = 0.29)

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Figure 13

Effect of inclination angle on local film cooling effectiveness of a fan-shaped hole at cross-flow in the coolant passage (Mac  = 0.29)

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Figure 14

Combined effect of inclination angle and coolant cross-flow on laterally averaged film cooling effectiveness of a cylindrical hole

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Figure 16

Effect of inclination angle on surface averaged film cooling effectiveness of a cylindrical hole (left) and a fan-shaped hole (right) at varying flow conditions in the coolant passage

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Figure 17

Effect of inclination angle on discharge coefficients of cylindrical (left) and fan-shaped holes (right)

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Figure 18

Pressure field affected by the location of the exiting coolant jet (cp. Rowbury [42]).

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Figure 19

Local film cooling effectiveness of cylindrical holes with L/D = 6 (top row) and L/D = 10 (bottom row) at varying blowing rates (Mac  = 0.0)

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Figure 20

Local film cooling effectiveness of fan-shaped holes with L/D = 6 (top row) and L/D = 10 (bottom row) at varying blowing rates (Mac  = 0.0)

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Figure 21

Effect of hole length on laterally averaged film cooling effectiveness of cylindrical (left) and fan-shaped holes (right) (Mac  = 0.0)

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Figure 22

Effect of hole length on laterally averaged related heat transfer coefficients of cylindrical (left) and fan-shaped holes (right) (Mac  = 0.0)

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Figure 27

Effect of hole length on surface averaged film cooling effectiveness of cylindrical (left) and fan-shaped holes (right)

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Figure 28

Effect of hole length on discharge coefficients of cylindrical (left) and fan-shaped holes (right)

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Figure 4

Effect of expansion angle on surface averaged film cooling effectiveness (Mac  = 0.0)

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Figure 5

Effect of coolant cross-flow Mach number on local film cooling effectiveness of a fan-shaped hole with 6 deg diffuser angle

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Figure 11

Effect of inclination angle on laterally averaged related heat transfer coefficients of a cylindrical hole (left) and a fan-shaped hole (right) (Mac  = 0.0)

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Figure 15

Combined effect of inclination angle and coolant cross-flow on laterally averaged film cooling effectiveness of a fan-shaped hole

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Figure 1

Basic designs of film cooling holes

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Figure 2

Effect of expansion angle on local film cooling effectiveness at various blowing rates (Mac  = 0.0)

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Figure 3

Laterally averaged film cooling effectiveness (left) and related heat transfer coefficients (right) at various expansion angles (Mac  = 0.0)

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Figure 23

Local film cooling effectiveness of a cylindrical hole with L/D = 6 (top row) and L/D = 10 (bottom row) at cross-flow in the coolant passage (Mac  = 0.29)

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Figure 25

Combined effect of hole length and coolant cross-flow Mach number on laterally averaged film cooling effectiveness of a cylindrical hole

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Figure 24

Local film cooling effectiveness of a fan-shaped hole with L/D = 6 (top row) and L/D = 10 (bottom row) at cross-flow in the coolant passage (Mac  = 0.29)

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Figure 26

Combined effect of hole length and coolant cross-flow Mach number on laterally averaged film cooling effectiveness of a fan-shaped hole

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