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A numerical evaluation on the effect of sister holes on film cooling effectiveness and the surrounding flow field

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Abstract

A numerical study was performed to evaluate the effectiveness of the novel sister hole film cooling technique. Two secondary coolant holes bound the primary coolant hole slightly downstream of its midpoint, intended to minimize the primary vortex pair and improve cooling performance. An unstructured hexahedral mesh was generated and the realizable k–ε turbulence model with near-wall modeling was used in these simulations. Blowing ratios of 0.2, 0.5, 1.0, and 1.5 were simulated to evaluate the applicability of sister holes in practical applications. It was found that sister holes significantly improved cooling performance over the entire computational domain, particularly at high blowing ratios. These results arose by countering the primary vortex pair with a secondary pair from these sister holes, ultimately maintaining flow adhesion where the coolant stream would have otherwise separated.

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Abbreviations

A :

Area

D :

Diameter

DR:

Density ratio

L :

Length

M :

Blowing ratio

Ma :

Mach number

P :

Perimeter

R :

Gas constant

T :

Temperature

V :

Velocity

h :

Height

k :

Turbulent kinetic energy

p :

Pitch

s :

Row spacing

y + :

The normalized distance yu */v

z :

Coordinate in the lateral direction

ε:

Dissipation rate of turbulent kinetic energy

η:

Adiabatic effectiveness

μ:

Viscosity

ρ:

Density

ν:

Eddy viscosity

aw:

Adiabatic wall

c:

Coolant

h:

Hydraulic

t:

Turbulent

w:

Wetted

∞:

Freestream

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Acknowledgments

The authors would like to extend their thanks to the Natural Science and Engineering Research Council of Canada and the Province of Ontario for their funding towards this research. Special thanks are also due to the High Performance Computing Virtual Laboratory for their financial support and extensive resources.

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Authors and Affiliations

  1. Aero-Thermal Management Laboratory, Department of Aerospace Engineering, Ryerson University, 350 Victoria St., Toronto, ON, M5B2K3, Canada

    Marc J. Ely & B. A. Jubran

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  1. Marc J. Ely
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  2. B. A. Jubran
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Correspondence to Marc J. Ely.

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Ely, M.J., Jubran, B.A. A numerical evaluation on the effect of sister holes on film cooling effectiveness and the surrounding flow field. Heat Mass Transfer 45, 1435–1446 (2009). https://doi.org/10.1007/s00231-009-0523-8

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  • DOI: https://doi.org/10.1007/s00231-009-0523-8

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