http://orcid.org/0000-0002-0461-0207
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ABSTRACT
In the current research, effects of the layout of film holes near the first-stage vane leading edge on the endwall cooling and phantom cooling of the vane suction side surface were numerically studied. The computational results indicate that the case with a positive film-hole angle achieves a higher cooling effectiveness level on the endwall and vane suction side surface compared to the case with a corresponding negative film-hole angle. Furthermore, the location of the film hole has a significant influence on the cooling performance of the endwall and vane suction side surface. In addition, the case with a smaller distance from film holes to the vane stagnation also attains a slightly higher cooling effectiveness (phantom cooling effectiveness) on the vane suction side surface.
Nomenclature
| D | = | diameter of the film hole |
| FL | = | distance from film holes to the leading edge |
| h | = | height of the vane |
| k | = | turbulent kinetic energy |
| = | mass flow rate | |
| T | = | Temperature |
| T∞ | = | mainstream temperature |
| Taw | = | adiabatic wall temperature |
| Tc | = | coolant temperature |
| x | = | lateral coordinate |
| X | = | nondimensional lateral coordinate |
| y | = | vertical coordinate |
| Y | = | nondimensional vertical coordinate |
| z | = | stream-wise coordinate |
| Z | = | nondimensional stream-wise coordinate |
| y+ | = | dimensionless wall-normal height of the first cell at the wall |
| V | = | Velocity |
| v | = | fluctuating velocity |
| Greek | = | |
| α | = | film-hole angle |
| θ | = | nondimensional temperature |
| η | = | adiabatic film-cooling effectiveness |
| = | laterally averaged film-cooling effectiveness | |
| = | area-averaged film-cooling effectiveness | |
| Subscripts | = | |
| aw | = | adiabatic wall condition |
| c | = | coolant conditions |
| in | = | inlet condition |
| rms | = | root-mean-square |
| ∞ | = | mainstream conditions |
Nomenclature
| D | = | diameter of the film hole |
| FL | = | distance from film holes to the leading edge |
| h | = | height of the vane |
| k | = | turbulent kinetic energy |
| = | mass flow rate | |
| T | = | Temperature |
| T∞ | = | mainstream temperature |
| Taw | = | adiabatic wall temperature |
| Tc | = | coolant temperature |
| x | = | lateral coordinate |
| X | = | nondimensional lateral coordinate |
| y | = | vertical coordinate |
| Y | = | nondimensional vertical coordinate |
| z | = | stream-wise coordinate |
| Z | = | nondimensional stream-wise coordinate |
| y+ | = | dimensionless wall-normal height of the first cell at the wall |
| V | = | Velocity |
| v | = | fluctuating velocity |
| Greek | = | |
| α | = | film-hole angle |
| θ | = | nondimensional temperature |
| η | = | adiabatic film-cooling effectiveness |
| = | laterally averaged film-cooling effectiveness | |
| = | area-averaged film-cooling effectiveness | |
| Subscripts | = | |
| aw | = | adiabatic wall condition |
| c | = | coolant conditions |
| in | = | inlet condition |
| rms | = | root-mean-square |
| ∞ | = | mainstream conditions |