Abstract
The development of modern gas turbines requires higher turbine inlet temperatures for an increase in thermal efficiency. With a change to a pressure gain combustion concept to increase the efficiency significantly, more challenges for the cooling of the first turbine stages must be overcome. For this purpose an array of 777 fan-shaped cooling holes on a flat plate are exposed to a series of different pulsating inflow conditions. Varying the amplitude up to 100% to the mean differential pressure, the film cooling performance is analyzed and evaluated. Adjusting the pulsating frequencies from 1 Hz–5 Hz further allows to gain a comprehensive understanding of the influence of the main parameters affecting the cooling film development. The experimental data recorded with an infrared thermography system reveals a strong impact of the pulsating inflow conditions on the adiabatic film cooling effectiveness.
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Abbreviations
- \(\eta \) :
-
Adiabatic film cooling effectiveness
- \(\rho _\infty \) :
-
Main flow air density
- \(\rho _c\) :
-
Secondary flow air density
- CRC :
-
Collaborative Research Centre
- DR :
-
Density ratio
- \(f_p\) :
-
Pulse frequency
- \(l_{ax}\) :
-
Axial position of cooling hole
- M :
-
Blowing ratio
- NGV :
-
Nozzle guide vane
- Re :
-
Reynolds number
- \(T_\infty \) :
-
Main flow air temperature
- \(T_{aw}\) :
-
Adiabatic surface temperature
- \(T_c\) :
-
Secondary flow air temperature
- \(V_\infty \) :
-
Main flow velocity
- \(V_c\) :
-
Secondary flow air density
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Acknowledgements
The authors acknowledge the support for this research by the Deutsche Forschungsgemeinschaft (DFG) in the context of the Collaborative Research Center CRC1029 ‘Substantial Efficiency Increase in Gas Turbines through Direct Use of Coupled Unsteady Combustion and Flow’ through sub-project B05.
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Heinrich, A., Herbig, M., Peitsch, D. (2022). Time-Resolved Analysis of Film Cooling Effects Under Pulsating Inflow Conditions. In: King, R., Peitsch, D. (eds) Active Flow and Combustion Control 2021. AFCC 2021. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 152 . Springer, Cham. https://doi.org/10.1007/978-3-030-90727-3_10
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