What is it about?
Pin-fin cooling is one of the cooling system strategy to cool down the gas turbine blades around the trailing edge region below the temperature of melting point of a metal blade for safety and durability of engine operations.
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Why is it important?
Modern gas turbines often operate at very high inlet temperatures up to 1,200 – 1,500°C. These conditions and requirements will cause serious issues for key components such as liners, vanes and blades as the engine operation temperature is far beyond their critical working temperature. Furthermore, higher turbine inlet temperatures could lead to other adverse effects such as simply melting, oxidation, corrosion, erosion and degradation of structural strength. An extremely high convective heat flux around a blade trailing-edge causes cracks, thermal-fatigue, and buckling thus risking turbine blade failure.
Perspectives
In order to overcome these problems, turbine blades need to be cooled down by keeping the surfaces temperature below the melting point of a metal blade for safety and durability of engine operations. The trailing-edge is one of the key areas that have been addressed by designers not only because of the high local thermal loading, but also due to the very thin blade trailing-edge geometry necessary to meet the aerodynamic performance requirements.
Dr Marwan Effendy
Universitas Muhammadiyah Surakarta
Read the Original
This page is a summary of: Numerical study of pin-fin cooling on gas turbine blades, January 2019, American Institute of Physics,
DOI: 10.1063/1.5112493.
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