What is it about?
The distributions of adiabatic film-cooling effectiveness along the cutback walls were found to be sensitive to the coolant ejection slot angle. Film-cooling performance is dependent on blowing ratio, lip-to-slot height ratio, ejection slot angle. Coolant ejection slot angle influences overall performance of gas turbine blade.
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Why is it important?
One of the main driving forces behind gas turbine design and development is to achieve the highest possible overall engine performance in terms of power output and thermal efficiency. Due to this reason, 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
turbine blades need to be cooled down by keeping the surface temperature below the melting point of a metal blade for safety and durability of engine operations.
Dr Marwan Effendy
Universitas Muhammadiyah Surakarta
Read the Original
This page is a summary of: Detached eddy simulation of blade trailing-edge cutback cooling performance at various ejection slot angles, International Journal of Heat and Fluid Flow, December 2019, Elsevier,
DOI: 10.1016/j.ijheatfluidflow.2019.108487.
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