Gas Turbine Combustion Liner Effusion Cooling

The cooling system is segmented into multiple independent cooling mechanisms: convection cooling for general areas, impingement cooling for specific hot spots, and effusion cooling through distributed holes throughout the liner. This segmentation allows each cooling method to target specific regions, ensuring comprehensive coverage including obstructed areas that cannot be reached by conventional methods.

Different cooling methods are applied to different locations of the combustion liner based on local thermal conditions. Effusion holes are distributed throughout the liner including behind seals and baffle walls, while impingement cooling nozzles are positioned to target specific high-temperature zones. This localized approach ensures optimal cooling effectiveness in each region without requiring a single complex system.

The combustion liner incorporates effusion holes that create a porous structure throughout the liner material. These holes can be formed using established manufacturing techniques such as drilling, punching, or creating controlled porosity in the material during fabrication. The porous design allows cooling air to permeate through the liner walls into obstructed areas, providing reliable cooling without requiring complex internal passages or difficult-to-manufactieve features.

Instead of trying to deliver cooling air through complex internal passages to obstructed areas, the solution extracts the cooling function by creating numerous small effusion holes distributed throughout the liner. This extraction approach simplifies the manufacturing process compared to creating complex internal flow paths, while still achieving the goal of delivering cooling air to all areas including those behind seals and baffle walls.