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Directional Effects of Effusion Cooling on the Cooling Film Effectiveness
AIAA Journal, 2021Effusion cooling in gas turbine combustors is complicated by swirling flows for anchoring flame, whereas miniature effusion cooling jets are highly directional.
Leo C. Paitich +5 more
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Effusion Cooling: Influence of Pressure Drop
Volume 6A: Heat Transfer — Combustors; Film Cooling, 2022Abstract Combustor liners are exposed to significant thermal gradients with hot combustion gases on one side and compressor directed cooling air on the other side. To maintain effective life of the liners, development of effective methods to cool gas turbine combustor liners are a necessity.
Michael Bonds +5 more
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Correlative Analysis of Effusion Cooling Systems
Journal of Turbomachinery, 2008Gas turbine cooling has steadily acquired major importance whenever engine performances have to be improved. Among various cooling techniques, film cooling is probably one of the most diffused systems for protecting metal surfaces against hot gases in turbine stages and combustor liners. Most recent developments in hole manufacturing allow to perform a
L. ARCANGELI +3 more
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Correlative Analysis of Effusion Cooling Systems
Volume 3: Heat Transfer, Parts A and B, 2006Gas turbine cooling has steadily acquired major importance whenever engine performances have to be improved. Among various cooling techniques, film cooling is probably one of the most diffused systems for protecting metal surfaces against hot gases in turbine stages and combustor liners. Most recent developments in hole manufacturing allow to perform a
Lorenzo Arcangeli +4 more
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Advances in effusive cooling techniques of gas turbines
Applied Thermal Engineering, 2007Abstract Gas turbine combustion chambers and turbine blades require better cooling techniques to cope with the increase in operating temperatures with each new engine model. Current gas turbine inlet temperatures are approaching 2000 K. Transpiration-cooled components have proved an effective way to achieve high temperatures and erosion resistance ...
Battisti, Lorenzo +3 more
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The Mechanism and Application of Effusion Cooling
The Journal of the Royal Aeronautical Society, 1959In his excellent review of the “state of the art” of effusion cooling (p. 73, February Journal, 1959), Dr. P. Grootenhuis clearly distinguishes the two mechanisms which contribute to the cooling effectiveness; namely, efficient abstraction of heat from the porous wall material by internal transfer to the effusing coolant, and reduction of the rate of ...
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Cooling Efficiency for Assessing the Cooling Performance of an Effusion Cooled Combustor Liner
Volume 3B: Heat Transfer, 2013Based on experimental results on a liner of a modern direct lean injection combustion chamber using coolant ejection from both effusion cooling holes and a starter film, a method is presented that allows the assessment of the cooling performance of the liner.
Wurm, B. +3 more
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Volume 3B: Heat Transfer, 2013
Full coverage effusion cooling was studied for a square array of 90° effusion cooling holes with backside cooling using a 5 mm depth duct air supply to the coolant holes, with the duct air mass flow rate being greater than the effusion cooling flow. This geometry represents combustor primary zone wall cooling with the dilution air or main combustion ...
G. E. Andrews, I. M. Khalifa
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Full coverage effusion cooling was studied for a square array of 90° effusion cooling holes with backside cooling using a 5 mm depth duct air supply to the coolant holes, with the duct air mass flow rate being greater than the effusion cooling flow. This geometry represents combustor primary zone wall cooling with the dilution air or main combustion ...
G. E. Andrews, I. M. Khalifa
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Effusion Cooling: The Influence of the Number of Holes
Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 1990Experimental measurements of the overall cooling effectiveness for full-coverage discrete hole effusion cooling are presented for a wide range of practical geometries and for a density ratio between the coolant and combustion gases of 2.5. The influence of the number of holes per unit surface area was investigated at two fixed total hole areas or ...
G E Andrews +3 more
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Investigation for the Improvement of Film Cooling Effectiveness of Effusion Cooling Holes
2020The operating gas temperatures of advanced military aero engines are continuously increasing to achieve a higher specific thrust. The gas temperature exposed by hot end components is beyond material allowable temperature limits. It is essential to cool these components to lower the metal temperatures to meet the designed life.
Batchu Suresh +3 more
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