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Numerical Investigation of Conjugate Heat Transfer in an Effusion and Impingement Cooled Combustor Wall

Jackowski, Thomas; Elfner, Maximilian; Bauer, Hans-Jörg

Abstract (englisch):
In this paper, a numerical investigation of conjugate heat transfer in a double-wall combustor will be presented. The model replicates the cooling air duct, the double wall with impingement and effusion cooling, as well as the hot gas duct. For simplification, the walls are modeled planar, and the test parameters were adapted from an upcoming experiment at the Institute of Thermal Turbomachinery, Karlsruhe Institute of Technology. The geometry was scaled up by a factor of 8 through performing a similarity analysis. Aerodynamic and thermal boundary conditions were scaled to ambient pressure and low temperatures while maintaining dimensionless quantities from realistic operating conditions. The diameter of the cylindrical impingement cooling holes is D = 4mm. The effusion cooling holes are angled with α = 30° to the surface and have a cylindrical entrance diameter of E=2–√D

⁠. The outlet of the effusion cooling hole is fanshaped with an opening of 7° to each side as well as laidback by 7°. Both walls have a staggered pattern in which the rows of holes are repeated every 4th row.

A range of blowing ratios from Meff = 0.5 to 3.0 was set as operating conditions for the calculations. ... mehr

DOI: 10.1115/GT2020-15505
Zugehörige Institution(en) am KIT Institut für Thermische Strömungsmaschinen (ITS)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2021
Sprache Englisch
Identifikator ISBN: 978-0-7918-8416-4
KITopen-ID: 1000128823
Erschienen in ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition, Virtual, September 21–25, 2020. Volume 7A: Heat Transfer
Veranstaltung ASME Turbo Expo: Turbomachinery Technical Conference and Exposition (2020), Online, 21.09.2020 – 25.09.2020
Verlag American Society of Mechanical Engineers (ASME)
Seiten GT2020-15505
Bemerkung zur Veröffentlichung V07AT11A009
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