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Experimental investigation of the influence of film cooling hole diameter on the total cooling effectiveness for cyclone-cooled turbine blades

Bicat, Dogan 1; Stichling, Katharina 1; Elfner, Maximilian; Bauer, Hans-Jörg 1; Lehmann, Knut
1 Institut für Thermische Strömungsmaschinen (ITS), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

Cyclone cooling is a promising method for a more effective internal cooling of turbine rotor blades with simplified internal channels including a swirling flow to enhance internal heat transfer. Previous studies have led to the conclusion that improving the cooling performance requires an adapted film cooling design, tailored to the cyclone cooling application. In this paper, a turbine rotor blade with realistic, complex features including the cyclone cooling design is investigated experimentally using infrared thermography to capture surface temperature. The objective is to analyze the influence of increased film cooling hole diameter on a cyclone-cooled blade's surface temperature. For this purpose, the diameter of the holes at the blade’s leading edge, which are fed by the cyclone channel, is increased. The tests are performed for different coolant mass flow rates and swirl numbers. Additionally, CFD simulations are performed to analyze the aerodynamics of the cooling air. The test results show that the surface temperature at the leading edge can be decreased by increasing the diameter of the film cooling holes, however, adversely affecting the remaining blade surface. ... mehr


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Originalveröffentlichung
DOI: 10.33737/gpps22-tc-32
Zugehörige Institution(en) am KIT Institut für Thermische Strömungsmaschinen (ITS)
Publikationstyp Proceedingsbeitrag
Publikationsdatum 14.09.2022
Sprache Englisch
Identifikator ISSN: 2504-4400
KITopen-ID: 1000151849
Erschienen in Proceedings of Global Power and Propulsion Society (GPPS Chania22), 12th–14th September, 2022
Veranstaltung Global Power & Propulsion Forum : European Technical Conference (GPPS-TC 2022), Chania, Griechenland, 12.09.2022 – 14.09.2022
Verlag Global Power and Propulsion Society (GPPS)
Serie Proceedings of Global Power and Propulsion Society
Schlagwörter turbine blade cooling, cyclone cooling, swirl cooling, vortex cooling, internal cooling, film cooling, infrared thermography
Nachgewiesen in Dimensions
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