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Investigation on film cooling performance from a row of round-to-slot holes on flat plate

A series of numerical computations are conducted to investigate the film cooling from a row of round-to-slot holes on a flat surface. Particular attention is paid to explore effect of slot width (0.2 ≤ s/d ≤ 0.5) on the film cooling performances of round-to-slot holes with a fixed slot length of l/d... Full description

Contained in: International Journal of Thermal Sciences Vol. 118 (2017), p. 207-225
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Links: Additional Link (dx.doi.org)
Additional Keywords: DURCHFLUSSZAHL
EXPERIMENTALANALYSE
FILMKUEHLUNG
KONVEKTIONSWAERME
KONVEKTIVER-WAERMEUEBERGANG
KUEHLMITTEL
KUEHLMITTELFLUSS
PLANFLAECHE
VERSCHAEUMUNGSGRAD
WAERMEUEBERGANGSZAHL
DOI: 10.1016/j.ijthermalsci.2017.04.029
Notes: Copyright: Metadaten: TEMA, Copyright WTI-Frankfurt eG
Copyright: (C) Alle Rechte beim Herausgeber
Physical Description: 19 Seiten, 39 Quellen
ID (e.g. DOI, URN): 10.1016/j.ijthermalsci.2017.04.029
PPN (Catalogue-ID): WTI005009316
Note: WTI TEMA DB
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520 |a A series of numerical computations are conducted to investigate the film cooling from a row of round-to-slot holes on a flat surface. Particular attention is paid to explore effect of slot width (0.2 ≤ s/d ≤ 0.5) on the film cooling performances of round-to-slot holes with a fixed slot length of l/d=2.0 under typical blowing ratios ranged from 1.0 to 2.0. Besides, several experimental tests are also performed to obtain the film cooling effectiveness and discharge coefficient of the round-to-slot holes with specific geometries. The results show that the coolant flow turning towards both lateral sides due to the transitional flow passage of film-hole is dominated inside the round-to-slot hole. Owing to the specific interaction mechanism between the coolant jet issued from round-to-slot holes and the primary flow, the hot primary flow is mainly entrained into the coolant layer from the film-hole centerline. In general, the diffusing round-to-slot hole shows its favorable feature on the film cooling enhancement near the film hole. However, beyond a certain distance, the converging round-to-slot hole achieves a little higher laterally-averaged film cooling effectiveness than the diffusing round-to-slot hole. The converging round-to-slot hole with s/d=0.2 produces higher laterally-averaged heat transfer coefficient than the cylindrical hole. While the diffusing round-to-slot hole produces less laterally-averaged convective heat transfer coefficient than the cylindrical hole beyond x/d=10. The discharge coefficient decreases significantly as the slot width reduces. [Copyright Elsevier B.V. Reproduced with permission.] 
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