Title

Comparision Of Film Effectiveness And Cooling Uniformity Of Conical And Cylindrical-Shaped Film Hole With Coolant-Exit Temperature Correction

Keywords

Computational fluid dynamic; Conical-shaped hole; Cooling uniformity coefficient; Discharge coefficient; Film cooling; Reynolds Averaged Navier Stokes

Abstract

Data from conical-shaped film cooling holes is extremely sparse in open literature, especially the cooling uniformity characteristic, an important criterion for evaluating any film cooling design. The authors will compare the performance of conical-shaped holes to cylindrical-shaped holes. Cylindrical-shaped holes are often considered a baseline in terms of film cooling effectiveness and cooling uniformity coefficient. The authors will study two coupons with conical-shaped holes, which have 3° and 6° diffusion angles, named CON3 and CON6 respectively. A conjugate heat transfer computational fluid dynamics model and an experimental wind tunnel will be used to study these coupons. The three configurations: cylindrical baseline, CON3, and CON6, have a single row of holes with an inlet metering diameter of 3mm, length-to-nominal diameter of 4.3, and an injection angle of 30°. In this study, the authors will also take into account the heat transfer into the coolant flow from the coolant channel. In other words, coolant temperature at the exit of the coolant hole will be different than that measured at the inlet, and the conjugate heat transfer model will be used to correct for this difference. For the numerical model, the realizable k-ε turbulent model will be applied with a second order of discretization and enhanced wall treatment to provide the highest accuracy available. Grid independent studies for both cylindrical-shaped film cooling holes and conical-shaped holes will be performed and the results will be compared to data in open literature as well as in-house experimental data. Results show that conical-shaped holes considerably outperform cylindrical-shaped holes in film cooling effectiveness at all blowing ratios. In terms of cooling uniformity, conical-shaped holes perform better than cylindrical-shaped holes for low and mid-range blowing ratios, but not at higher levels. Copyright © 2010 by ASME.

Publication Date

12-1-2010

Publication Title

Proceedings of the ASME Turbo Expo

Volume

4

Issue

PARTS A AND B

Number of Pages

1897-1907

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1115/GT2010-23732

Socpus ID

82055175515 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/82055175515

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