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Investigation of the Film-Cooling Performance of 2.5D Braided Ceramic Matrix Composite Plates with Preformed Hole
Open AccessArticle

Effect of Two-Head Flared Hole on Film Cooling Performance over a Flat Plate

1
Department of Aerospace Engineering, Hanoi University of Science and Technology, No. 1, Dai Co Viet Road, Hai Ba Trung District, Hanoi 100000, Vietnam
2
Viettel Aerospace Institute, Viettel Building—Hoa Lac Hi-Tech Park, Thach That, Hanoi 100000, Vietnam
*
Author to whom correspondence should be addressed.
Academic Editor: Hao Xia
Aerospace 2021, 8(5), 128; https://doi.org/10.3390/aerospace8050128
Received: 26 March 2021 / Revised: 19 April 2021 / Accepted: 21 April 2021 / Published: 4 May 2021
(This article belongs to the Special Issue Advances in Aerothermal Engineering)
Film cooling is commonly utilized in turbine blades to decrease the temperature of the air stream from the combustion chamber that contacts directly with the blades. The shape of a cylindrical hole (CH) with the geometrical variations at inlet and outlet ports was examined using the 3D Reynolds-averaged Navier–Stokes equations (RANS) with a shear stress transport (SST k − ω) turbulence model to study the effect of the two-head flared hole on film cooling effectiveness (FE) at high accuracy with a small y+ value. To assess the effect of the changes, each geometry of the hole was changed one after another while the other parameters were kept invariable at the test value (cylindrical hole). The numerical laterally averaged film cooling effectiveness (ηl) of the CH case was validated and compared to the experimental data. The simulation results with the two-head flared hole indicated that most of these shape changes increase the FE as compared to the CH case. In particular, the maximum spatially averaged film cooling effectiveness (ηs) with hole shape expanded along the flow direction at the outlet port reached 60.787% in comparison to the CH case. View Full-Text
Keywords: two-head flared hole; film cooling effectiveness; Reynolds-averaged Navier–Stokes analysis two-head flared hole; film cooling effectiveness; Reynolds-averaged Navier–Stokes analysis
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MDPI and ACS Style

Le, X.-T.; Nguyen, D.-A.; Dinh, C.-T.; Nguyen, Q.-H. Effect of Two-Head Flared Hole on Film Cooling Performance over a Flat Plate. Aerospace 2021, 8, 128. https://doi.org/10.3390/aerospace8050128

AMA Style

Le X-T, Nguyen D-A, Dinh C-T, Nguyen Q-H. Effect of Two-Head Flared Hole on Film Cooling Performance over a Flat Plate. Aerospace. 2021; 8(5):128. https://doi.org/10.3390/aerospace8050128

Chicago/Turabian Style

Le, Xuan-Truong; Nguyen, Duc-Anh; Dinh, Cong-Truong; Nguyen, Quang-Hai. 2021. "Effect of Two-Head Flared Hole on Film Cooling Performance over a Flat Plate" Aerospace 8, no. 5: 128. https://doi.org/10.3390/aerospace8050128

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