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On the Effect of Geometry of W-wave Trenches on Film Cooling Performance of Gas Turbine Blades by Alireza Bakhshinejad Bahambari; Mohammad Hassan Kayhani; Mahmood Norouzi is a Engineering article available to read on EtoBox.

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In the present study, three types of w-wave trenches with different amplitude configurations are compared with transverse trench (TT), and the use of variable radius fillet (VRF) on downstream lips at different blowing ratio is numerically investigated to measure heat transfer coefficient, and cooling effectiveness. The numerical results are obtained by threedimensional Reynolds average Navier-Stokes equations (RANS) while employing shear stress transport turbulence models, which are validated by comparing with experimental data. The trench width is kept constant in all cases, yet the three different amplitudes and variable fillet radiuses offered a variety of designs in trench film cooling. The results showed that w-wave trenches impressively improved film cooling effectiveness over the transverse trench, and utilizing fillets at downstream lips of the trench caused significant enhancement on both lateral averaged and centerline cooling performance. Due to the w-wave trench configuration, anti-counter-rotating vortices responsible for pushing coolant film toward the near-wall were formed throughout of downstream wall of the trench, and the cooling flow thus had a more uniform stru

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Author

Alireza Bakhshinejad Bahambari; Mohammad Hassan Kayhani; Mahmood Norouzi

Publisher

SAGE Publications

Published

2021

Language

EN

Field

Engineering (Physical Sciences)