Journal
THERMOPHYSICS AND AEROMECHANICS
Volume 22, Issue 3, Pages 329-338Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S0869864315030075
Keywords
film cooling; thermal effectiveness; gas screen; blowing through holes; trench; numerical calculations
Funding
- Russian Foundation for Basic Research [14-08-90405 Ukr_a]
- Program for raising the Tomsk State University competitive recovery among the leading world scientific and educational centers
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Results of a numerical study of the thermal effectiveness of a gas wall screen implemented via gas blowing through cylindrical inclined holes embedded in a transverse trench are reported. The calculations were performed using 3D Reynolds-averaged Navier-Stokes equations, with the flow turbulence being modeled by means of the Reynolds-stress model. Blowing into the trench was compared to the conventional cooling technique using gas blowing without a trench. The film cooling effectiveness with gas injection through circular holes embedded in trench exceeds significantly the effectiveness of blowing without a trench. Such a method of coolant supply into the flow proved to be especially advantageous at high blowing ratios. Due to the formation of vortical structures inside the trench, a more uniform cooling flow in the spanwise direction can be achieved. A comparative analysis is indicative of acceptable qualitative agreement of the experimental and predicted data.
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