Film cooling behind two rows of trenches on a flat surface
A.A. Khalatov1,2,3, E Shi-Ju2, Dongyun Wang2, T.V. Donyk1,3
1Institute of Engineering Thermophysics NAS of Ukraine, Kiev, Ukraine
2Zhejiang Normal University, Jinhua, China
3National Technical University of Ukraine, Igor Sikorsky Kyiv Polytechnic Institute, Kiev, Ukraine
Keywords: trench, two rows of holes, efficiency of film cooling, computer simulation
Abstract
The paper presents the results of computer simulation of film cooling behind two rows of trenches on an adiabatic surface with coolant supply through inclined round holes located in the trench. The calculations were carried out in the range of injection parameter from 0.4 to 2.2 using the commercial computer package ANSYS CFX 14 and the SST turbulence model. It was found that for the injection parameter m > 0.6, asymmetry of the film cooling efficiency is observed behind the second trench, which increases with a growth in the injection parameter. This is explained by the unsteady nature of interaction of the cooling jets from the holes of the first and second rows. In the area between the first and second rows of trenches near the end “strips” the film cooling efficiency is 5-10% higher than near the middle ones, however behind the second trench it is 8-20% lower, which is caused by the staggered arrangement of the injection holes. For all injection parameters, the globally-averaged film cooling effectiveness near the end “strips” of the adiabatic surface is lower than that near the middle ones.
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