Adaptation of k-ε turbulence model for the flat plate film cooling numerical simulations downstream two rows of holes arranged in spherical dimples
DOI:
https://doi.org/10.15587/1729-4061.2013.14867Keywords:
film cooling, the adiabatic effectiveness, spherical dimples, numerical simulation, k-ε turbulence modelAbstract
This paper presents results of numerical simulation development for flat plate film cooling with coolant injection through two rows of cylindrical holes arranged in spherical dimples. The previous experience has shown that application of standard turbulence models lead to significant difference between numerical simulation results and experimental data. The numerical simulation development lay in providing of correspondence between calculated and experimental film cooling efficiency values and was carried out with the use of commercial software package ANSYS CFX 14 in two stages. At first stage test calculations were performed for turbulence model second stage the adaptation of selected k-ε turbulence model was performed with variation of modeling constant Cε1 within 0.8- 1.8 limits.
Calculations showed that best agreement with experiment at blowing ratio m = 0.5 was provided with a standard constant value Cε1=1,44; at m = 1,0 it is reasonable to use value Cε1=1,2; at m=1,5 and 2,0 according to film cooling effectiveness downstream first and second rows best agreement is provided at Cε1=1,0. In calculations with recommended Cε1 values maximum discrepancy with experiment does not exceed 15 %.
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Copyright (c) 2014 Артем Артемович Халатов, Мария Владимировна Безлюдная, Юрий Яковлевич Дашевский, Сергей Дмитриевич Северин, Игорь Иванович Борисов
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