Title: Influence of film cooling jet inlet boundary condition on large eddy simulation of model turbine blade leading edge

Authors: Farzad Bazdidi-Tehrani; Nima Bohlooli; Mohammad Jadidi

Addresses: School of Mechanical Engineering, Iran University of Science and Technology, Tehran 16846-13114, Iran ' School of Mechanical Engineering, Iran University of Science and Technology, Tehran 16846-13114, Iran ' School of Mechanical Engineering, Iran University of Science and Technology, Tehran 16846-13114, Iran

Abstract: The present paper investigates the influence of film cooling jet inlet boundary condition (IBC) on the large eddy simulation (LES) of film cooling in a model turbine blade with a curved leading edge. Four different IBCs comprising: 1) uniform flow; 2) time independent fully developed turbulent flow and time dependent fully developed turbulent flow perturbed by the vortex method applying two turbulence intensities of 2% and 7% are employed. Results show that accuracy of LES predictions is greatly reliant on coolant jet IBC and case (4) illustrates the best agreement with experiment whilst other cases over-predict the adiabatic effectiveness. Also, film cooling jet IBC not only has a significant influence on flow field vortical structures, but also influences the entrainment and mixing of cold and hot flows. Additionally, the capability of the vortex method for producing a time dependent IBC in leading edge film cooling application is examined and confirmed.

Keywords: large eddy simulation; LES; film cooling; blade leading edge; vortex method; inlet boundary condition; adiabatic effectiveness; jet inlet; modelling; turbine blades; uniform flow; turbulent flow; flow entrainment; flow mixing.

DOI: 10.1504/PCFD.2015.070439

Progress in Computational Fluid Dynamics, An International Journal, 2015 Vol.15 No.4, pp.214 - 227

Received: 08 May 2021
Accepted: 12 May 2021

Published online: 06 Jul 2015 *

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