Session: 12-10: Film Cooling Computational Studies (III)

Paper Number: 154111

Investigation of a Dynamic Hybrid Turbulence Modeling Strategy for CFD Simulation of Compound-Angle Film Cooling 

Computational prediction of the complex flow physics associated with component film cooling is important for ensuring accurate and efficient heat transfer design. Since these flow fields are naturally turbulent, accurate yet cost-effective turbulence modeling techniques are a critical aspect of computational fluid dynamics (CFD) based analysis. A previous study the authors was conducted that investigated the capabilities of the dynamic hybrid RANS-LES (DHRL) turbulence modeling framework compared to an industry standard RANS k-w SST model (Simmonds et al. 2023 IMECE). The previous study validated the DHRL model for a simple square normal jet in crossflow geometry, with a density ratio of 1, by comparing the DHRL model results to experimental results with equivalent dimensionless parameters. In the present study, more engine representative film-cooling experimental results with complex geometry and realistic dimensionless parameters are investigated in order to further validate the DHRL model. The geometry includes a streamwise and compound angled round coolant film hole, as opposed to the normal injection of a square jet previously investigated. A wider range of blowing ratios is also investigated. The density ratio between the coolant and crossflow is 1.5, with the crossflow air at 305 K and the pure nitrogen coolant stream at 203 K. Three different coolant injection modes are investigated for all blowing ratios, including internal channel flow injection with counter and inline channel flow directions, as well as plenum fed injection. The DHRL results are compared to industry standard RANS k-w SST model results and to the experimental data, in terms of . spatially and laterally averaged adiabatic effectiveness, in order to quantify the accuracy of each modeling methodology.

Presenting Author: Cole Simmonds University of Arkansas

Presenting Author Biography: Cole Simmonds is a graduate student at the University of Arkansas pursuing an MS degree under the direction of Dr. D. Keith Walters.

Authors:

Cole Simmonds University of Arkansas
D. Keith Walters University of Arkansas
James Leylek University of Arkansas