Experimentally informed optimization of turbulent diffusivity for a discrete hole film cooling geometry
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Date
2013-12Type
- Journal Article
ETH Bibliography
no
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Abstract
A process has been developed by which mean velocity and concentration measurements can be used to determine optimal turbulent diffusivity values for an angled jet in cross-flow configuration. This configuration has applications in film cooling for gas turbine blades. The measurements, obtained by magnetic resonance imaging techniques, provide 3D time-averaged velocity and concentration fields. The mean velocity field is fed into a Reynolds-Averaged Advection Diffusion solver, which uses a turbulent diffusivity model to solve for the mean coolant concentration distribution. This distribution can be compared to the experimentally-obtained concentration field by means of an error metric that quantifies the difference between the computational and experimental concentration fields. By minimizing this error, an optimal value of the turbulent diffusivity can be determined. This optimized distribution is then compared to a RANS simulation to evaluate the relative contribution to error of the turbulent momentum flux model versus the turbulent scalar flux model. Show more
Publication status
publishedExternal links
Journal / series
International Journal of Heat and Fluid FlowVolume
Pages / Article No.
Publisher
ElsevierSubject
Turbulent diffusivity; Turbulent Prandtl number; Turbulent Schmidt number; Film cooling; AnisotropyOrganisational unit
09709 - Coletti, Filippo / Coletti, Filippo
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ETH Bibliography
no
Altmetrics