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Turbulence Heat and Mass Transfer 6. Proceedings of the Sixth International Symposium On Turbulence Heat and Mass Transfer
September, 14-18, 2009, Rome, Italy

DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf


ISBN Print: 978-1-56700-262-1

ISSN: 2377-2816

Aero-thermal simulation in a square ribbed duct

page 12
DOI: 10.1615/ICHMT.2009.TurbulHeatMassTransf.820
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摘要

Ribbed internal cooling ducts in various configurations are commonly used in modern high temperature gas turbine vanes and blades to enhance the heat transfer coefficient. The flows generated by ribs are dominated by separating and reattaching shear layers with vortex shedding and secondary flows in the cross-section. High-resolution large-eddy simulation, which parameters are chosen to reproduce the experiments of Casarsa et al. 4, is used to investigate the mean and turbulence properties of a separated flow in a channel constricted periodically distributed rib turbulators on the lower wall that obstruct the duct by 30% of its height. The Reynolds number based on the channel height and the bulk velocity is 40,000. To limit computational expense, the simulation is restricted to one pitch length and periodic conditions are applied in the streamwise direction. Due to the presence of the lateral walls, the flow structure is very complex and needs an accurate mesh to capture the different recirculation zones. The assumption of a uniform heat flux thermal boundary condition is performed along the different walls, including the rib. Mean and turbulent quantities are presented, together with the heat transfer. The time-averaged results show good agreement with experimental data.

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