Heat Transfer In A Ribbed Square Duct
By Large-Eddy-Simulation
Author(s)
O. Labbé
Abstract
Large-eddy simulation is used to understand the flow in a square ribbed duct
representative of systems designed for internal cooling of turbine blades. The
presence of ribs increases turbulence levels and enhances heat transfer. The
objective of the present LES study is to solve three-dimensional Navier-Stokes
equations for a compressible flow to enable simulations for which the
temperature variation within the flow is very significant. This simulation allows
us to deal with a fully developed turbulent flow and heat transfer in a ribbed
channel with a high blockage ratio, whose parameters are chosen to reproduce
the experiments of Casarsa et al. \“Characterization of the velocity and heat
transfer fields in an internal cooling channel with high blockage ratio.”
Proceedings of ASME TURBO EXPO 2002 June 3-6, Amsterdam, The
Netherlands, 2002. The simulation is restricted to one pitch length and periodic
conditions are applied in the streamwise direction. Mean and turbulent quantities
are presented, together with the heat transfer.
Keywords: LES, turbulence, heat transfer, rib, compressible flow.
1 Introduction
The efficient design of the internal ducts in gas turbine blades requires a detailed
knowledge of the flow and heat phenomena occurring inside these passages. In
ducts, ribs are used to disturb the boundary layers, thereby promoting turbulence
and enhancing heat transfer. The presence of the ribs leads to a complex velocity
field with regions of flow separation upstream and downstream of the ribs and
contributes to the level of mixing of the cooler part of the air stream with the
warmer air close to the walls.
A large number of experimental investigations are available in the literature
on aerodynamics and heat transfer performance of internal cooling channels with
Keywords
LES, turbulence, heat transfer, rib, compressible flow.
Related Book
Other papers in this volume
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