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Computational modelling of the flow and heat transfer in dimpled channels

Part of: ISABE 2017

Published online by Cambridge University Press:  17 July 2017

K. Abo Amsha ,
T.J. Craft  and
H. Iacovides
K. Abo Amsha*
Affiliation:
Turbulence Mechanics Group, School of MACE, The University of Manchester, Manchester, UK
T.J. Craft
Affiliation:
Turbulence Mechanics Group, School of MACE, The University of Manchester, Manchester, UK
H. Iacovides
Affiliation:
Turbulence Mechanics Group, School of MACE, The University of Manchester, Manchester, UK
*
khalil.aboamsha@manchester.ac.uk
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Abstract

The flow and heat transfer characteristics over a single dimple and an array of staggered dimples have been investigated using the Reynolds Averaged Navier-Stokes (RANS) approach. The objective is to determine how reliably RANS models can predict this type of complex cooling flows. Three classes of low-Reynolds number RANS models have been employed to represent the turbulence. These included a linear Eddy Viscosity Model (EVM), a Non-Linear Model (NLEVM) and a Reynolds Stress transport Model (RSM). Variants of the k-ε model have been used to represent the first two categories. Steady and time-dependent simulations have been carried out at a bulk Reynolds number of around 5,000 with dimple print diameter to channel height ratios of D/H = 1.0, 2.0 and ratios of dimple depth to channel height of δ/H = 0.2, 0.4. The linear EVM and the RSM tested both produce symmetric circulations in the dimples, while the NLEVM produces an asymmetric pattern. The mean velocity profiles predicted numerically are generally in good agreement with the data. The main flow characteristics are reproduced by the RANS models, but some predictive deviations from available data point to the need for further investigations. All models report an overall enhancement in heat transfer levels when using dimples in comparison to those of a plane channel.

Keywords

Turbine blade coolingdimplesturbulence modellingRANS
Type
Research Article
Information
The Aeronautical Journal , Volume 121 , Special Issue 1242: The International Society of Air-breathing Engines (ISABE) 2017 Conference Special Issue , August 2017 , pp. 1066 - 1086
Copyright
Copyright © Royal Aeronautical Society 2017 

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Footnotes

This paper will be presented at the ISABE 2017 Conference, 3-8 September 2017, Manchester, UK.

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