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FLOW AND HEAT-TRANSFER MODELLING OF THREE-DIMENSIONAL JET IMPINGEMENT ON A CONCAVE SURFACE

Timothy J. Craft
Turbulence Mechanics Group, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, PO Box 88, Manchester M13 9PL, UK

Hector Iacovides
Turbulence Mechanics Group, School of Mechanical, Aerospace and Civil Engineering. The University of Manchester, Manchester M13 9PL, U.K.

Nor A. Mostafa
School of Mechanical, Aerospace & Civil Engineering, The University of Manchester, Manchester M60 1QD, UK

Аннотация

The paper reports computations of the flow and heat-transfer from a round jet impinging onto a concave semi-circular surface, designed to reproduce important flow features found in internal turbine blade cooling applications. Linear and non-linear eddy-viscosity models are applied, with wall-functions to cover the near-wall layer, and are shown to capture the overall flow characteristics. The standard, log-law based, form of wall-function is found to be inadequate in predicting the heat-transfer, and a more advanced form developed at Manchester (the AWF) is also tested. The exact way in which convective terms are approximated in this latter approach is shown to be crucial, and a form is presented which leads to stable and reasonably accurate solutions.