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research-article

Impact Of Wall Temperature On Heat Transfer Coefficient And Aerodynamics For 3-D Turbine Blade Passage

[+] Author and Article Information
Roberto Maffulli

Von Karman Institute for Fluid Dynamics, Chaussée de Waterloo 72, 1640 Rhode St Genese, Belgium
maffulli@vki.ac.be

Li He

Osney Thermofluids Laboratory Department of Engineering Science University of Oxford, Osney Mead, Oxford OX2 0ES, UK
li.he@eng.ox.ac.uk

1Corresponding author.

ASME doi:10.1115/1.4036012 History: Received March 21, 2016; Revised February 05, 2017

Abstract

The present work is aimed to examine how the HTC and main 3D passage aerodynamic features may be affected by a non-adiabatic wall temperature condition. A systematic computational study has been firstly carried out for a 3D NGV passage. The impacts of wall temperature on the secondary flows, trailing edge shock waves and the passage flow capacity are discussed, underlining the connection and interactions between the wall temperature and the external aerodynamics of the 3D passage. The local errors in HTC in these 3D flow regions can be as high as 30-40\% if the wall temperature dependence is not corrected. The effort is then directed to a new 3-point non-linear correction method. The benefit of the 3-point method in reducing errors in HTC is clearly demonstrated. A further study illustrates that the new method also offers much enhanced robustness in the wall heat flux scaling, particularly relevant when the wall thermal condition is also shown to influence the laminar-turbulent transition exhibited by two well-established transition models adopted in the present work.

Copyright (c) 2017 by ASME
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