El-Jummah, AM, Andrews, GE and Staggs, JEJ (2013) Conjugate Heat Transfer CFD Predictions of Impingement Jet Array Flat Wall Cooling Aerodynamics with Single Sided Flow Exit. In: 2013 Proceedings of the ASME Turbo Expo 2013: Turbine Technical Conference and Exposition (GT2013). ASME Turbo Expo: Turbine Technical Conference and Exposition, 03-07 Jun 2013, San Antonio, TX, USA. American Society of Mechanical Engineers ISBN 978-0-7918-5517-1
Abstract
Conjugate heat transfer CFD studies were undertaken on impingement square jet arrays with self induced crossflow in the impingement gap with a single sided exit. The aim was to understand the aerodynamic interactions that result in the deterioration of heat transfer with axial distance, whereas the addition of duct flow heat transfer would be expected to lead to an increase in heat transfer with axial distance. A square array of impingement holes was investigated for a common geometry investigated experimentally, pitch to diameter ratio X/D of 5 and impingement gap to diameter ratio Z/D of 3.3 for 11 rows of holes in the crossflow direction. A metal duct wall was used as the impingement surface with an applied heat flux of 100kW/m(2), which for a gas turbine combustor cooling application operating at steady state with a temperature difference of similar to 450K corresponds to a convective heat transfer coefficient of similar to 200 W/m(2)K. A key feature of the predicted aerodynamics was recirculation in the plane of the impingement jets normal to the cross-flow, which produced heating of the impingement jet wall. This reverse flow jet was deflected by the cross flow which had its peak velocity in the plane between the high velocity impingement jets. The cross-flow interaction with the impingement jets reduced the interaction between the jets on the surface, with lower surface turbulence as a result and this reduced the surface convective heat transfer. A significant feature of the predictions was the interaction of the cross-flow aerodynamics with the impingement jet wall and associated heat transfer to that wall. The results showed that the deterioration in heat transfer with axial distance was well predicted, together with predictions of the impingement wall surface temperature gradients.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2013 by ASME. This is an author produced version of a paper published in 2013 Proceedings of the ASME Turbo Expo 2013: Turbine Technical Conference and Exposition (GT2013). |
Keywords: | Flow (Dynamics), Aerodynamics, Heat transfer, Cooling, Computational fluid dynamics |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) > Energy Research Institute (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 10 Aug 2016 09:33 |
Last Modified: | 20 Jan 2018 17:26 |
Published Version: | https://dx.doi.org/10.1115/GT2013-95343 |
Status: | Published |
Publisher: | American Society of Mechanical Engineers |
Identification Number: | 10.1115/GT2013-95343 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:97238 |