Conjugate heat transfer CFD studies were undertaken on the influence of the number of impingement holes/unit surface area or hole density n (m−2) for n from 1076 to 26910m−2 at a constant X/D of 4.7, with n varied by varying the hole diameter D from 1.31 to 6.54mm and pitch X varied from 6.1mm to 30.5mm. Square array impingement cooling geometries for the jet holes were used with a 152.4 × 152.4mm experimental wall area. The impingement gap had a single sided exit which generated a cross-flow in the gap. The number of impingement holes N in the cross-flow direction was 5, 10, 15 and 25. A coolant mass flux G of 1.93kg/sm2bar was investigated at a constant impingement gap Z of 10mm (Z/D 1.53–7.65 as n was varied). This high coolant mass flow simulated the coolant flow for regeneratively cooled combustors using all the combustor air flow to cool the combustor wall prior to entering the low NOx flame stabiliser. The predictions were compared with experimental results for the heat transfer coefficient h, that used the lumped capacitance method. The predictions of the surface averaged h and pressure loss ΔP/P were in good agreement with the measured results. The predictions showed that increasing the number of impingement jet holes resulted in lower h, due to the impact of cross-flow for large numbers of holes. At the other extreme, a very small number of holes were predicted to have high thermal gradients. The maximum heat transfer was found experimentally and computationally to be 4306 holes per m2 for an X/D of 4.7, with acceptable thermal gradients.
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ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
June 16–20, 2014
Düsseldorf, Germany
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4571-4
PROCEEDINGS PAPER
Conjugate Heat Transfer CFD Predictions of Impingement Heat Transfer: Influence of the Number of Holes for a Constant Pitch-to-Diameter Ratio X/D
Abubakar M. El-Jummah,
Abubakar M. El-Jummah
University of Leeds, Leeds, UK
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Reyad A. A. Abdul Hussain,
Reyad A. A. Abdul Hussain
University of Leeds, Leeds, UK
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Gordon E. Andrews,
Gordon E. Andrews
University of Leeds, Leeds, UK
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John E. J. Staggs
John E. J. Staggs
University of Leeds, Leeds, UK
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Abubakar M. El-Jummah
University of Leeds, Leeds, UK
Reyad A. A. Abdul Hussain
University of Leeds, Leeds, UK
Gordon E. Andrews
University of Leeds, Leeds, UK
John E. J. Staggs
University of Leeds, Leeds, UK
Paper No:
GT2014-25268, V05AT11A004; 14 pages
Published Online:
September 18, 2014
Citation
El-Jummah, AM, Abdul Hussain, RAA, Andrews, GE, & Staggs, JEJ. "Conjugate Heat Transfer CFD Predictions of Impingement Heat Transfer: Influence of the Number of Holes for a Constant Pitch-to-Diameter Ratio X/D." Proceedings of the ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. Volume 5A: Heat Transfer. Düsseldorf, Germany. June 16–20, 2014. V05AT11A004. ASME. https://doi.org/10.1115/GT2014-25268
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