Impinging jet arrays are typically used to cool several gas turbine parts. Some examples of such applications can be found in the internal cooling of high-pressure turbine airfoils or in the turbine blade tip clearances control of aero-engines. The effect of the wall-to-jets temperature ratio (TR) on heat transfer is generally neglected by the correlations available in the open literature. In the present contribution, the impact of the temperature ratio on the heat transfer for a real engine active clearance control system is analyzed by means of validated computational fluid dynamics (CFD) computations. At different jets Reynolds number and considering several impingement array arrangements, a wide range of target wall-to-jets temperature ratio is accounted for. Computational results prove that both local and averaged Nusselt numbers reduce with increasing. An in-depth analysis of the numerical data shows that the last mentioned evidence is motivated by both the heat transfer incurring between the spent coolant flow and the fresh jets and the variation of gas properties with temperature through the boundary layer. A scaling procedure, based on the TR power law, was proposed to estimate the Nusselt number at different wall temperature levels necessary to correct available open-literature correlations, typically developed with small temperature differences, for real engine applications.
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August 2019
Research-Article
Effect of Temperature Ratio on Jet Impingement Heat Transfer in Active Clearance Control Systems
Riccardo Da Soghe,
Riccardo Da Soghe
1
1Corresponding author.
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Lorenzo Tarchi
Lorenzo Tarchi
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Riccardo Da Soghe
Cosimo Bianchini
Jacopo D’Errico
Lorenzo Tarchi
1Corresponding author.
Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the Journal of Turbomachinery. Manuscript received October 11, 2018; final manuscript received March 14, 2019; published online March 29, 2019. Assoc. Editor: Kenneth Hall.
J. Turbomach. Aug 2019, 141(8): 081009 (8 pages)
Published Online: March 29, 2019
Article history
Received:
October 11, 2018
Revision Received:
March 14, 2019
Accepted:
March 14, 2019
Citation
Da Soghe, R., Bianchini, C., D’Errico, J., and Tarchi, L. (March 29, 2019). "Effect of Temperature Ratio on Jet Impingement Heat Transfer in Active Clearance Control Systems." ASME. J. Turbomach. August 2019; 141(8): 081009. https://doi.org/10.1115/1.4043217
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