Unsteady Flow Field Characterization of Effusion Cooling Systems with Swirling Main Flow: Comparison Between Cylindrical and Shaped Holes

Tommaso Lenzi, Alessio Picchi, Tommaso Bacci, Antonio Andreini and Bruno Facchini
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Tommaso Lenzi: DIEF-Department of Industrial Engineering of Florence, University of Florence, via S. Marta 3, 50139 Florence, Italy
Alessio Picchi: DIEF-Department of Industrial Engineering of Florence, University of Florence, via S. Marta 3, 50139 Florence, Italy
Tommaso Bacci: DIEF-Department of Industrial Engineering of Florence, University of Florence, via S. Marta 3, 50139 Florence, Italy
Antonio Andreini: DIEF-Department of Industrial Engineering of Florence, University of Florence, via S. Marta 3, 50139 Florence, Italy
Bruno Facchini: DIEF-Department of Industrial Engineering of Florence, University of Florence, via S. Marta 3, 50139 Florence, Italy

Energies, 2020, vol. 13, issue 19, 1-15

Abstract: The presence of injectors with strongly swirled flows, used to promote flame stability in the combustion chambers of gas turbines, influences the behaviour of the effusion cooling jets and consequently of the liner’s cooling capabilities. For this reason, unsteady behaviour of the jets in the presence of swirling flow requires a characterization by means of experimental flow field analyses. The experimental setup of this work consists of a non-reactive single-sector linear combustor test rig, scaled up with respect to the real engine geometry to increase spatial resolution and to reduce the frequencies of the unsteadiness. It is equipped with a radial swirler and multi-perforated effusion plates to simulate the liner cooling system. Two effusion plates were tested and compared: with cylindrical and with laid-back fan-shaped 7-7-7 holes in staggered arrangement. Time resolved Particle Image Velocimetry has been carried out: the unsteady characteristics of the jets, promoted by the intermittent interactions with the turbulent mainstream, have been investigated as their vortex structures and turbulent decay. The results demonstrate how an unsteady analysis is necessary to provide a complete characterization of the coolant behaviour and of its turbulent mixing with mainflow, which affect, in turn, the film cooling capability and liner’s lifetime.

Keywords: film cooling; gas turbine; swirling flow (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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