Due to the higher cooling requirements of novel combustor liners a comprehensive understanding of the phenomena concerning the interaction of hot gases with different coolant flows plays a major role in the definition of a well performing liner. The aim of this study was the measurement of adiabatic and overall effectiveness of a real engine cooling scheme of a combustor liner by means of a steady-state Thermochromic Liquid Crystals (TLC) technique, considering the combined effects of slot, effusion cooling and dilution holes. Experiments were carried out imposing three different effusion velocity ratios typical of modern engine working conditions (VReff=3;5;7) and keeping constant slot flow parameters (VRsl=1.1). To reproduce the effects due to the different density between coolant and hot gas inside a real combustor, effusion and dilution holes were fed by carbon dioxide (CO2), while air was used in the main channel; to point out the influence of density ratio between the two flows, measurements were carried out using air as coolant too. The experimental analysis was performed on a test article replicating a slot injection and an effusion array with a central large dilution hole. Test section consists of a rectangular cross-section duct and a flat perforated plate with 272 holes arranged in 29 staggered rows (d=1.65mm, Sx/d=7.6, Sy/d=6, L/d=5.5, alpha=30deg); a dilution hole (D/d=11.36mm) is located at the 14th row. Both effusion and dilution holes are fed by a channel replicating combustor annulus, that allows to control cold gas side cross-flow parameters, especially in term of Reynolds of both annulus and effusion holes . Upstream the first effusion row, a 6.0 mm high slot ensure the protection of the very first region of the liner. Results, reported in terms of detailed 2D maps of the film cooling effectiveness generated by the cooling system and 1D trends along the liner centerline, point out both the influence of density and velocity ratios, and the effects due to the presence of the slot.

Comparison of psp and tlc steady state techniques for adiabatic effectiveness measurement on a multiperforated plate / Gianluca Caciolli; Bruno Facchini; Alessio Picchi; Lorenzo Tarchi. - ELETTRONICO. - (2012), pp. 0-0. (Intervento presentato al convegno 67° Congresso nazionale ATI).

Comparison of psp and tlc steady state techniques for adiabatic effectiveness measurement on a multiperforated plate

CACIOLLI, GIANLUCA;FACCHINI, BRUNO;PICCHI, ALESSIO;
2012

Abstract

Due to the higher cooling requirements of novel combustor liners a comprehensive understanding of the phenomena concerning the interaction of hot gases with different coolant flows plays a major role in the definition of a well performing liner. The aim of this study was the measurement of adiabatic and overall effectiveness of a real engine cooling scheme of a combustor liner by means of a steady-state Thermochromic Liquid Crystals (TLC) technique, considering the combined effects of slot, effusion cooling and dilution holes. Experiments were carried out imposing three different effusion velocity ratios typical of modern engine working conditions (VReff=3;5;7) and keeping constant slot flow parameters (VRsl=1.1). To reproduce the effects due to the different density between coolant and hot gas inside a real combustor, effusion and dilution holes were fed by carbon dioxide (CO2), while air was used in the main channel; to point out the influence of density ratio between the two flows, measurements were carried out using air as coolant too. The experimental analysis was performed on a test article replicating a slot injection and an effusion array with a central large dilution hole. Test section consists of a rectangular cross-section duct and a flat perforated plate with 272 holes arranged in 29 staggered rows (d=1.65mm, Sx/d=7.6, Sy/d=6, L/d=5.5, alpha=30deg); a dilution hole (D/d=11.36mm) is located at the 14th row. Both effusion and dilution holes are fed by a channel replicating combustor annulus, that allows to control cold gas side cross-flow parameters, especially in term of Reynolds of both annulus and effusion holes . Upstream the first effusion row, a 6.0 mm high slot ensure the protection of the very first region of the liner. Results, reported in terms of detailed 2D maps of the film cooling effectiveness generated by the cooling system and 1D trends along the liner centerline, point out both the influence of density and velocity ratios, and the effects due to the presence of the slot.
2012
67° Congresso nazionale ATI
67° Congresso nazionale ATI
Gianluca Caciolli; Bruno Facchini; Alessio Picchi; Lorenzo Tarchi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/795051
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