Assessment of binary PSP technique for film cooling effectiveness measurement on nozzle vane cascade with cutback trailing edge

Barigozzi, Giovanna; Mucignat, Claudio; Abdeh, Hamed; Scandella, Davide; Dolci, Giorgio

doi:10.1016/j.expthermflusci.2018.05.015

Cited by 19 publications

(6 citation statements)

References 27 publications

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“…This is especially evident at the highest MFR of 1.5%. The same trend was observed at lower DR (Barigozzi et al (2018a)). As an example, results at DR = 1.0 are depicted in Fig.…”

Section: Filterssupporting

confidence: 78%

“…To follow, the influence of DR and Ma2is on secondary flow losses and platform cooling has been discussed, taking the case at high DR, low Ma2is and high Tu1 as a reference. Please, note that measurements at DR = 1, both for slot and discrete holes, have already been presented in previous papers (Barigozzi et al (2018a(Barigozzi et al ( ,2020) and hence included in the study for comparison.…”

Section: Resultsmentioning

confidence: 99%

“…This facility and the cascade model (Fig. 2) have been deeply described in Barigozzi et al (2018a). Only few details are summarized here for sake of clarity.…”

Section: Methodsmentioning

confidence: 99%

“…The binary formulation was selected in order to avoid undesirable temperature effects (Barigozzi et al (2018)). The calibration curve (Fig.…”

Section: Measurement Techniquesmentioning

confidence: 99%

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Experimental investigation of the influence of density ratio and vane exit mach number on platform cooling

Abdeh

Barigozzi

Ravelli

et al. 2021

European Conference on Turbomachinery Fluid Dynamics and Thermodynamics

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Experimental investigation and parametric analysis were carried out to evaluate the influence of coolant to mainstream density ratio (DR) and isentropic exit Mach number (Ma2is) on both thermal and aerodynamic performance of a nozzle vane cascade with platform cooling through slot or discrete cylindrical holes. Measurements were carried out on a 6-vane cascade for a base case scenario, which implied high DR of 1.5, high freestream turbulence intensity of Tu1 = 9.5% and Ma2is = 0.4, while varying the coolant-to-mainstream mass flow rate (MFR) between 0.5% and 1.5%. The impact of reducing DR to 1.0 and increasing Ma2is to 0.68 was assessed, MFR held constant. DR was varied by injecting either air/nitrogen or carbon dioxide as coolant flow, thanks to the pressure sensitive paint (PSP) technique. Lower thermal coverage derived from reduced DR whereas higher Ma2is resulted in enhanced cooling effectiveness over the perforated platform.

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“…This is especially evident at the highest MFR of 1.5%. The same trend was observed at lower DR (Barigozzi et al (2018a)). As an example, results at DR = 1.0 are depicted in Fig.…”

Section: Filterssupporting

confidence: 78%

Section: Resultsmentioning

confidence: 99%

“…This facility and the cascade model (Fig. 2) have been deeply described in Barigozzi et al (2018a). Only few details are summarized here for sake of clarity.…”

Section: Methodsmentioning

confidence: 99%

“…The binary formulation was selected in order to avoid undesirable temperature effects (Barigozzi et al (2018)). The calibration curve (Fig.…”

Section: Measurement Techniquesmentioning

confidence: 99%

See 2 more Smart Citations

Experimental investigation of the influence of density ratio and vane exit mach number on platform cooling

Abdeh

Barigozzi

Ravelli

et al. 2021

European Conference on Turbomachinery Fluid Dynamics and Thermodynamics

Self Cite

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show abstract

“…Thus, TE cooling effectiveness improvement can depend on controlling or reducing the vortex-strength. More recently, using a vane model with TE slot-outflow and double-row PS film ejections, Barigozzi et al 8,[13][14][15] Abdeh and Barigozzi 16 and Ravelli and Barigozzi 17 analyzed the time-averaged cooling effectiveness distributions and unsteady flow behaviors at the cutback surface and in the downstream region of film-holes. The key information was that the PS film ejections can improve properly the cooling effectiveness at entire cutback, but have a slight effect on the aerodynamic loss of entire vane.…”

Section: Introductionmentioning

confidence: 99%

Exit-shape effect of film holes at pressure side on trailing edge cutback film cooling characteristics

Wang

Song

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part A:

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Pressure side (PS) cutback structure has been widely employed in modern turbine blade trailing edge (TE) cooling design. However, hot gas flows around lip of TE slot to generate an impingement to cutback, resulting in a rapid decay of film cooling effectiveness and hence thermal damage of entire TE. Proper angled-ejections upstream of TE can suppress the downstream effectiveness-decay. Therefore, in present work, five types of film-holes were designed to discuss the effect of exit-shape of film-hole on TE film cooling characteristics, inlet boundary layer profile, fluid-interactions, discharge behaviors and total pressure losses. The studied models included cylindrical-hole, common and laidback fan-shaped film-holes, and converging slot-holes with two different exit-to-inlet area ratios ( ARs). The solo cutback cooling was chosen as a reference. Thermal tests were conducted in a hot wind tunnel featuring a simplified TE test section by infrared thermal technique. Engine-similar mainstream-to-coolant temperature ratio of 2.0 was controlled. Comparisons of experimental results revealed that the converging slot-holes can obtain the highest film cooling effectiveness at TE region and overall cooling effectiveness at PS film-plate, but the slightest increase of total pressure losses. Flow measurements using Particle Image Velocimetry technique indicated the converging slot-holes can modify the inlet boundary layer profile, suppress effectively the impingement of mainstream and change the flow separation features at cutback. In addition, applying shaped-holes can effectively suppress the flow ingestion under low coolant amounts. However, relative to the exit-shape effect, the coolant amount plays a more important role on the aerodynamic and thermal characteristics of TE cooling.

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Correction method for film cooling effectiveness measurement with temperature gradient using endoscopic PSP and TSP technique

Wang

Zhang

Zhou

et al. 2023

J Vis

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Assessment of binary PSP technique for film cooling effectiveness measurement on nozzle vane cascade with cutback trailing edge

Cited by 19 publications

References 27 publications

Experimental investigation of the influence of density ratio and vane exit mach number on platform cooling

Experimental investigation of the influence of density ratio and vane exit mach number on platform cooling

Exit-shape effect of film holes at pressure side on trailing edge cutback film cooling characteristics

Correction method for film cooling effectiveness measurement with temperature gradient using endoscopic PSP and TSP technique

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