Development of PSP Technique for Vane Film Cooling Investigations

Abdeh, Hamed; Miranda, Marco; Rouina, Samaneh; Barigozzi, Giovanna

doi:10.1016/j.egypro.2017.08.285

Cited by 13 publications

(4 citation statements)

References 17 publications

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“…Film cooling effectiveness traces become wider and longer for cases with CO 2 as coolant. These findings are in good agreement with the literature [32] and with data measured with TLC technique on the same geometry [29].…”

Section: Film Cooling Effectivenesssupporting

confidence: 93%

“…An uncertainty of  = 0.5% with  = 0.7 and of   15.6 % when  = 0.1 was computed. PSP results were also compared against TLC data from the same geometry and testing condition [29], showing a consistent behavior of the computed effectiveness in the investigated domain for variable BR. Nevertheless, TLC always overestimated the film cooling effectiveness levels in the near hole region, due to conduction and curvature effects.…”

Section: Pressure Sensitive Paints Set-upmentioning

confidence: 74%

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Experimental investigation of the interaction between showerhead coolant jets and main flow

Barigozzi

Casarsa

Pagnacco

et al. 2019

Experimental Thermal and Fluid Science

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This paper presents the results of an experimental investigation into the thermal and aerodynamic behavior of coolant ejection at the leading edge of a highly loaded nozzle vane cascade. The leading-edge cooling scheme features four rows of cylindrical holes in a staggered configuration (showerhead). Pressure Sensitive Paints (PSP) technique was used to get the adiabatic film cooling effectiveness distribution, while Particle Image Velocimetry (PIV) and flow visualizations were used to investigate the mixing process taking place between coolant and main flow. PSP tests were conducted by using N2 (Density Ratio DR=1.0) as coolant at variable blowing ratio (BR=2.0-4.0). Further tests were run by using CO2 (DR=1.5) at matching BR and momentum flux ratio (I) in order to investigate the effects of density ratio. The BR = 3.0 injection case was selected for the PIV investigation. Thermal and flow field data consistently show a shift in the position of stagnation line towards the suction side. Jet liftoff close to stagnation and a strong jet to jet as well as jet to mainstream interaction were also observed, resulting in a complex 3D flow characterized by high turbulence levels with a high degree of anisotropy. No coherent structures were detected, supporting the random nature of mixing process.

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Section: Film Cooling Effectivenesssupporting

confidence: 93%

Section: Pressure Sensitive Paints Set-upmentioning

confidence: 74%

Experimental investigation of the interaction between showerhead coolant jets and main flow

Barigozzi

Casarsa

Pagnacco

et al. 2019

Experimental Thermal and Fluid Science

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“…PSP technique was used to measure adiabatic film cooling effectiveness (η) on the surface of the flat plate (see Abdeh et al [14]). Contours of η obtained by injecting nitrogen as the coolant stream, are depicted in Figure 10.…”

Section: Thermal Aspects Of Film Coolingmentioning

confidence: 99%

Combined Experimental and CFD Investigation of Flat Plate Film Cooling through Fan Shaped Holes

Rouina

Ravelli

Barigozzi

2019

IJTPP

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The present paper reports the results of an experimental and computational investigation of flat plate film cooling jets discharged from three fan-shaped holes. Measurements have been carried out at near unity density ratio in a low-speed wind tunnel, at low inlet turbulence intensity, with blowing ratios (BR) of 1 and 2. Aerodynamic results have shown that the jet stays attached to the flat plate. Thermal measurements have revealed that film cooling effectiveness decreases downstream of the holes, and BR equal to 1 provides the best trade-off between cooling air consumption and thermal protection. Consequently, BR = 1 was selected for assessing the performance of different turbulence models, implemented in STAR-CCM+, according with the steady Reynolds-averaged Navier–Stokes (RANS) approach. Predictions from realizable k-ε (RKE), shear stress transport k-ω (SST KW) and Reynolds stress model (RSM) were compared against measurements of laterally averaged and centerline adiabatic effectiveness, as well as off-the-wall velocity maps and profiles of stress components. RSM provided the most accurate predictions.

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“…On the one hand, the experimental technique may affect the values of  that are measured. In fact,  levels determined by thermal methods, such as infrared thermography (IR) or liquid crystal, were found to be higher than those obtained by means of the masstransfer analogy method [2][3][4][5]. The reason is that thermal methods suffer from conduction effects.…”

Section: Introductionmentioning

confidence: 98%

Numerical evaluation of heat/mass transfer analogy for leading edge showerhead film cooling on a first-stage vane

Ravelli

Barigozzi

2019

International Journal of Heat and Mass Transfer

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Development of PSP Technique for Vane Film Cooling Investigations

Cited by 13 publications

References 17 publications

Experimental investigation of the interaction between showerhead coolant jets and main flow

Experimental investigation of the interaction between showerhead coolant jets and main flow

Combined Experimental and CFD Investigation of Flat Plate Film Cooling through Fan Shaped Holes

Numerical evaluation of heat/mass transfer analogy for leading edge showerhead film cooling on a first-stage vane

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