A comperative experimental study between the film effectiveness of trench and diffusion film holes

Balaji, Sainathkaushik; Fan, Yang; Taslim, M. E.

doi:10.1016/j.ijthermalsci.2020.106713

Cited by 6 publications

(2 citation statements)

References 13 publications

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“…Basic geometries like tangential injection layers, reverse coolant injection, and angled slots can be found in his study. Over the years, researchers [4][5][6][7][8][9][10][11][12][13][14] have improved the effectiveness by continuously developing different geometries. Bunker [15] summarized the literature on shaped hole film cooling over 30 years.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Studies of the Film Cooling Effectiveness Downstream of a Curved Diffusion Film Cooling Hole

Fan

Taslim

2022

International Journal of Rotating Machinery

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Film cooling technology is a commonly used method for thermal protection of gas turbines’ hot sections. A new, shaped, film cooling hole is proposed in this study. The geometry is made of a straight-through cylindrical feed hole at an inclination angle of 30° followed by an expansion section. The expansion section is created by the rotation of the same circular hole on the inclination plane about an axis normal to that plane which passes through the center of the feed hole exit area. This shape was designed to decrease the deteriorating effects of kidney vortices by proper distribution of the coolant flow emerging from the hole exit area. Cases with four rotation angles (7°, 14°, 17.5°, and 21°) were studied both experimentally and numerically and for the blowing ratios of 0.5, 1, and 2.0. For comparisons, the commonly used 7°-7°-7° diffusion hole geometry was also tested under otherwise identical conditions. For data collection, the pressure-sensitive paint (PSP) technique was used to measure the film cooling effectiveness. Streamwise- and spanwise-averaged film effectiveness results were obtained to compare the performance of different geometries. The main conclusions were that the case of 21° rotation angle produced the highest film effectiveness and outperformed the 7°-7°-7° diffusion hole geometry.

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Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Studies of the Film Cooling Effectiveness Downstream of a Curved Diffusion Film Cooling Hole

Fan

Taslim

2022

International Journal of Rotating Machinery

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“…Park et al [18] studied film cooling effectiveness of three antivortex hole geometries at three mainstream turbulence levels. Their conclusion was that all antivortex film hole cases showed higher film cooling effectiveness than the cylindrical hole, and as the mainstream turbulence intensity increased, the film [27], and Balaji et al [28] reported on the film effectiveness results of tripod or sister antivortex holes on flat or curved surfaces. Positions and diameters of the side holes are the two key parameters that affect the overall performance at a given blowing ratio.…”

Section: Introductionmentioning

confidence: 99%

Experimental Film Cooling Effectiveness of Three-Hole-Branch Circular Holes

Fan

Taslim

2021

International Journal of Rotating Machinery

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A three-hole-branch geometry for film cooling is proposed. Each branch is made up of a streamwise 30°-angled circular hole with a circular hole of the same diameter on each side of it. These three holes share the same inlet area on the coolant supply side. Three side hole inclination angles of 30°, 37.5°, and 45° and three branch angles (the angle between the main and side holes) generated nine configurations that were tested for four blowing ratios of 0.5, 1, 1.5, and 2. To their benefits, these straight-through circular holes could easily be laser drilled on the airfoils or other gas turbine hot section surfaces. For comparative evaluation of these film hole geometries, the commonly used 7°-7°-7° diffusion hole geometry with the same inlet hole diameter was tested as a baseline under otherwise identical conditions. The pressure-sensitive paint (PSP) technique was utilized to test these geometries for their film cooling effectiveness. Depending on the branch geometry, for the same amount of coolant, some configurations were found to be superior to the baseline case for stream- or spanwise film cooling distributions while for the steeper side hole angles, these branched holes did not perform as well as the baseline case. The main conclusion is that the three holes with the same inclination angle of 30° exhibited the best film cooling effectiveness performance including the baseline geometry.

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Film cooling performance on pressure side of turbine blade with different number of hole rows under rotating state

Meng

Xie

et al. 2022

Aerospace Science and Technology

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A comperative experimental study between the film effectiveness of trench and diffusion film holes

Cited by 6 publications

References 13 publications

Experimental and Numerical Studies of the Film Cooling Effectiveness Downstream of a Curved Diffusion Film Cooling Hole

Experimental and Numerical Studies of the Film Cooling Effectiveness Downstream of a Curved Diffusion Film Cooling Hole

Experimental Film Cooling Effectiveness of Three-Hole-Branch Circular Holes

Film cooling performance on pressure side of turbine blade with different number of hole rows under rotating state

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