Film cooling behind two rows of trenches on a flat surface

Халатов, А. А.; Shiju, E; Wang, Dongyun; Donyk, T. V.

doi:10.1134/s0869864320040058

Cited by 2 publications

(6 citation statements)

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“…Figure 3 shows the calculated dependences of the film cooling effectiveness averaged within an individual strip over the plate width, whose general trend is similar to those on a flat plate with two rows of "shallow" trenches [9]. On the surface between the trenches, the cooling efficiency is almost the same along the channel width, and there is spreading of the curves along the surface width behind the second trench, which increases with the blowing ratio.…”

Section: Results Of the Study Of Film Cooling Efficiencymentioning

confidence: 55%

“…This asymmetry is observed almost immediately behind the second trench, and this asymmetry grows with the blowing ratio. The staggered arrangement of the holes produces a "nozzle effect" [9] since the jets flowing out of the second trench build a gas-dynamic obstacle for the jet-discrete flow behind the first trench and form local gasdynamic "nozzles." The flow velocity in their narrow section increases, thereby enhancing heat and mass transfer processes in this region.…”

Section: Results Of the Study Of Film Cooling Efficiencymentioning

confidence: 99%

“…ing effectiveness η averaged over the width of a flat plate on the dimensionless plate length x/d (here, x is the coordinate along the axis X) [9]. An analysis of Fig.…”

Section: Verification Of the Sst-modelmentioning

confidence: 99%

“…The results of studies on a flat surface have demonstrated the coolant jets from the front rows quickly merge, and the size of "kidney" vortex decreases due to the interaction of the mainstream and the coolant flow. With a two-row system of transverse "shallow" trenches on a flat surface [9], a transverse asymmetry in the film cooling is observed at m = 0.4-2.2, which increases with an increase in the blowing ratio. In the area between the first and second row of trenches near the end "strips," the film cooling effectiveness is 5-10% higher than that in the middle portion of channel.…”

mentioning

confidence: 96%

“…At present, the external cooling of blades in hightemperature gas turbines is usually implemented using multirow systems of discrete inclined holes [6][7][8][9][10][11]. The results of studies on a flat surface have demonstrated the coolant jets from the front rows quickly merge, and the size of "kidney" vortex decreases due to the interaction of the mainstream and the coolant flow.…”

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confidence: 99%

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Film Cooling of a Concave Surface with Two-Row Coolant Supply in Trenches

Халатов

Donyk

2021

Therm. Eng.

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The results of computer simulation of the film cooling efficiency on a concave surface with coolant supply through inclined round holes in shallow trenches are presented. The calculations were carried out in a range of blowing ratio m from 0.56 to 1.97 using the commercial computer package ANSYS CFX and the SST turbulence model. In the region between the trenches, the average (within an individual strip) cooling efficiency hardly changes at all in the transverse direction for all blowing ratios. Downstream of the second trench, the average cooling efficiency is nonuniform across the width of the concave surface and increases with the blowing ratio. The local (spot) cooling efficiency is nonuniform across the plate and becomes more uniform with an increase in the blowing ratio. For low blowing ratios, the number of local maximums in the cooling efficiency behind the first trench is equal to the number of film cooling holes. For m ≥ 1.12, the cooling efficiency is almost uniform and close to unity immediately behind the first trench, while it reduces on the side strips behind the second trench. The effectiveness of film cooling on a concave surface with two trenches has been demonstrated to be 5-11% lower than that on a flat surface under the same conditions.

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Section: Results Of the Study Of Film Cooling Efficiencymentioning

confidence: 55%

Section: Results Of the Study Of Film Cooling Efficiencymentioning

confidence: 99%

“…ing effectiveness η averaged over the width of a flat plate on the dimensionless plate length x/d (here, x is the coordinate along the axis X) [9]. An analysis of Fig.…”

Section: Verification Of the Sst-modelmentioning

confidence: 99%

mentioning

confidence: 96%

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confidence: 99%

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