The present investigation represents the rotational effect on gas turbine blade internal cooling with a uniform heat flux of 2,000 W/m2 at the bottom wall. The experiment was conducted with three different RPMs, such as 300 RPM, 600 RPM, and 900 RPM with Reynolds number (Re) ranging from 6,000 to 50,000 with a two-pass cooling channel. The numerical investigation was conducted with the Large Eddy Simulation (LES) technique to understand the rotational flow behavior of the cooling channel. Four distinct arrangements of dimpled cooling channel surfaces were considered with two different dimple shapes, i.e., partial spherical and leaf. It is found that the rotation effect, dimple arrangement, and design have significant influences on heat transfer. Results indicated that the partial spherical 1-row dimpled surface experienced the highest heat transfer coefficient and pressure drop. In contrast, the leaf-shaped dimpled cooling channel experienced the highest thermal efficiency.
The purpose of the current study is to find out the heat transfer and pressure drop phenomena of the cooling channel with dimples and guide vane and compare the results with the no guide vane dimpled cooling channel. The first leg of the cooling channel is 490mm, and the second leg is 460 mm. The two legs relate to the 180 deg turn region. The guide vane was inserted at the bend region of the dimpled cooling channel. The study was conducted with two different guide vanes geometry at two different orientations, i.e., U-guide vane with protrusion and depression orientation and Curve -guide vane with protrusion and depression orientations both experimentally and numerically. The numerical study was performed with the large eddy simulation method. The result shows that both for stationary and rotational motion, the U-guide vane with depression experiences the highest thermal performance. The friction factor is comparatively higher for Curve – guide vane with protrusion under stationary motion. However, under rotation, the Curve- protrusion guide encounters the highest friction factor, which is higher compared to the no-guide vane cooling channel.
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