Evaluation of Heat Transfer Enhancement on Rotational Gas Turbine Blade Internal Cooling Channel With Dimpled Surface

Abstract

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.

Separation performance of hydrocyclone oil removal device influenced by oil droplet trajectory and oil drop characteristics

“…The development of the RSM occurred later than that of the two-equation mathematical model. 45 , 46 It strictly considers streamline bending, vortex, rotation, and rapid changes in tension and has the potential to predict complex flows with higher accuracy.…”