Curvature effects on the film cooling with the rotation

A computational heat transfer analysis was carried out to comprehend the mechanism of rotation and the curvature effect on the film cooling which is important in understanding the mixing process between the film coolant and the hot stream air over the high pressure turbine blades. The CFX code was used to investigate the mixing effects of the rotation and the curvature. Turbulence model is k-ω model which has received wide application in the case of rotation. It was found that both rotation and curvature could affect the distribution of the film cooling. Rotation could lead to the departure of the film flow from the wall. The cooling effect will be improved on the suction side as the curvature strength decreases. But on the pressure side, the departure of the film flow could be found. With the coolant-to-mainstream momentum flux ratio increased under unity, the film trajectory on the pressure side will bend towards the blade tip. But on the suction side, there is no clear influence.