Numerical Analysis of Film-Cooling over the Rotating Turbine Blade Using Laterally-Diffused Hole

In this paper, the optimization of the film cooling effectiveness over a rotating blade is performed using the laterally diffused hole. The three-dimensional numerical simulation of blade cooling is performed using RNG k-ε turbulence model for three rotating speeds, i.e., 0, 300 and 500 rpm. Results show that the film trajectory always inclines due to the Coriolis force acts in the centrifugal direction. The film cooling deflection becomes greater with increasing the rotational speed. The comparisons of results show that, for the laterally diffused hole, the mixing of the hot gas flow with the injected coolant flow is less that the cylindrical hole. Applying the laterally diffused hole consequences the increase of film cooling effectiveness by the 39, 38 and 35 percent at the rotating speeds of 0,300 and 500 rpm respectively.