Numerical simulations were carried out to study the adiabatic film cooling effectiveness distributions on the suction side of a high pressure turbine blade under rotating condition. The chord and height of the blade are 60mm and 80mm, respectively. Three rows of round holes with diameter of 0.8mm are located in aligned arrangement on the suction side of the blade. Film hole arrangements with different film cooling hole row spacing are studied. The first row of film cooling holes is fixed at streamwise location of 13.5%. Three injection angles, 30°, 45°, and 60°, were also taken into consideration of the film hole row arrangement optimization. The injection angle of the film cooling holes in the same row is the same. Simulations were conducted with three rotational speeds, 1000rpm, 3000rpm, and 5000rpm with blowing ratio varying from 0.5 to 3.0. Reynolds numbers corresponding to rotational speeds are 67600, 202800, and 338000, respectively. The density ratio in the simulations is controlled at 1.47. Numerical simulations were performed using the hexahedral structured grids and SST turbulence model. The results of simulations were obtained by solving the three-dimensional Reynolds-averaged Navier–Stokes equations. Results showed that the spacing between the film hole rows has great effect on film cooling effectiveness distributions. A superior film cooling performance is achieved when the spacing of film hole rows is smaller. A smaller injection angle can lead to a more uniform film cooling effectiveness distribution in spanwise. As the rotational speed increasing, the film trajectories deflect toward the tip of the blade, which changes the film coverage and then the film cooling effectiveness distributions. With the increase of blowing ratio, the optimum film cooling performance of different film hole arrangement appears at different blowing ratio.


Film Cooling Performance on Turbine Blade Suction Side With Various Film Cooling Hole Arrangements

Division / Sponsor:
International Gas Turbine Institute (IGTI)

Paper Proceedings: https://asmedigitalcollection.asme.org/GT/GT2020/volume/84058

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