Numerical Approach at Flat Plate for Predicting the Film Cooling Effectiveness Part B: Effect Injection Angle

Abstract

In order to improve the cooling effectiveness of the film, a numerical study was conducted to study the effects of different film-cooled angles on surface heat transfer. In this work CFD simulation has revealed the difference of injection angles ranging from 35°,45°,55°,65° and 90° with different blowing, where the low blowing ratios are represented by M = 0.5, and the high blowing ratios by M = 1.0 and 1.5. And the turbulence closure is done with the help of the k - ω shear stress transport (SST) turbulence model. It is found that the stream-wise variations in the angles of the holes do not really provide a significant change in the adiabatic film cooling effectiveness results. On the other hand, the results indicate that the hole of angles 35°and 45° improved the centerline and laterally averaged adiabatic effectiveness, and the effectiveness decrease particularly at high blowing ratios.

Computational Analysis on Gas Turbine Blade by Hole Modified for Optimization the Effectiveness

“…Martini et al [26] investigated how three different slot designs used in modern blades affect the film cooling effectiveness, heat transfer coefficients and discharge coefficients in the near slot region of the cutback. These geometries featured different internal slot geometries but no external lands on the cutback surface.Kebir et al [27,28] investigate the effect of injection angles and blowing ratio in flat plate to predict on the film cooling effectiveness. Simulation has revealed the difference of injection angles ranging from 35°,45°,55°,65° and 90° with different blowing, where the low blowing ratios are represented by M = 0.5, and the high blowing ratios by M = 1.0 and 1.5.…”