The Performance Comparison Between Modelled and Fully Simulated Porous Media in Turbine Blade Cooling

The recent cooling methods are still having low efficiency since the amount of cooling air must be provided. Therefore, it should be developed the innovative cooling methods. The application of a porous media is considered as a promising technique in the cooling of turbine blade. This is because of high surface area to volume ratio in the heat transfer process and the intensive flow mixing which is caused by the complicated to tortuous path of the porous structure. Porous media is widely explored which are numerically, experimentally and analytically studied. For numerical area, porous media is modelled and fully simulated as the present study. Modified of NASA C3X by Hylton was adopted as model geometry. Porous media is installed in the mid span of NASA C3X with 1/3 length of cooling passage. The present investigation employed a numerical model by using Ansys 19.2. The results show that porous media give favorable effect for turbine blade cooling. Porous media contribute to make temperature distribution lower and more uniform. Therefore, porous media become promising cooling technique to prevent stress thermal failure. For the normalized temperature shows that the difference between porous media which is modelled and fully simulated is 0.46%. It means that there is no significance difference between modelled and fully simulated methods. For contour temperature there is slightly difference between modelled and fully simulated methods. For fully simulated method the contour temperature is lower than modelled method. This is due to for fully simulated the form of porous media is sphere. Sphere has been proven to have the greatest cooling effectiveness compared to other form. While for modelled method the form of porous media is arbitrary.