Numerical Study of Film Cooling For Various Coolant Inlet Geometries

摘要

The paper deals with the computational investigation of film cooling effectiveness and heat transfer on a 3D flat plate with a cylindrical, elliptic and triangular holes having an inclination of 300. Main flow temperature is kept constant at 600K and that of coolant at 300K for all the cases. Centerline and spatially averaged effectiveness are presented for film cooling measurements along non-dimensional temperature profiles in each case. The results for cylindrical case are compared with experimental results and are well in agreement with the experimental results. Comparative studies conducted for the adiabatic film cooling effectiveness and heat transfer coefficient with the three geometries tested (cylindrical, elliptical and triangular hole) reveals that the triangular hole shows much higher effectiveness values than cylindrical case in the near hole region. Also it is observed that triangular hole shows lesser coolant jet height and higher film cooling effectiveness in the region x/D>10, especially at blowing ratios greater than 1.0.