NUMERICAL SIMULATION OF FILM COOLING WITH A COOLANT SUPPLIED THROUGH HOLES IN A TRENCH

The results of numerical simulation and experimental investigation of the effi ciency of fi lm cooling behind a row of holes in a trench in the range of blowing ratio variation 0.5 ≤ m ≤ 2.0 are presented. This scheme is of practical interest for use in the systems of cooling the blades of high-temperature gas turbines. Comparative analysis has shown that the effi ciency of the trench scheme substantially exceeds the effi ciency of the traditional scheme. The commercial package ANSYS CFX 14 was used in the Calculation Fluid Dynamics (CFD) modeling of film cooling. It is shown that the best agreement between predicted and experimental data is provided by the use of the SST model of turbulence. Analysis of the physical picture of flow has shown that the higher efficiency of film cooling with secondary air supply to the trench is mainly due to the preliminary spreading of a coolant in the trench, decrease in the intensity and scale of the vortex pair structure, absence of the coolant film departure from the plate surface, and to the more uniform transverse distribution of the coolant film
   
Author:  A. A. Khalatov, N. A. Panchenko, I. I. Borisov, and V. V. Severina
Keywords:  film cooling, efficiency, holes in the trench, numerical simulation
Page:  637