Computation of discrete slanted hole film cooling flow using the Navier-Stokes equations

An analysis and computational procedure were developed to predict flow and heat transfer which results from coolant injection through a single row of round holes oriented at an angle to a flat surface with the injection and free stream velocity vectors coplanar. This method solves the compressible Navier-Stokes equations and utilizes zone embedding, surface oriented coordinates, interactive boundary conditions, and an efficient split LBI scheme. The approach treats the near hole flow region where the film cooling flow is initially established. Prior studies considered only laminar flow to simplify development of the computational procedure. Under the present effort, several turbulence models suitable for the discrete hole film cooling problem were investigated by predicting a number of test cases from the 1980-81 AFOSR-HTTM Stanford Conference on Complex Turbulent Flows. The calculation of a discrete hole film cooling case for an injection angle of 35 degrees has been initiated using a mixing length turbulence model. These results will be compared with the experimental data of Kadotani and Goldstein, a recalculation with either a turbulence kinetic energy/algebraic length scale or a turbulence kinetic energy/warranted by the data comparison.