Film cooling predictions of simple and compound angle injection from one and two staggered rows

Typical film-cooling configurations of flat plates from one and two stagger ed rows of simple and compound angle injection holes are investigated using a three-dimensional finite volume method and a multiblock technique, which reduces significantly the core memory needed for the computations and give s more freedom in the generation of the grids. The computational method use s arbitrary curvilinear, body-fitted, multiblock, structured, nonstaggered grids. The turbulence is approximated by a standard k-epsilon model with wa ll functions. The accuracy of the code is improved by using a second-order- bounded scheme for convection terms for all equations including the k and e psilon turbulence model equations. The influence of number of rows and inje ction angles as well as the blowing ratio on the film cooling protection ha s been investigated and compared with experimental data. Comparison between predicted and experimental results indicates that the trends of the stream wise mean velocity and thermal fields are well predicted in most cases. How ever, the span wise-averaged film cooling effectiveness is globally underpr edicted by the code, probably because of the limited capability of the turb ulence model used. Good agreement is obtained between the predictions and m easurements made downstream of two rows of compound angle injection.