The turbulent flow structure in a wall jet blown through cylindrical holes into a transverse trench. Experiment and numerical simulation

The results of experimental and numerical studies of the turbulent flow structure of a wall gas jet injected through round holes into a transverse trench are presented. It is shown that the main advantage of this method of coolant supply in comparison with the classical blowing through cylindrical holes in the protected surface is achieved at large blowing ratios. At that, the formation of vortex structures inside the trench ensures more uniform output of the secondary flow in the transverse direction. Comparative analysis with the data of our measurements indicates a quantitative correspondence between the results of the experiments and simulations.