Panchenko N. The film cooling efficiency over the flat plate at the coolant supply through the double jet holes.

The thesis is associated with the experimental and theoretical study of the flat plate film cooling fundamentals with double jet holes at the inlet. The new correlation is given for the free-stream turbulent flow with low external turbulence, the effects of external turbulence and flow acceleration were studied and relative correlations describing the influence of these factors were obtained. The experimental results of the film cooling efficiency obtained over a flat plate with the double jet hole configuration at the inlet have shown that at low (m=0,5) and medium (m=1,0) blowing ratio the cooling efficiency of this configuration is greater of the traditional scheme of two-array inclined cylindrical holes, however corresponds it at m=1,5 and more. The results of the computer simulation and surface streamlines visualization have shown that the main factors of the greater film cooling efficiency at low (m=0,5) and medium (m=1,0) blowing ratio are transformation of the kidney vortex structure and formation of the anti-kidney vortex pair with a cooling air spreading in the spanwise direction, which prevents penetration of the external flow to the cooled wall.