Heat transfer and gas dynamics of surface-vortex film cooling configurations of high- performance gas turbine engine blades
The novel technology was developed of heat transfer, gasdynamics, and film cooling efficiency prediction of high-performance gas turbine blades providing high accuracy of calculations.This technology takes into consideration stationary conditions and rotation of of cooled surface, blowing ratio, external flow speed, surface geometric shape (flat, concave, or convex), surface indentations configuration (spherical or rectangular), multi-row of coolant supply. The turbulence model is used which describes adequately heat transfer and gasdynamics, physical features defining film cooling efficiency, flowing of turbulent flow in rotation, temperature factor, and flow compressibility. The new data regarding physical structure were obtained, more precise physical model of heat transfer and gasdynamics in stationary conditions, as well as in rotation, new correlations on heat transfer and film cooling efficiency at the coolant supply into surface indentations of different shape were presented. Based on the new physical model of heat transfer and gasdynamics new film cooling designs of high-performance gas turbine blades of a surface-vortex type were developed protected by two patents of Ukraine. Results of studies enable to increase remarkably (by 2-3%) the efficiency of modern high-performance gas turbines. Also, results of studies are an important contribution to the development of the theory and practice of new cooling systems for the blades of high-temperature gas turbines for various applications.