Ivanchenko O. Calculation researches of heat transfer on the blades of gas turbines with the use of the modified algebraic models of turbulence

Research object: a process of local heat exchange on a blade in the zone of turbulent boundary layer, namely design of properties of hydrodynamic boundary layer taking into account the phenomena that is observed in it. A research aim is an improvement of methodology of calculation of local heat exchange on the blade of gas turbine due to the use of the modified algebraic models of turbulence. Research methods: theoretical positions of dissertation are base on theories of hydrodynamics and heat exchange. For the receipt of descriptions of hydrodynamic boundary layer the methods of calculable hydrodynamics were used. Calculation researches are executed with the use of method of eventual differences of Pletcher and DuFort-Frankel. Theoretical and practical results: the worked out methodology of calculation of local coefficients of heat transfer on profile of blade of gas turbine is suitable for using for development and optimization of the systems of cooling of high temperature gas turbines. The use in the process of optimization of more reliable values of coefficients of heat transfer will allow considerably to promote their reliability and resource of their work. Novelty: methodology for the calculation of heat exchange uses flowing around of blades of gas turbines of model of turbulence specially is first worked out for terms; the algebraic models of turbulence, that take into account the specific of flow of working body in the grates of turbines, are first worked out, in particular, longitudinal gradient of pressure and turbulence of external stream; modification of universal "law of wall", used for description profile of speed in a turbulent boundary layer at presence of longitudinal gradient of pressure is offer first. Extent of introduction: Turbine Projection Chair of NTU "KHPI", OC "Turboatom", Kharkiv. Sphere of the use: turbine construction area.