Maksiuta D. The combined method of aerodynamic optimization of the axial turbine stage

Research object: aerodynamic processes in the high-pressure stage axial turbine. The purpose of research is to develop a combined method of aerodynamic optimization of axial turbine stage, which uses a one-dimensional and three-dimensional models of simulation and takes into account both the nature of the flow around turbine profiles and the impact of leakage on it. Research methods: theoretical aspects of the work are based on the fundamental bases of the theory of fluid dynamics. Optimal design of the turbine stage was determined using design of experiment (DOE) with a high accurate formal metamodel, LP sequence of points and the coordinate descent method. Flow characteristics in the turbine cascades was calculated using computational fluid dynamics (CFD). Theoretical and practical results: combined method of the spatial optimization of the axial turbines, which can significantly increase the efficiency of the steam turbine stages was developed. Scientific novelty: for the first time was developed a combined method of aerodynamic optimization of axial turbine stage, which combines one-dimensional and three-dimensional models of fluid dynamic processes in a turbine stage for effective computational algorithm organization; for the first time using CFD simulations the method of leakage calculation for the shroud axial-radial seals depending on the geometrical, regime parameters and the thermal expansion was developed. Extent of introduction: Turbine Projection Chair of NTU "KHPI", "Turboatom" PJSC, Kharkov. Sphere of the use: turbine construction area.