Phan C. Aerodynamic improvement of turbo-machine blade cascades on the basis of inverse problems

Research object - aerodynamic processes in flowing pass of turbo-machine. Objective - the gas-dynamic descriptions of the blade cascades. Research purpose - the development of method for the solution of direct and inverse problems of flow in cascades of turbo-machines in a layer of variable thickness at the axisymmetric stream surface, which takes into account the features of organization of calculable process in the optimal design problems. Theoretical and practical results - the method for the solution of direct and inverse problems of flow in cascades of turbo-machines in a layer of variable thickness at the axisymmetric stream surface is developed; it takes into account the features of organization of calculable process in the optimal design problems of nozzle and rotor cascades of turbo-machine; the computer programs for the calculation of flow within the limits of direct and inverse problems and for the solution of the optimal design problem of cascades taking into account the profile and second losses is developed; the new profile for high-deflection cascades of power steam-turbines is created. Novelty - it is developed the method that allows to solve both the inverse and direct problems for the flow on an arbitrary axisymmetric stream surface based on a single methodological position; it provides the same accuracy of results for both problems; direct and inverse problems are divided into separate sub-problems that can be solved in any sequence or at the same time; it provides the ability to control some parts of the designed blade in terms of strength and processability and can significantly reduce design time; separate sub-problems are solved by methods of non-linear programming, which do not require storing significant amounts of information; the technology of optimal design for high-deflection blade cascade is developed; blade cascade of power high pressure steam turbine is designed with wavy contours of blade profiles; the second losses in the blade cascades with such designed profiles was much lower than with atlas profiles usage. Degree of the implementation - Turbine Department of NTU "KhPI",VAT "Turboatom". Industry of the use - engineering.