Rudenko O. Multiparameter optimization of axial turbines flow paths taking into consideration the mode of operation

Research object: thermodynamic processes in thermal schemes of gas-turbine units and the aerodynamic phenomena in flow paths of axial turbines. The purpose of research is creation of a reliable and reasonable technique of axial turbines flow paths optimal design taking into account operation modes and development on its basis of the special software. Research methods: theoretical aspects of the dissertation are based on fundamental bases of the theory of hydrodynamics and thermodynamics; decomposition of the general optimization task according to structural hierarchy of turbine unit. For definition of influence of flow path geometry on its performance data the methods of mathematical modeling of a stream in the turbine are used. Theoretical and practical results: the developed optimization technique is suitable for design of flow path, both new, and modernized turbine units, any types and application fields; the technique of definition of nozzle blades positions, depending on an operation mode, can be used for the purpose of programs creation of nozzle devices regulation for existing axial turbines. Novelty: the technique of multiparameter optimization of flow paths geometrical parameters which considers predicted operational loads of the unit is first developed and approved; in algorithm of flow path optimization, for turbines with rotary nozzle blades, the technique of nozzles outlet angles definition depending on an operation mode is first included; within one technique the estimation of influence of flow path geometry optimization on integral characteristics of gas-turbine units is first executed. Extent of introduction: Turbine Projection Chair of NTU "KHPI", "Turbogaz" PJSC, Kharkov. Sphere of the use: turbine construction area.