Gulakhmadov A. Improving efficiency of high-pressure hydraulic turbines workflow through developing the flow parts

The object of research: processes of energy interaction of fluid flow with Francis turbine operating elements. Research objective: ways to increase energy performance of Francis turbines by constructing mathematical models and improved workflow. Methods: the problems set in the thesis solved by applying methods of computational fluid dynamics. Research findings: a new set of programs developed for the design andcomputation of Francis turbine impellers. A software-based numerical experiment allowed to assess the energy parameters of the designed blade system, improve the design quality, and reduce design time through selection of the best options to reduce the costs of developing the turbine. The developed numerical experiment techniques provide for a targeted search of the improved versions of the flow part according to energy performance requirements of the turbine. Novelty: Improved performance design flow parts suggested for the high-pressure Francis turbine by harmonising kinematic and geometrical parameters of the flow part elements. A promising flow part developed for the high-pressure Francis turbine with theoretical high energy performance. An improved mathematical model of energy flow interaction with hydraulic turbine found, considering the impact of all flow part elements on Francis turbine energy characteristics. Design methods for flow parts of high-pressure Francis turbines improved. A new method of predicting energy characteristics developed and tested. Validation: Department of hydraulic machinery, Kharkiv Polytechnic Institute, Turboatom OJSC, Kharkiv. Field of application: power engineering.