Evaluation of cavitation qualities of the impeller in the high-pressure turbine on the basis of mathematical model of working process in the averaged parameters

Предложена математическая модель рабочего процесса турбины, позволяющая производить анализ кавитационных качеств рабочего колеса на начальной стадии проектирования. Полученные зависимости позволяют производить прогнозную оценку энергетических качеств проточной части рабочего колеса на различных режимах работы. Математическая модель позволяет описывать рабочий процесс в проточной части на базе осредненных параметров потока на начальной стадии проектирования или ее модернизации. Произведен анализ влияния режимных параметров гидротурбины на ее кавитационные качества.The mathematical model of the working process of the turbine, allowing the analysis of cavitation qualities of the impeller at an initial stage of design. The obtained dependences allow to produce a predictive energy properties of a flowing part of the impeller for different operation modes. The mathematical model allows to describe the workflow in the flow path on the basis of the averaged parameters of the flow at the initial stage of design or modernization. As the most dangerous in the cavitation with respect to the selected point on the peripheral part of the impeller. To determine the energy losses in the draft tube was used the solution of axisymmetric fluid flow. The kinematic parameters of flow was determined using the equation of the relationship. The analysis of the influence of operating parameters of hydraulic turbine cavitation at its quality. The conclusion about the applicability of this method for comparative evaluation of cavitation properties of various impeller radial-axial hydraulic turbines. The calculations were performed for the hydraulic turbine at a pressure of 500 m