Abstract
In this paper, a turbine runner blade under hydraulic excitation was taken as the object of study and the mathematical hydrodynamic pressure model of a turbine runner blade under the rotor-stator interaction was established using quasi-three-dimensional finite element model. The regularity of the distribution of the hydrodynamic pressure was then investigated. First, the quasi-three-dimensional finite element model of a runner blade was established using the quasi-three-dimensional theory. Next, according to the pressure distribution from the numerical simulation, the mathematical mean pressure model of a node was established using the relative pressure difference method; the pressure fluctuation was then established taking the rotor-stator interaction into consideration. Then, based on the mean pressure and the pressure fluctuation of a node, the mathematical hydrodynamic pressure model for any position of a runner blade was obtained. Finally, the feasibility of the mathematical model was verified by an example analysis, and the internal relationship between the hydrodynamic pressure and its hydraulic parameters and the structural parameters of the blade was revealed, which provides a theoretical basis for further study of the dynamic characteristics of turbine runner blades under the rotor-stator interaction.
Highlights
Research ArticleReceived 31 October 2020; Revised 18 January 2021; Accepted 30 January 2021; Published 16 February 2021
Ese abnormal pressure pulses can cause the runner blades to vibrate intensely, and this can cause fatigue cracks to develop in the runner blade, which can seriously endanger the operation of the unit [2]. erefore, it is necessary to study the hydrodynamic pressure acting on a runner blade under the rotorstator interaction in the process of studying the dynamic characteristics of a runner blade
When numerical simulation has been used to study the hydrodynamic pressure of runner blades under the rotor-stator interaction, the pressure fluctuation under different working conditions was mainly studied through the use of finite element software such as CFD (Computational Fluid Dynamics)
Summary
Received 31 October 2020; Revised 18 January 2021; Accepted 30 January 2021; Published 16 February 2021. A turbine runner blade under hydraulic excitation was taken as the object of study and the mathematical hydrodynamic pressure model of a turbine runner blade under the rotor-stator interaction was established using quasi-threedimensional finite element model. En, based on the mean pressure and the pressure fluctuation of a node, the mathematical hydrodynamic pressure model for any position of a runner blade was obtained. The feasibility of the mathematical model was verified by an example analysis, and the internal relationship between the hydrodynamic pressure and its hydraulic parameters and the structural parameters of the blade was revealed, which provides a theoretical basis for further study of the dynamic characteristics of turbine runner blades under the rotor-stator interaction
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