Abstract
It is of significant value to understand the unsteady hydraulic features and pressure pulsation transmission path in the flow channel through a turbine for providing technical support for turbine design and optimization, as well as laying a foundation for analysis of the stability and the coupled vibration of the hydropower house. In this paper, a three-dimensional mechanics–hydraulics–concrete structure coupled numerical model was established to accurately simulate Francis hydraulic machinery, including the high-rotating turbine runner and fixed guide vane, the unsteady flowing water, the structure of the entire flow channel, as well as the dynamic interaction between them. Turbulent hydraulic features of flow condition and pressure pulsation in design operation were explored using the detached eddy simulation (DES) turbulence model. Then, a novel method was proposed to identify the fluid pressure pulsation transmission path based on the time-delayed transfer entropy method and wavelet theory. On basis of time and frequency analysis of pressure calculation results, investigation into identification of pressure pulsation transmission path was performed using the method of traditional transfer entropy and the method adopted in this paper. The pressure pulsation transmission features in the entire flow channel were revealed during operation of the large-scale Francis turbine. The research method and results could not only lay a basis for exploring the structural vibration regularity of the hydropower house but also provide a scientific reference for vibration reduction design of the hydropower house.
Highlights
Hydropower, one of the renewable and alternative energy sources for electricity generation, is becoming increasingly favorable with the installed unit capacity steadily increasing
Hydraulic features were accurately analyzed based on the SA-DES (Spalart-Allmaras detached eddy simulation) method and two-way iterative fluid–structure interaction (FSI) solver as in-house codes in ADINA (Automatic Dynamic Incremental Nonlinear Analysis) software, including flow condition and pressure pulsation in the entire flow channel through a Francis turbine during design operation, which lays a firm foundation for correct identification of the pressure pulsation transmission path
Solid a basically transient caused by dynamic interaction between fluid solid plays a importantpressure role in thepulsation analysis of the structural vibration transmission path in the and hydropower house
Summary
Hydropower, one of the renewable and alternative energy sources for electricity generation, is becoming increasingly favorable with the installed unit capacity steadily increasing. Hydraulic features were accurately analyzed based on the SA-DES (Spalart-Allmaras detached eddy simulation) method and two-way iterative FSI solver as in-house codes in ADINA (Automatic Dynamic Incremental Nonlinear Analysis) software, including flow condition and pressure pulsation in the entire flow channel through a Francis turbine during design operation, which lays a firm foundation for correct identification of the pressure pulsation transmission path. The research results reveal the transmission path of pressure pulsation in the entire flow channel of the hydropower house and render important guidance and engineering application prospects for design optimization and hydraulic performance evaluation of the Francis turbine, as well as laying a firm basis for studying the structural vibration regularity of the hydropower house
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