Библиографическое описание:Numerical Simulation of a Swirling Flow in a Francis Draft Tube : научное издание / E. V. Palkin [et al.]. - Текст : непосредственный // Journal of Applied and Industrial Mathematics. - 2023. - Т. 17, № 1. - P. 156-162. - Numerical simulation was performed within the framework of a grant from the Russian Foundation for Basic Research, project no. 20-58-12012. Experimental studies were carried out under a grant from the Russian Science Foundation, project no. 21-79-10080. The development of the computational code was carried out within the framework of the scholarship of the President of the Russian Federation, grant no. SP-829.2021.1 and the state assignment for Kutateladze Institute of Thermophysics of the Siberian Branch of the Russian Academy of Sciences. - ISSN 1990-4789. - ISSN 1990-4797, DOI 10.1134/s1990478923010179.
Аннотация:We study the flow in a model Francis-99 draft tube for partial load conditions using Large-eddy simulation. The swirl is produced by the runner rotating with a constant angular velocity. Within the validation step, we compare results of eddy-resolving simulations with our Particle image velocimetry (PIV) and pressure measurements for three flow cases with different incoming flow rates. The time-averaged velocity fields agree well in experiments and simulation. To study the dynamical features, we analyze spectral characteristics of the flow featuring a strong coherent component. This vortical structure corresponds to the precessing vortex core (PVC) changing the shape and amplitude with the increase in the bulk velocity.
