Тип публикации: статья из журнала
Год издания: 2023
Идентификатор DOI: 10.1134/s1990478923010179
Ключевые слова: hydroturbine, draft tube, swirling flow, hydrodynamic instability, self-oscillation, precessing vortex core, turbulence, simulation, large-eddy simulation, mathematics, general
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 fПоказать полностьюor 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.
Журнал: Journal of Applied and Industrial Mathematics
Выпуск журнала: Т. 17, № 1
Номера страниц: 156-162
ISSN журнала: 19904789
Место издания: Moscow
Издатель: Pleiades Publishing, Ltd.