Abstract
Abstract: We study the flow in a model Francis-99 draft tube for partial load conditions usingLarge-eddy simulation. The swirl is produced by the runner rotating with a constant angularvelocity. Within the validation step, we compare results of eddy-resolving simulations with ourParticle image velocimetry (PIV) and pressure measurements for three flow cases with differentincoming 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 strongcoherent component. This vortical structure corresponds to the precessing vortex core (PVC)changing the shape and amplitude with the increase in the bulk velocity.
| Original language | English |
|---|---|
| Pages (from-to) | 156-162 |
| Number of pages | 7 |
| Journal | Journal of Applied and Industrial Mathematics |
| Volume | 17 |
| Issue number | 1 |
| DOIs | |
| State | Published - Mar 2023 |
| Externally published | Yes |
UN SDGs
This output contributes to the following UN Sustainable Development Goals (SDGs)
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SDG 7 Affordable and Clean Energy
Keywords
- draft tube
- hydrodynamic instability
- hydroturbine
- large-eddy simulation
- precessing vortex core
- self-oscillation
- simulation
- swirling flow
- turbulence
All Science Journal Classification (ASJC) codes
- Industrial and Manufacturing Engineering
- Applied Mathematics
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