Publication detail
Spatio-temporal description of the swirling flow in hydraulic turbine draft tube
RUDOLF, P. ŠTEFAN, D.
English title
Spatio-temporal description of the swirling flow in hydraulic turbine draft tube
Type
Paper in proceedings (conference paper)
Language
en
Original abstract
Highly swirling flow leaves runner of the hydraulic turbine, which is operated off the best efficiency point. Instability of the swirling flow results in so called vortex rope. Rotating vortex rope is a source of pressure pulsations, causes structural loads, vibrations and noise. Proper orthogonal decomposition (POD) provides a spatio-temporal description of the draft tube swirling flow and proves that only a very limited number of the flow eigenmodes is necessary to describe the flow dynamics. Construction of the reduced order model (ROM), which is derived by projection of Navier-Stokes equation onto POD basis forms a suitable state equation for the draft tube flow control. Paper presents review of POD application to draft tube flows and proposal of extension to ROM and closed loop flow control.
Keywords in English
draft tube, vortex rope, POD, ROM, control
Released
2014-11-26
Publisher
TU Wien
Location
Vienna
ISBN
978-3-9501937-9-4
Book
Proceedings of 18th International Seminar on Hydropower
Pages from–to
191–201
Pages count
10
BIBTEX
@inproceedings{BUT111329,
author="Pavel {Rudolf} and David {Štefan}",
title="Spatio-temporal description of the swirling flow in hydraulic turbine draft tube",
booktitle="Proceedings of 18th International Seminar on Hydropower",
year="2014",
pages="191--201",
publisher="TU Wien",
address="Vienna",
isbn="978-3-9501937-9-4"
}