Library Subscription: Guest

ISSN Online: 2379-1748

ISBN Flash Drive: 978-1-56700-472-4

ISBN Online: 978-1-56700-471-7

3rd Thermal and Fluids Engineering Conference (TFEC)
March, 4–7, 2018, Fort Lauderdale, FL, USA

PALLIATIVE COUNTERMEASURES FOR THE DRAFT TUBE SURGE IN HYDROPOWER PLANTS: A state-of-the art review.

Get access (open in a dialog) pages 901-914
DOI: 10.1615/TFEC2018.fli.024468

Abstract

The draft tube is the most critical compartment of reaction turbines that, since the embryonic stage of hydro-energy taping technology; is hitherto a threat to the desired efficient operation. This draft tube retro influence is preponderantly attributed to incurred off-load pressure pulsations that in fact, are mainly an interactive repercussion of semi-axially ingested complex flow features as they progressively try to get mutually amalgamated along a diffusing confinement. The notorious contribution is unarguably accounted for part-load vortex rope; which not only instigates flow instability, reverberating operation, whole installation deleterious vibrations, and penstock pressure surges; but also propels out output power swings, the runner meridional tendency to move and its texture deterioration. Since the inception of hydropower; plenty of efforts have been furnished to understand, mitigate or eliminate detrimental flow features of the draft tube. A great deal of draft tube researches, whether individual or collective projects have been conducted harping on the draft tube flow; Nevertheless, no cure-all remedy has been so far attained. Several reviews have perused the breakdown knottiness with its consequent pressure spectra in the draft tube; however, none (or few) have been recently laid down to show the engineering willingness as a palliative attempt to smooth out the draft tube surge. This work seeks at exclusively recapping various undertaken palliative countermeasures, both structural and fluidic attempts, which have pioneered and still attracting the draft tube research interestingness.