Experimental investigation of a twin vortex breakdown on the draft tube models

Author

Tsoy, M.A. ; Skripkin, S.G. ; Shtork, S.I.

Author_Institution

Inst. of Thermophys., Novosibirsk State Univ., Novosibirsk, Russia

fYear

2015

fDate

27-30 May 2015

Firstpage

1

Lastpage

5

Abstract

This work is devoted to the experimental study of the flow structure in the hydro turbine draft tube models. A precessing helical vortex rope was formed at the flow with high swirling degree. Effect of transition between single- and double-vortex rope was revealed in different laboratory models. Frequency characteristics of the precessing structures were measured in the range Re = 5 · 10⁴ - 5 · 10⁵. From the analysis of high-speed camera records, the scenario of full transition between single and double vortex was proposed. The study of this phenomenon is of particular interest for the design and safe operation of hydraulic turbine equipment, because powerful pressure pulsations with unexpected frequency and amplitude may be generated in the flow.

Keywords

hydraulic turbines; hydroelectric power stations; safety; vortices; double-vortex rope; flow structure; helical vortex rope; high-speed camera records; hydraulic turbine equipment; hydroturbine draft tube models; pressure pulsations; single-vortex rope; swirling degree; twin vortex breakdown; Electron tubes; Frequency measurement; Hydraulic turbines; Hydrodynamics; Laser beams; Visualization; Frequency measurement; hydrodynamics; hydroelectric power generation; turbines;

fLanguage

English

Publisher

ieee

Conference_Titel

Energy (IYCE), 2015 5th International Youth Conference on

Conference_Location

Pisa

Print_ISBN

978-1-4673-7171-1

Type

conf

DOI

10.1109/IYCE.2015.7180821

Filename

7180821