A novel scenario of aperiodical impacts appearance in the turbine draft tube

S. V. Alekseenko, P. A. Kuibin, S. I. Shtork, S. G. Skripkin, V. I. Sonin, M. A. Tsoy, A. S. Ustimenko

Результат исследований: Материалы для журнала

6 Цитирования (Scopus)

Выдержка

The swirling flow in the discharge cone of hydroturbine is characterized by various self-induced instabilities and associated low frequency phenomena when the turbine is operated far from the best efficiency point. In particular, the precessing vortex rope develops at part-load regimes in the draft tube. This rope can serve a reason of the periodical low- frequency pressure oscillations in the whole hydrodynamical system. During the experimental research of flow structure in the discharge cone in a regime of free runner new interesting phenomenon was discovered. Due to instability some coils of helical vortex close to each other and reconnection appears with generation of a vortex ring. The experiments were fulfilled at the cavitational conditions when a cavity arises in the vortex core. So the phenomenon was registered with help of visualization by the high speed video recording. The vortex ring after the reconnection moves apart from the main vortex rope toward the wall and downstream. When it reaches the area with high pressure the cavity collapses with generation of pressure impact. The mechanism of cavitational vortex rings generation and their further collapse can serve as a prototype of the aperiodical pressure impacts inside the turbine draft tube.

Язык оригиналаАнглийский
Номер статьи082025
ЖурналIOP Conference Series: Earth and Environmental Science
Том49
Номер выпуска8
DOI
СостояниеОпубликовано - 13 дек 2016
Опубликовано для внешнего пользованияДа
Событие28th IAHR Symposium on Hydraulic Machinery and Systems, IAHR 2016 - Grenoble, Франция
Продолжительность: 4 июл 20168 июл 2016

Отпечаток

turbine
vortex
cavity
flow structure
visualization
oscillation
experiment

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

Цитировать

A novel scenario of aperiodical impacts appearance in the turbine draft tube. / Alekseenko, S. V.; Kuibin, P. A.; Shtork, S. I.; Skripkin, S. G.; Sonin, V. I.; Tsoy, M. A.; Ustimenko, A. S.

В: IOP Conference Series: Earth and Environmental Science, Том 49, № 8, 082025, 13.12.2016.

Результат исследований: Материалы для журнала

Alekseenko, S. V. ; Kuibin, P. A. ; Shtork, S. I. ; Skripkin, S. G. ; Sonin, V. I. ; Tsoy, M. A. ; Ustimenko, A. S. / A novel scenario of aperiodical impacts appearance in the turbine draft tube. В: IOP Conference Series: Earth and Environmental Science. 2016 ; Том 49, № 8.
@article{c3e3a3eb42ff45a68c5ef4d4f7a67681,
title = "A novel scenario of aperiodical impacts appearance in the turbine draft tube",
abstract = "The swirling flow in the discharge cone of hydroturbine is characterized by various self-induced instabilities and associated low frequency phenomena when the turbine is operated far from the best efficiency point. In particular, the precessing vortex rope develops at part-load regimes in the draft tube. This rope can serve a reason of the periodical low- frequency pressure oscillations in the whole hydrodynamical system. During the experimental research of flow structure in the discharge cone in a regime of free runner new interesting phenomenon was discovered. Due to instability some coils of helical vortex close to each other and reconnection appears with generation of a vortex ring. The experiments were fulfilled at the cavitational conditions when a cavity arises in the vortex core. So the phenomenon was registered with help of visualization by the high speed video recording. The vortex ring after the reconnection moves apart from the main vortex rope toward the wall and downstream. When it reaches the area with high pressure the cavity collapses with generation of pressure impact. The mechanism of cavitational vortex rings generation and their further collapse can serve as a prototype of the aperiodical pressure impacts inside the turbine draft tube.",
author = "Alekseenko, {S. V.} and Kuibin, {P. A.} and Shtork, {S. I.} and Skripkin, {S. G.} and Sonin, {V. I.} and Tsoy, {M. A.} and Ustimenko, {A. S.}",
year = "2016",
month = "12",
day = "13",
doi = "10.1088/1755-1315/49/8/082025",
language = "English",
volume = "49",
journal = "IOP Conference Series: Earth and Environmental Science",
issn = "1755-1307",
publisher = "IOP Publishing Ltd.",
number = "8",

}

TY - JOUR

T1 - A novel scenario of aperiodical impacts appearance in the turbine draft tube

AU - Alekseenko, S. V.

AU - Kuibin, P. A.

AU - Shtork, S. I.

AU - Skripkin, S. G.

AU - Sonin, V. I.

AU - Tsoy, M. A.

AU - Ustimenko, A. S.

PY - 2016/12/13

Y1 - 2016/12/13

N2 - The swirling flow in the discharge cone of hydroturbine is characterized by various self-induced instabilities and associated low frequency phenomena when the turbine is operated far from the best efficiency point. In particular, the precessing vortex rope develops at part-load regimes in the draft tube. This rope can serve a reason of the periodical low- frequency pressure oscillations in the whole hydrodynamical system. During the experimental research of flow structure in the discharge cone in a regime of free runner new interesting phenomenon was discovered. Due to instability some coils of helical vortex close to each other and reconnection appears with generation of a vortex ring. The experiments were fulfilled at the cavitational conditions when a cavity arises in the vortex core. So the phenomenon was registered with help of visualization by the high speed video recording. The vortex ring after the reconnection moves apart from the main vortex rope toward the wall and downstream. When it reaches the area with high pressure the cavity collapses with generation of pressure impact. The mechanism of cavitational vortex rings generation and their further collapse can serve as a prototype of the aperiodical pressure impacts inside the turbine draft tube.

AB - The swirling flow in the discharge cone of hydroturbine is characterized by various self-induced instabilities and associated low frequency phenomena when the turbine is operated far from the best efficiency point. In particular, the precessing vortex rope develops at part-load regimes in the draft tube. This rope can serve a reason of the periodical low- frequency pressure oscillations in the whole hydrodynamical system. During the experimental research of flow structure in the discharge cone in a regime of free runner new interesting phenomenon was discovered. Due to instability some coils of helical vortex close to each other and reconnection appears with generation of a vortex ring. The experiments were fulfilled at the cavitational conditions when a cavity arises in the vortex core. So the phenomenon was registered with help of visualization by the high speed video recording. The vortex ring after the reconnection moves apart from the main vortex rope toward the wall and downstream. When it reaches the area with high pressure the cavity collapses with generation of pressure impact. The mechanism of cavitational vortex rings generation and their further collapse can serve as a prototype of the aperiodical pressure impacts inside the turbine draft tube.

UR - http://www.scopus.com/inward/record.url?scp=85012154526&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85012154526&partnerID=8YFLogxK

U2 - 10.1088/1755-1315/49/8/082025

DO - 10.1088/1755-1315/49/8/082025

M3 - Conference article

AN - SCOPUS:85012154526

VL - 49

JO - IOP Conference Series: Earth and Environmental Science

JF - IOP Conference Series: Earth and Environmental Science

SN - 1755-1307

IS - 8

M1 - 082025

ER -