LDA analysis of swirling flow in a hydro turbine draft tube

Sergey I. Shtork; Ivan V. Litvinov; Evgeny Y. Gorelikov; Andrey S. Mitryakov; Kemal Hanjalic

Abstract

The work reports on experimental study of flow and pressure pulsations in draft-tube of a laboratory air model of a Francis hydro-turbine operating over a broad range of regimes corresponding to different combinations of the runner rotation speed and flowrates. The velocity measurements using a computer-automated laser-Doppler anemometer and the pressure recording by wall-mounted acoustic sensors for a selection of operating conditions reveal different patterns of the swirling flow, with clearly identifiable regimes with the maximum flow pulsations at non-optimal operating conditions. The regimes with distinct precessing vortex cores show notable rearrangement of the velocity fields, accompanied by an increase in the amplitude of the pressure pulsations, as confirmed by the peaks of the spectra of pressure signals from wall-mounted microphones.

Original language	English
Number of pages	1
Publication status	Published - 2018
Event	LXLASER2018: 19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics - Lisbon, Portugal Duration: 16 Jul 2018 → 19 Jul 2018 Conference number: 19 http://www.lisbon-lasersymposium.org/LXLASER2018

Conference

Conference	LXLASER2018: 19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics
Abbreviated title	LXLASER2018
Country/Territory	Portugal
City	Lisbon
Period	16/07/18 → 19/07/18
Internet address	http://www.lisbon-lasersymposium.org/LXLASER2018

Keywords

Automated LDA
Rapid prototyping
Hydro turbine draft tubes
Precessing vortex core (PVC)

Access to Document

Proceedings_LxSymp2018_Final7Final published version, 336 KB

Cite this

@conference{03cd30a3a69d4a289a6bc20687f09412,

title = "LDA analysis of swirling flow in a hydro turbine draft tube",

abstract = "The work reports on experimental study of flow and pressure pulsations in draft-tube of a laboratory air model of a Francis hydro-turbine operating over a broad range of regimes corresponding to different combinations of the runner rotation speed and flowrates. The velocity measurements using a computer-automated laser-Doppler anemometer and the pressure recording by wall-mounted acoustic sensors for a selection of operating conditions reveal different patterns of the swirling flow, with clearly identifiable regimes with the maximum flow pulsations at non-optimal operating conditions. The regimes with distinct precessing vortex cores show notable rearrangement of the velocity fields, accompanied by an increase in the amplitude of the pressure pulsations, as confirmed by the peaks of the spectra of pressure signals from wall-mounted microphones. ",

keywords = "Automated LDA, Rapid prototyping, Hydro turbine draft tubes, Precessing vortex core (PVC)",

author = "Shtork, {Sergey I.} and Litvinov, {Ivan V.} and Gorelikov, {Evgeny Y.} and Mitryakov, {Andrey S.} and Kemal Hanjalic",

year = "2018",

language = "English",

note = "LXLASER2018: 19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics, LXLASER2018 ; Conference date: 16-07-2018 Through 19-07-2018",

url = "http://www.lisbon-lasersymposium.org/LXLASER2018",

}

TY - CONF

T1 - LDA analysis of swirling flow in a hydro turbine draft tube

AU - Shtork, Sergey I.

AU - Litvinov, Ivan V.

AU - Gorelikov, Evgeny Y.

AU - Mitryakov, Andrey S.

AU - Hanjalic, Kemal

N1 - Conference code: 19

PY - 2018

Y1 - 2018

N2 - The work reports on experimental study of flow and pressure pulsations in draft-tube of a laboratory air model of a Francis hydro-turbine operating over a broad range of regimes corresponding to different combinations of the runner rotation speed and flowrates. The velocity measurements using a computer-automated laser-Doppler anemometer and the pressure recording by wall-mounted acoustic sensors for a selection of operating conditions reveal different patterns of the swirling flow, with clearly identifiable regimes with the maximum flow pulsations at non-optimal operating conditions. The regimes with distinct precessing vortex cores show notable rearrangement of the velocity fields, accompanied by an increase in the amplitude of the pressure pulsations, as confirmed by the peaks of the spectra of pressure signals from wall-mounted microphones.

AB - The work reports on experimental study of flow and pressure pulsations in draft-tube of a laboratory air model of a Francis hydro-turbine operating over a broad range of regimes corresponding to different combinations of the runner rotation speed and flowrates. The velocity measurements using a computer-automated laser-Doppler anemometer and the pressure recording by wall-mounted acoustic sensors for a selection of operating conditions reveal different patterns of the swirling flow, with clearly identifiable regimes with the maximum flow pulsations at non-optimal operating conditions. The regimes with distinct precessing vortex cores show notable rearrangement of the velocity fields, accompanied by an increase in the amplitude of the pressure pulsations, as confirmed by the peaks of the spectra of pressure signals from wall-mounted microphones.

KW - Automated LDA

KW - Rapid prototyping

KW - Hydro turbine draft tubes

KW - Precessing vortex core (PVC)

M3 - Abstract

T2 - LXLASER2018: 19th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics

Y2 - 16 July 2018 through 19 July 2018

ER -