TY - JOUR

T1 - Active vortex control downstream the turbine runner in the Francis hydro turbine model

AU - Suslov, D. A.

AU - Skripkin, S. G.

AU - Tsoy, M. A.

AU - Gorelikov, E. Yu

AU - Shtork, S. I.

N1 - Research for flow control methods was performed in the framework of a state assignment for IT SB RAS with a support of junior scientists project in IT SB RAS; the velocity profile data set was accumulated for regression analysis and using the facilities of LabPET (from NSU) and this work was supported by the RSF grant (Project No. 21-79-10080).

PY - 2025/3/11

Y1 - 2025/3/11

N2 - This paper presents the development of active control methods for vortex phenomena in hydro turbines. The flow pattern downstream of a simplified turbine runner was studied under conditions typical of a hydro turbine operating at partial load, which are prone to generating large-scale vortex structures and inducing powerful pressure pulsations. Active control was achieved through the injection of additional air jets into the center of the runner cone. The results of experiments covering velocity distributions, velocity pulsations, and pressure pulsations following the injection of jets are presented. Control jets, regardless of their orientation, successfully suppress pressure pulsations. However, jets oriented radially provide the most effective suppression of vortices and reduce the total flow swirl in the draft tube. The pattern of jet supply directly affects the formation of a recirculation zone downstream of the runner. Experimental data on optimal injection align with previous theoretical estimates based on flow linear stability analysis.

AB - This paper presents the development of active control methods for vortex phenomena in hydro turbines. The flow pattern downstream of a simplified turbine runner was studied under conditions typical of a hydro turbine operating at partial load, which are prone to generating large-scale vortex structures and inducing powerful pressure pulsations. Active control was achieved through the injection of additional air jets into the center of the runner cone. The results of experiments covering velocity distributions, velocity pulsations, and pressure pulsations following the injection of jets are presented. Control jets, regardless of their orientation, successfully suppress pressure pulsations. However, jets oriented radially provide the most effective suppression of vortices and reduce the total flow swirl in the draft tube. The pattern of jet supply directly affects the formation of a recirculation zone downstream of the runner. Experimental data on optimal injection align with previous theoretical estimates based on flow linear stability analysis.

KW - LDA

KW - acoustic sensor

KW - axial jet

KW - draft tube in a hydro turbine

KW - precessing vortex core

KW - vortex structure control

UR - https://www.mendeley.com/catalogue/d462b54e-d473-34f0-a648-398fc0c24ad2/

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-105000054573&origin=inward&txGid=cace38895548977ec3146b58a5f7e8e6

U2 - 10.1134/S0869864324040206

DO - 10.1134/S0869864324040206

M3 - Article

VL - 31

SP - 819

EP - 830

JO - Thermophysics and Aeromechanics

JF - Thermophysics and Aeromechanics

SN - 0869-8643

IS - 4

ER -