TY - JOUR

T1 - Manipulation of vortex core characteristics in an expanding swirling flow by multijet injection

AU - Suslov, Daniil A.

AU - Skripkin, Sergey G.

N1 - Suslov, D. A. Manipulation of vortex core characteristics in an expanding swirling flow by multijet injection / D. A. Suslov, S. G. Skripkin // Physics of Fluids. – 2026. – Vol. 38, No. 2. – P. 025150. – DOI 10.1063/5.0314206. – EDN OQCFOY. The study was supported by the Russian Science Foundation, Grant No. 25-79-30002 (https://rscf.ru/en/project/25-79-30002/). The experimental facilities were provided under state contract with IT SB RAS, Contract No.121031800229-1.

PY - 2026/2/18

Y1 - 2026/2/18

N2 - The precessing vortex core (PVC) is a fundamental global instability that dictates the dominant unsteady dynamics and energy transfer processes in swirling flows. This study presents a comprehensive experimental investigation of the spatial transformation of the PVC in an expanding swirling flow subjected to multi-jet injection. Using time-resolved particle image velocimetry synchronized with pressure measurements, we systematically quantify changes in key vortex parameters: precession radius, core diameter, helical pitch, and circulation with varying injection angles (axial, radial, and combined). The results demonstrate a profound spatial reorganization: a systematic contraction of the precession radius, a significant axial stretching reflected in an increased helical pitch, and a monotonic reduction in vortex circulation. These spatial modifications are successfully consolidated using the momentum flux coefficient, revealing clear scaling laws. This work establishes a direct causal link between the controlled manipulation of the PVC's spatial topology and the attenuation of its dynamic effects, providing a foundational insight for developing efficient control strategies in vortex-dominated flows.

AB - The precessing vortex core (PVC) is a fundamental global instability that dictates the dominant unsteady dynamics and energy transfer processes in swirling flows. This study presents a comprehensive experimental investigation of the spatial transformation of the PVC in an expanding swirling flow subjected to multi-jet injection. Using time-resolved particle image velocimetry synchronized with pressure measurements, we systematically quantify changes in key vortex parameters: precession radius, core diameter, helical pitch, and circulation with varying injection angles (axial, radial, and combined). The results demonstrate a profound spatial reorganization: a systematic contraction of the precession radius, a significant axial stretching reflected in an increased helical pitch, and a monotonic reduction in vortex circulation. These spatial modifications are successfully consolidated using the momentum flux coefficient, revealing clear scaling laws. This work establishes a direct causal link between the controlled manipulation of the PVC's spatial topology and the attenuation of its dynamic effects, providing a foundational insight for developing efficient control strategies in vortex-dominated flows.

UR - https://www.mendeley.com/catalogue/4d7aa494-995e-3070-90e3-d2e8a5c7d0ee/

UR - https://www.scopus.com/pages/publications/105030612650

UR - https://elibrary.ru/item.asp?id=90104840

U2 - 10.1063/5.0314206

DO - 10.1063/5.0314206

M3 - Article

VL - 38

JO - Physics of Fluids

JF - Physics of Fluids

SN - 1070-6631

IS - 2

M1 - 025150

ER -