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Experimental study on flow and turbulence characteristics of jet impinging on cylinder using three‑dimensional Lagrangian particle tracking velocimetry

Kim, Mirae and Schanz, Daniel and Novara, Matteo and Godbersen, Philipp and Yeom, Eunseop and Schröder, Andreas (2023) Experimental study on flow and turbulence characteristics of jet impinging on cylinder using three‑dimensional Lagrangian particle tracking velocimetry. Scientific Reports, 13 (7), pp. 1-23. Nature Publishing Group. doi: 10.1038/s41598-023-37970-9. ISSN 2045-2322.

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Official URL: https://doi.org/10.1038/s41598-023-37970-9


When a round jet impinges on a convex cylindrical surface, complex three-dimensional (3D) flow structures occur, accompanied by the Coanda effect. To characterize the flow and turbulence properties of the general system, ensemble averages of 3D Lagrangian particle tracking velocimetry measurements were taken. The radial bin-averaging method was used in post-processing the tracked particles and corresponding instantaneous velocity vectors to generate appropriate ensemble-averaged statistics. Two impinging angles were selected, and at a fixed Reynolds number, the ensemble-averaged volumetric velocity field and turbulent stress tensor components were measured. The flow and turbulence characteristics of the impinging jet on the cylinder were notably different based on the impinging angle, especially in the downstream region. Surprisingly, the attached wall jet with a half-elliptic shape was abruptly thickened in the wall-normal direction, similar to the axis switching phenomenon observed in elliptic jets in the case of oblique impingement. In the jet-impinging region, the flow spread in all directions with high mean vorticity values. With the development of a 3D curved wall jet, both the Coanda effect and centrifugal force played a significant role in the flow behavior. A notable feature of the self-preserving region was the similarity of mean velocity profiles with scaling by the maximum velocity and the jet half-width for both impinging angle cases. Local isotropy of turbulent normal stresses was observed in this region, supporting the existence of self-preservation in the 3D curved wall jet. The volumetric ensemble-averaged Reynolds stress tensor revealed strong inhomogeneous turbulence in the boundary layer region and the curvature effect on the Reynolds shear stress in the free shear layer.

Item URL in elib:https://elib.dlr.de/196371/
Document Type:Article
Additional Information:https://www.nature.com/articles/s41598-023-37970-9; Article number: 10929 (2023)
Title:Experimental study on flow and turbulence characteristics of jet impinging on cylinder using three‑dimensional Lagrangian particle tracking velocimetry
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Schanz, DanielUNSPECIFIEDhttps://orcid.org/0000-0003-1400-4224UNSPECIFIED
Novara, MatteoUNSPECIFIEDhttps://orcid.org/0000-0002-8975-0419UNSPECIFIED
Godbersen, PhilippUNSPECIFIEDhttps://orcid.org/0000-0002-0917-4897UNSPECIFIED
Schröder, AndreasUNSPECIFIEDhttps://orcid.org/0000-0002-6971-9262140472831
Date:6 July 2023
Journal or Publication Title:Scientific Reports
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 1-23
EditorsEmailEditor's ORCID iDORCID Put Code
Publisher:Nature Publishing Group
Series Name:natureportfolio
Keywords:Impinging Jet, Lagrangian Particle Tracking, Turbulence, Coanda effect
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Efficient Vehicle
DLR - Research area:Aeronautics
DLR - Program:L EV - Efficient Vehicle
DLR - Research theme (Project):L - Virtual Aircraft and  Validation
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Micknaus, Ilka
Deposited On:15 Aug 2023 14:08
Last Modified:15 Aug 2023 14:08

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