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Plasma virtual-roughness elements for cross-flow instability control

Choi, Kwing-So; Kim, Jung-Hoon

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Authors

KWING-SO CHOI kwing-so.choi@nottingham.ac.uk
Professor of Fluid Mechanics

Jung-Hoon Kim



Abstract

Recent experiments and numerical simulations demonstrated that discrete roughness elements can be used to control cross-flow instability over a swept wing. Here, the application of this passive technique requires a row of thin cylindrical elements of a few microns high immediately downstream of the leading edge to excite the subcritical modes of cross-flow instability. By properly choosing the spanwise spacing of these roughness elements, one can suppress the growth of most unstable modes, thereby delay transition. However, this passive technique of controlling cross-flow instability is very sensitive to the size (diameter and height), shape and location of discrete roughness. To mimic the discrete roughness elements and to be able to adjust the roughness parameters dynamically, virtual roughness elements based on dielectric-barrier-discharge plasma actuators have been developed and tested. In this paper, we show the plasma-induced flow field of several different prototype virtual-roughness elements for cross-flow instability control, by describing the mechanisms of vortex generation from the virtual roughness elements through an interaction with the incoming laminar boundary layer.

Citation

Choi, K.-S., & Kim, J.-H. (2018). Plasma virtual-roughness elements for cross-flow instability control. Experiments in Fluids, 59, Article 159. https://doi.org/10.1007/s00348-018-2609-x

Journal Article Type Article
Acceptance Date Sep 1, 2018
Online Publication Date Oct 1, 2018
Publication Date Oct 1, 2018
Deposit Date Sep 24, 2018
Publicly Available Date Oct 2, 2019
Journal Experiments in fluids
Print ISSN 0723-4864
Electronic ISSN 1432-1114
Publisher Springer Publishing Company
Peer Reviewed Peer Reviewed
Volume 59
Article Number 159
DOI https://doi.org/10.1007/s00348-018-2609-x
Keywords Plasma actuators; Cross-flow instability; Boundary layers; Roughness elements
Public URL https://nottingham-repository.worktribe.com/output/1128384
Publisher URL http://link-springer-com-443.webvpn.jxutcm.edu.cn/article/10.1007/s00348-018-2609-x
Contract Date Sep 24, 2018

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