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Plasma Sci. Technol. ›› 2018, Vol. 20 ›› Issue (5): 054021.doi: 10.1088/2058-6272/aab5bb


Active control of noise amplification in the flow over a square leading-edge flat plate utilizing DBD plasma actuator

Yadong HUANG (黄亚冬) and Benmou ZHOU (周本谋)   


  1. Science and Technology on Transient Physics Laboratory, Nanjing University of Science and Technology, Nanjing 210094, People?s Republic of China
  • Received:2017-10-30 Published:2018-03-11
  • Supported by:

    This work has been funded by the Specialized Research Fund for the Doctoral Program of Higher Education (Grant No. 20133219110039).


Perturbation is generally considered as the flow noise, and its energy can gain transient growth in the separation bubble. The amplified perturbations may cause unstable Kelvin–Helmohltz vortices which induce the three-dimensional transition. Active control of noise amplification via dielectric barrier discharge plasma actuator in the flow over a square leading-edge flat plate is numerically studied. The actuator is installed near the plate leading-edge where the separation bubble is formed. The maximum energy amplification of perturbations is positively correlated with the separation bubble scale which decreases with the increasing control parameters. As the magnitude of noise amplification is reduced, the laminar-turbulent transition is successfully suppressed.

Key words: separation bubble, noise amplification, DBD plasma actuator, transition suppression