Phase Synchronization of Vortex Shedding from Two Circular Cylinders Using Plasma Actuators

Asghar, Asad; Jumper, Eric J.

doi:10.2514/1.34580

Cited by 9 publications

(2 citation statements)

References 31 publications

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“…For the general control problem given by (11)-(12), we use a strictly proper time-series controller of order n c , such that the control u(k) is given by (13) where, for all , are given by the adaptive law presented below. The control can be expressed as (14) where (15) is the controller parameter matrix, and the regressor vector ϕ'(k) (and ϕ(k)) is given by (16) For positive integer µ, we define the extended control vector U'(k) (and U(k)) by (17) where…”

Section: Retrospective Cost Adaptive Algorithmmentioning

confidence: 99%

“…Some examples are tonal and/or broadband noise reduction in cavity flow, jet noise control, and mitigation of the influence of disturbance on lifting surface. In addition, the DBD actuator providing large bandwidth without mechanical complexity, which helps address multitime scale physics 12 and manipulation of unsteady flow structures 13 .…”

Section: Introductionmentioning

confidence: 99%

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Nonlinearity Identification and Flow Control for Low-Reynolds Number Aerodynamics with Unsteady Free-Stream

Cho

Shyy

2012

50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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Effective control of unsteady aerodynamics depends on satisfactory treatment of fluid physics along with robust control techniques. For low-Reynolds number flyers operating at a chord Reynolds number of 10 4 or lower (hummingbird-size or smaller), due to their small size, light weight and low flight speed, it is critical for the control scheme to be effective in unsteady free-stream. In this study, a flow control framework based on linear system parameters, a penalty-based adaptive law, and dielectric barrier discharge (DBD) actuator is applied for a stationary wing at the chord Reynolds number of 1000. Special focus is on the nonlinearity associated with unsteady flow separation subject to substantial unsteady freestream. The nonlinearity is reflected by the actuator saturation due to the breakdown voltage of the DBD actuator, vortex evolution/shedding, and the interaction between the separated flow and the free-stream. Its implications including fluctuations in lift and drag are investigated. The insight gained enables us to better manage parametric changes due to the unsteady flow environment, resulting in more effective flow control.

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