Closed-Loop Control of an Unstable Open Cavity

Sipp, Denis; Barbagallo, Alexandre; Schmid, Peter

doi:10.1007/978-3-642-11735-0_18

Cited by 2 publications

(2 citation statements)

References 24 publications

(2 reference statements)

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“…The variable is either directly computable from sensor data, such as local pressure or drag measurement, or obtained by combining sensor data and a model. This model can be simple ( [1] recover recirculation length via its correlation to pressure fluctuations) or complicated ( [14] recovers an approximation of the flow state through Kalman filtering). In the case of the backward-facing step, sensors are almost always pressure sensors, and the control variable is usually the recirculation bubble length.…”

Section: Introductionmentioning

confidence: 99%

Control of the separated flow downstream of a backward-facing step using visual feedback

Gautier¹,

Aider²

2013

Proc. R. Soc. A.

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The separated flow downstream of a backwardfacing step is controlled using visual information for feedback. This is done when looking at the flow from two vantage points. Flow velocity fields are computed in real time and used to yield inputs to a control loop. This approach to flow control is shown to be able to control the detached flow in the same way as has been done before by using the area of the recirculation region downstream of the step as the input for a gradient descent optimization scheme. Visual feedback using real-time computations of two-dimensional velocity fields also allows for novel inputs in the feedback scheme. As a proof of concept, the spatially averaged value of the swirling strength λ Ci is successfully used as the input for an automatically tuned proportional-integral-derivative controller.

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“…The parameter should be either directly computable from sensor data, such as local pressure or drag measurement, or obtained by combining sensor data and a model. The model for closed-loop actuation can be simple ( [16] recover recirculation length via its correlation to pressure fluctuations) or complicated ( [17] recovers an approximation of the flow state through Kalman filtering). In the case of the BFS flow, sensors are most often pressure or skin friction sensors, and the control variable is usually the recirculation length X r (see figure 1a).…”

Section: Introductionmentioning

confidence: 99%

Upstream open loop control of the recirculation area downstream of a backward-facing step

Gautier

Aider

2014

Comptes Rendus Mécanique

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The flow downstream a backward-facing step is controlled using a pulsed jet placed upstream of the step edge. Experimental velocity fields are computed and used to the recirculation area quantify. The effects of jet amplitude, frequency and duty cycle on this recirculation area are investigated for two Reynolds numbers (Re h = 2070 and Re h = 2900). The results of this experimental study demonstrate that upstream actuation can be as efficient as actuation at the step edge when exciting the shear layer at its natural frequency. Moreover it is shown that it is possible to minimize both jet amplitude and duty cycle and still achieve optimal efficiency. With minimal amplitude and a duty-cycle as low as 10% the recirculation area is nearly canceled.

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Closed-Loop Control of an Unstable Open Cavity

Cited by 2 publications

References 24 publications

Control of the separated flow downstream of a backward-facing step using visual feedback

Upstream open loop control of the recirculation area downstream of a backward-facing step

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