Feedback control of a turbulent bluff body wake for efficient drag reduction

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• Mr. Rowan Brackston, Imperial College, London
• Friday 17 March 2017, 13:00-14:00
• JDB Seminar Room, CUED.

If you have a question about this talk, please contact Akshath Sharma.

Many road vehicles such as cars and lorries are not shaped in an aerodynamically efficient manner due to aesthetic, practical and legal constraints. Such vehicles are often classified as bluff bodies, and consequently have a large three-dimensional wake which contributes significantly to the aerodynamic drag on these vehicles. While many passive and active methods exist to reduce the drag of 3D bluff bodies, they generally involve either large geometric changes or high energy consumption. An alternative method involves the use of feedback control and small actuators to efficiently regulate key features of the wake. strategies that are experimentally implemented on a high Reynolds number bluff body wake. This first involves an assessment of the wake observability to determine which features of the wake may be robustly measured from body mounted pressure data alone. A second stage is the development of stochastic models that describe key features of the wake and provide insight for feedback control design. These feedback controllers are then implemented, demonstrating that efficient drag reduction is possible, but that the control can be challenged by fundamental limitations.

In this talk we will discuss the development of feedback control

This talk is part of the Fluids Group Seminar (CUED) series.

This talk is included in these lists:

• Acoustics Lab Seminars
• Engineering Department Acoustics/Combustion Student seminars
• Fluids Group Seminar (CUED)
• JDB Seminar Room, CUED

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