Active Flow Control II: Papers Contributed to the Conference by George T. K. Woo, Ari Glezer (auth.), Rudibert King (eds.)

By George T. K. Woo, Ari Glezer (auth.), Rudibert King (eds.)

This quantity offers an up-to-date and good balanced mix of theoretical and experimental state of the art result of energetic stream keep watch over. It combines new advancements optimum open- and closed-loop keep an eye on and version relief for regulate. Numerical and experimental functions are thought of from aeronautics, ground-based automobiles, turbo-machinery and combustors. The contributions to this ebook have been offered on the convention energetic circulation regulate II, held could 26-28, 2010, on the Technische Universität Berlin, Germany.

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Additional info for Active Flow Control II: Papers Contributed to the Conference ”Active Flow Control II 2010”, Berlin, Germany, May 26 to 28, 2010

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The gray line is the lift with continuous actuation. 2 Description of Actuated Flow – Static Map The static lift response of the wing to continuously pulsed (steady-state) actuation is shown in Fig. 4. The data were found to scale well when the lift coefficient was plotted against the square-root of the actuator supply pressure coefficient. 5ρU 2 supply pressure and p∞ is the freestream static pressure. The square-root dependence on Cpj is modeled as a static input nonlinearity in the plant model.

The Bode plot of all 33 models and the nominal model shown in figure 7 reveals a small variation in the frequency response of the models. The deviation from the nominal model's frequency response is described by a multiplicative uncertainty Π I : G p ( s) = Gn ( s)(1 + wI ( s )Δ I ( s)), Δ I ( jω ) ≤ 1, ∀ω , wherein ΔI(s) denotes a normalized uncertainty with a frequency dependent weight wI(s) comprising all identified transfer functions. Fig. 2 Mixed Sensitivity Method of Controller Design The mixed-sensitivity method of loop-shaping is used to tune the controller performance, so that robust stability and performance are guaranteed for all models identified over the range of flow speeds from 5 m/s to 9 m/s.

Transitory Control of a Pitching Airfoil using Pulse Combustion Actuation. : Transitory Separation Control over a Stalled Airfoil. : Transient Control of Separating Flow over a Dynamically-Pitching Airfoil. : Post Stall Flow Control on an Airfoil by Local Unsteady Forcing. JFM 371, 21–58 (1998) Unsteady Lift Suppression with a Robust Closed Loop Controller David Williams, Wesley Kerstens, Jens Pfeiffer, Rudibert King, and Tim Colonius* Summary. The ability to control lift in unsteady flows using active flow control is examined experimentally with a three-dimensional, low-aspect-ratio wing and pulsed-blowing actuators as the test article.

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