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.
Read or Download Active Flow Control II: Papers Contributed to the Conference ”Active Flow Control II 2010”, Berlin, Germany, May 26 to 28, 2010 PDF
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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
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.