Download Active Flow Control II: Papers Contributed to the Conference by George T. K. Woo, Ari Glezer (auth.), Rudibert King (eds.) PDF
By George T. K. Woo, Ari Glezer (auth.), Rudibert King (eds.)
This quantity offers an up-to-date and good balanced mixture of theoretical and experimental state of the art result of lively move regulate. It combines new advancements optimum open- and closed-loop regulate and version relief for keep an eye on. Numerical and experimental functions are thought of from aeronautics, ground-based autos, turbo-machinery and combustors. The contributions to this booklet have been provided on the convention lively stream regulate II, held may perhaps 26-28, 2010, on the Technische Universität Berlin, Germany.
Read Online 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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Extra info for Active Flow Control II: Papers Contributed to the Conference ”Active Flow Control II 2010”, Berlin, Germany, May 26 to 28, 2010
These data indicate that with increased pulse durations, the trapping of the dynamic vortices are momentarily extended thus increases the transitory lift above baseline. Similar, but less dramatic effects on the pitching moment are observed. However, with increased size and strength of the dynamic stall vortices (as a result of longer burst actuation), their shedding at the termination of actuation may induce significant and abrupt CL and CM,c/4 fluctuations. 4 Conclusions Transitory control of the flow over a stalled, 2-D airfoil is investigated in wind tunnel experiments using high impulse and short duration actuation jets that are on time scales that are at least an order of magnitude shorter than the convective time scale of the flow.
Control of flow separation by sound. : Aerodynamic Flow Control of a Thick Airfoil using the Synthetic Jet Actuators. : Aerodynamic Flow Control over an Unconventional Airfoil Using Synthetic Jet Actuators. : Controlled Transients of Flow Reattachment over Stalled Airfoils. : Flow Transients Induced on a 2D Airfoil by Pulse-Modulated Actuation. : Transient Separation Control Using Pulse-Combustion Actuation. : Progress in Analysis and Prediction of Dynamic Stall. : Combustion-Driven Jet Actuators for Flow Control.
Williams et al. The challenge in using AFC to enhance aircraft maneuverability comes from the effects of unsteady aerodynamics and the substantial time delays in the flow response to actuation. A quasi-steady control approach only works at very slow maneuvering speeds, because the static response maps become highly inaccurate in dynamic situations for both the aerodynamic loads and the response to actuation.  on a 3D wing. Relaxation times of the flow from the actuator’s initial transient to the final steady state were found to be on the order of O(5-10 t+), where t+ is the convective time scale, which is time normalized by the external flow speed, U, and the chord length of the wing or flap model, c.