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

ISBN-10: 3642117341

ISBN-13: 9783642117343

This quantity provides an up-to-date and good balanced blend of theoretical and experimental state of the art result of energetic stream regulate. It combines new advancements optimum open- and closed-loop regulate and version relief for regulate. Numerical and experimental purposes are thought of from aeronautics, ground-based autos, turbo-machinery and combustors. The contributions to this e-book have been offered on the convention energetic stream regulate II, held could 26-28, 2010, on the Technische Universität Berlin, Germany.

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

Example text

Hence the plant with input u = Cpj and output y = CL can be modeled as a nonlinear system consisting of a linear dynamic part Gp(s) and a static input nonlinearity f(u) = Cpj1/2. Its inverse Kff (s) qS Nonlinear Plant ÷ Lref F(s) r = CL,ref - y = CL f(u*)-1 K(s) u* f(u) u = Cpj Gp(s) v qS Fig. 5 Control loop architecture used for suppression of the oscillating lift L × Unsteady Lift Suppression with a Robust Closed Loop Controller 25 is used as a pre-compensator f(u*)-1= u*2, resulting in a plant which is linear with respect to u* and y.

A similar frequency dependence is also reflected for Δ C¯D . 5 could be detected as well, but it is shifted to slightly higher momentum coefficients. 5 in comparison to other frequencies, as presented in Fig. 12. For small momentum coefficients the influence of the frequency is not that pronounced. 14 cμ [%] Fig. 05 c [%] L/D [-] L/D [-] Fig. 08% 4 6 20 -6 -4 -2 0 2 4 6 α [°] Fig. 13 Benefit of L/D ratio for a flap angle of δ f = 16◦ (left) and δ f = 21◦ (right) is visible. 1%. 1% L/D stagnates or decreases slightly.

Com c Springer-Verlag Berlin Heidelberg 2010 46 B. G¨unther, A. Carnarius, and F. Thiele blowing and/or suction has proved to be particularly suitable for delaying separation on the flap of an airfoil and can thus be seen as a mature flow control technique. In present studies, periodic control is applied to an HQ41-profile, which is nearly identical to the HQ17, except for the camber flap. This work is part of a collaborative project, including numerical as well as experimental investigations, which aims at designing an efficient flow control for a configuration with practical relevance and at demonstrating the usability in a free-flight experiment at the end of the project.

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Active Flow Control II: Papers Contributed to the Conference ”Active Flow Control II 2010”, Berlin, Germany, May 26 to 28, 2010 by George T. K. Woo, Ari Glezer (auth.), Rudibert King (eds.)


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