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Appl. Sci. 2018, 8(1), 125;

Numerical Assessment of Virtual Control Surfaces for Load Alleviation on Compressor Blades

Chair for Aero Engines, Institute of Aeronautics and Astronautics, Technische Universität Berlin, 10623 Berlin, Germany Marchstraße 12-14, 10587 Berlin, Germany
This paper is an extension of our work presented at the 35th AIAA Applied Aerodynamics Conference, AIAA Aviation Forum 2017 (AIAA 2017-3909).
Author to whom correspondence should be addressed.
Received: 29 October 2017 / Revised: 21 December 2017 / Accepted: 14 January 2018 / Published: 17 January 2018
(This article belongs to the Special Issue Active Flow Control Technologies for Energy and Propulsive Systems)
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Virtual control surfaces for the optimization of steady and unsteady airloads on a compressor cascade are assessed numerically. The effects of mechanical surfaces are realized with plasma actuators, located both on the pressure and on the suction side of the blade trailing edge. Suction side plasma actuation is thought to reproduce the effects of mechanical wing spoilers, whereas pressure side plasma actuation is meant to act as a mechanical Gurney flap. Indeed, actuators are operated to generate an induced velocity field that is opposite relative to the direction of the freestream velocity. As a consequence, controlled recirculating flow areas are generated, which modify the effective mean line shape, as well as the position of the Kutta condition application point—and in turn the developed airloads. Proper triggering of pressure/suction side actuation is found to be effective in altering the blade loading, with effects comparable to those of mechanical control surfaces. Traveling wave mode simulations show that significant reductions in the peaks of the blade pitching moment can be achieved on the whole spectrum of interblade phase angles. It is proved that virtual control surfaces can provide effective load alleviation on the cascade, with potential remarkable reduction of fatigue phenomena. View Full-Text
Keywords: unsteady aerodynamics; adaptive structures; computational aeroelasticity; rotorcraft unsteady aerodynamics; adaptive structures; computational aeroelasticity; rotorcraft

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Motta, V.; Malzacher, L.; Peitsch, D. Numerical Assessment of Virtual Control Surfaces for Load Alleviation on Compressor Blades. Appl. Sci. 2018, 8, 125.

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