Plasma-based aerodynamic actuators can modify a flow field without the need for moving control surfaces or a source of pressurized air. Actuator power consumption and thrust production were measured for driving frequencies between 1 and 18 kHz, and for driving voltages of 6 and 9 kV peak to peak. The actuator consumed between 3 and 22 W, and produced thrust levels between 0.05 and 0.2 mN per me...

Modeling and control for axial ow compression systems have received great attention in recent years. The objectives are to suppress rotating stall and surge, to extend the stable operating range of the compressor system, and to enlarge domains of attraction of stable equilibria using feedback control methods. The success of this research eld will signiicantly improve compressor performance and ...

Ice accretion is a common issue on aircraft flying in cold climate conditions. The ice accumulation surfaces disturbs the adjacent airflow field, increases drag, and significantly reduces aircraft’s aerodynamic performance. It also weight of causes failure critical components some situations, leading to premature stall loss control lift. With this mind, several authors have begun study thermal ...

This paper analyzes the nonlinear phenomenon of rotating stall via the methods of projection [Elementary Stability and Bifurcation Theory, G. Iooss and D. D. Joseph, Springer-Verlag, 1980] and Lyapunov [J.-H. Fu, Math. Control Signal Systems, 7, 255278, 1994]. A compressor model of Moore and Greitzer is adopted in which rotating stall dynamics are associated with Hopf bifurcations. Local stabil...

Every airplane has an associated external flow field that is extraordinarily rich in terms of its flow physics. It is intuitively obvious that the shape and configuration of the airplane influences the external flow physics, and the nature of the flow field influences the aerodynamic performance. An airplane is designed to perform optimally under certain operating conditions. Its aerodynamic pe...

In this paper we give insight into characteristics of a 1.5-stage transonic axial compressor rig with focus on surge during stalled operating point. The new at TU Darmstadt is representative for the front stage an industrial gas turbine. Transient throttling maneuvers were conducted multiple points first test campaign TCD 2 (Transonic Compressor 2), providing extensive set unsteady structural a...

Accurate simulations of the aerodynamic performance of vertical-axis wind turbines pose a significant challenge for computational fluid dynamics methods. The aerodynamic interaction between the blades of the rotor and the wake that is produced by the blades requires a high-fidelity representation of the convection of vorticity within the wake. In addition, the cyclicmotion of the blades induces...

Aerodynamic, load, flow-visualization, and inflow measurements have been made on a 10-m, three-bladed, downwind, horizontal-axis wind turbine ( HAWT). A video camera mounted on the rotor was used to record night­ time and daytime video images of tufts attached to the low-pressure side of a constant-chord, zero-twist blade. Load measurements were made using strain gages mounted at every 10% of t...

Abstract With the purpose of investigating effects geometry parameters CFJ (Coflow jet) device on aerodynamic characteristics supercritical bacj airfoil used by a STOL transport, we have carried out computational analysis with different values injection slot size and location under low-speed condition. The results show that lift coefficient decreases gradually decreasing stall angle, when is in...