Abstract The post-stall flow control using compliant flags of varying thickness and length, placed upstream a NACA0012 airfoil, was shown to be possible at an airfoil chord Reynolds number 100,000. flag wakes produced substantial increase in the stall angle maximum lift coefficient optimal cross-stream locations from wake centerline. Oscillating could generate periodic with better spanwise cohe...

Flatback airfoils are with a blunt trailing edge. They currently commonly used in the inboard part of large wind turbine blades, as they offer number aerodynamic, structural, and aeroelastic benefits. However, flow past them at high angles attack (AoA) has received relatively little attention until now. This is important because usually operate AoA Wind Turbine blades. The present investigation...

The ability to control the flow of water around the body dictates the performance of marine mammals in the aquatic environment. Morphological specializations of marine mammals afford mechanisms for passive flow control. Aside from the design of the body, which minimizes drag, the morphology of the appendages provides hydrodynamic advantages with respect to drag, lift, thrust, and stall. The flu...

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The research outlined in our two parts abstract is carried as part of a MURI research program whose purpose is to use feedback flow control to extend the range of aspect ratios, Reynolds numbers and angles of attack (AOA) for which high lift and high maneuverability can be achieved. Our work is motivated by the remarkable aerodynamic performance of bio-fliers wings, enabled by their stable lead...

Axial compressors with variable stator vanes require annular gaps and radial from the endwalls for smooth adjustment, which induces complex secondary flows such as penny leakage vortex tip vortex, leading to a negative impact on aerodynamic performance. To better understand these mechanisms, numerical investigations were conducted four different clearance configurations. The results show that m...

This paper examines feasibility and performance issues in using Control Moment Gyroscopes (CMGs) to control the attitude of a fixed-wing aircraft. The paper describes a control system structure that permits allocating control authority and bandwidth between a CMG system and conventional aerodynamic control surfaces to stabilize a vehicle with neutral aerodynamic stability. A simulation study ex...

Conceptual wing design analysis methods are combined with numerical optimization to find minimum drag wings subject to constraints on lift, weight, pitching moment, and stall speed. Minimum drag tip extensions and winglets are compared using nonlinear optimization. The minimum drag trapezoidal tip device depends on the ratio of the maneuver lift coefficient to the cruise lift coefficient, altho...

The blade pitch of a Vertical Axis Wind Turbine can have profound impact on the aerodynamic loading experienced by turbine. This in turn impacts structural loads and performance machine. In order to characterize effects changing pitch, studies are conducted with fixed offsets from neutral position open jet wind tunnel TU Delft. Measurements strain gages bonded turbine struts used estimate norma...