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Review of flow control mechanisms of leading-edge vortices
Vortex control concepts employed for slender and nonslender delta wings were reviewed. Important aspects of flow control include flow separation, vortex formation, flow reattachment, vortex breakdown, and vortex instabilities....
Nearest Neighbor Decoding and Pilot-AidedChannel Estimation for Fading Channels
We study the information rates of noncoherent, stationary, Gaussian, and multiple-input multiple-output (MIMO) flat-fading channels that are achievable with nearest neighbor decoding and pilot-aided channel estimation. In...
Review of flow control mechanisms of leading-edge vortices
Vortex control concepts employed for slender and nonslender delta wings were reviewed. Important aspects of flow control include flow separation, vortex formation, flow reattachment, vortex breakdown, and vortex instabilities....
Passive control of roll oscillations of low-aspect-ratio wings using bleed
A passive flow control method, which uses bleed from a slot near the wing tip, has been shown to attenuate self-excited roll oscillations of a low-aspect-ratio (AR = 2) rectangular flat plate wing. This method was found to be...
Novel Approach to Leading-Edge Vortex Suppression
A novel approach to reduce the peak lift and pitching moment on a plunging airfoil is investigated through force, moment, and velocity measurements. This approach, unlike previous investigations of delayed flow separation and...
Unsteady characteristics of inlet vortices
An experimental study of the unsteady characteristics of inlet vortices has been conducted using a high-frame rate digital particle image velocimetry system. The results revealed the formation of a pair of counter-rotating inlet...
Unsteady characteristics of inlet vortices
An experimental study of the unsteady characteristics of inlet vortices has been conducted using a high-frame rate digital particle image velocimetry system. The results revealed the formation of a pair of counter-rotating inlet...
Novel Approach to Leading-Edge Vortex Suppression
A novel approach to reduce the peak lift and pitching moment on a plunging airfoil is investigated through force, moment, and velocity measurements. This approach, unlike previous investigations of delayed flow separation and...
Nearest Neighbor Decoding and Pilot-AidedChannel Estimation for Fading Channels
We study the information rates of noncoherent, stationary, Gaussian, and multiple-input multiple-output (MIMO) flat-fading channels that are achievable with nearest neighbor decoding and pilot-aided channel estimation. In...
Volumetric measurements and simulations of the vortex structures generated by low aspect ratio plunging wings
Volumetric three-component velocimetry measurements have been performed on low aspect ratio wings undergoing a small amplitude pure plunging motion. This study focuses on the vortex flows generated by rectangular and elliptical...
Attenuation of self-excited roll oscillations of low-aspect-ratio wings by using acoustic forcing
Attenuation of self-excited roll oscillations of low-aspect-ratio wings using acoustic excitation was studied in a wind tunnel. For a rectangular flat-plate wing with an aspect ratio of 2, roll oscillations can be completely...
Three-dimensionality of leading-edge vortices on high aspect ratio plunging wings
To investigate the effect of sweep on the leading-edge vortex of high aspect ratio plunging wings, this article presents force, bending moment, and volumetric velocity measurements for high aspect ratio AR = 10 wings with sweep...
Three-dimensionality of leading-edge vortices on high aspect ratio plunging wings
To investigate the effect of sweep on the leading-edge vortex of high aspect ratio plunging wings, this article presents force, bending moment, and volumetric velocity measurements for high aspect ratio AR = 10 wings with sweep...
Bifurcating flows of plunging airfoils at high Strouhal numbers
Force and particle image velocimetry measurements were conducted on a NACA 0012 aerofoil undergoing small-amplitude high-frequency plunging oscillation at low Reynolds numbers and angles of attack in the range...
Frequency lock-in phenomenon for self-sustained roll oscillations of rectangular wings undergoing a forced periodic pitching motion
The free-to-roll behaviour of rigid and membrane rectangular wings with an aspect ratio of two was studied in wind tunnel experiments conducted at a chord Reynolds number of Re = 46 000. Self-excited roll oscillations resulting...
Control of low Reynolds number flows by means of fluid–structure interactions
There is great interest in small aircraft known as Micro Air Vehicles and mini Unmanned Air Vehicles due to the wide range of possible applications. This article reviews recent work that aims to exploit the flexibility of the...
Aerodynamics of biplane and tandem wings at low Reynolds numbers
Experiments were performed to investigate the aerodynamic characteristics of two-wing configurations at a low Reynolds number of 100,000. The wing models were rectangular flat plates with a semi-aspect ratio of two. The stagger...
Unsteady Aerodynamics of Nonslender Delta Wings
Unsteady aerodynamics of nonslender delta wings, covering topics of shear layer instabilities, structure of nonslender vortices, breakdown, maneuvering wings, and fluid/structure interactions, are reviewed in this paper....
Control of low Reynolds number flows by means of fluid–structure interactions
There is great interest in small aircraft known as Micro Air Vehicles and mini Unmanned Air Vehicles due to the wide range of possible applications. This article reviews recent work that aims to exploit the flexibility of the...
Passive control of roll oscillations of low-aspect-ratio wings using bleed
A passive flow control method, which uses bleed from a slot near the wing tip, has been shown to attenuate self-excited roll oscillations of a low-aspect-ratio (AR = 2) rectangular flat plate wing. This method was found to be...
Experiments on Jet/Vortex Interaction
An experimental study was performed to evaluate the effect of a cold jet on a single trailing vortex. Flow visualization and particle image velocimetry (PIV) measurements were conducted in wind and water tunnels. The main...
Multi-Class Cost-Constrained Random Coding for Correlated Sources over the Multiple-Access Channel.
This paper studies a generalized version of multi-class cost-constrained random-coding ensemble with multiple auxiliary costs for the transmission of N correlated sources over an N-user multiple-access channel. For...
Unsteady Aerodynamics of Nonslender Delta Wings
Unsteady aerodynamics of nonslender delta wings, covering topics of shear layer instabilities, structure of nonslender vortices, breakdown, maneuvering wings, and fluid/structure interactions, are reviewed in this paper....
Attenuation of self-excited roll oscillations of low-aspect-ratio wings by using acoustic forcing
Attenuation of self-excited roll oscillations of low-aspect-ratio wings using acoustic excitation was studied in a wind tunnel. For a rectangular flat-plate wing with an aspect ratio of 2, roll oscillations can be completely...
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