Proceedings ArticleDOI
Wing-tip-to-wing-tip aerodynamic interference
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In this paper, the aerodynamic interaction of finite wings flying in very close proximity is investigated experimentally, and the results indicate that vortex lines "jump" or reconnect from one wing tip to the next, even in cases of some physical separation.Abstract:
The aerodynamic interaction of finite wings flying in very close proximity is investigated experimentally. Docked wings are also examined. Tests were carried out in a water tunnel and Particle Image Velocimetry (PIV) was employed to generate velocity data along Trefftz planes. The results indicate that vortex lines “jump”, or reconnect from one wing tip to the next, even in cases of some physical separation. These data can be used to calculate lift and drag and our calculations indicate significant reductions in drag.read more
Citations
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Journal ArticleDOI
Simulation of wake vortex effects for UAVs in close formation flight
TL;DR: In this paper, a wake vortex model has been developed and successfully integrated within a Matlab/Simulink simulation environment to support studies of aerodynamic interaction between multiple air vehicles, and straightforward enough to be used within real time or near real time air-to-air simulations.
Proceedings ArticleDOI
Experimental Determination of Lift and Lift Distributions for Wings In Formation Flight
TL;DR: In this paper, the authors used a flow measurement probe to determine vortex strength and circulation distribution for two wings in formation flight using two different models: a swept NACA 0012 non-cambered wing and a rectangular cambered NACA 63-420 wing simulating the trailing aircraft.
Proceedings ArticleDOI
Modeling of Wake Vortex Effects for Unmanned Air Vehicle Simulations
Deborah Saban,James F. Whidborne +1 more
TL;DR: In this paper, a generic wake vortex model (WVM) based on Weissinger's extended lifting-line theory has been developed and successfully implemented within a Matlab/Simulink simulation environment.
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A Study in Drag Reduction of Close Formation Flight Accounting for Flight Control Trim Positions and Dissimilar Formations
TL;DR: In this paper, the authors defined the position of greatest fuel savings benefit for the trail aircraft flying in a two-ship formation and investigated the effects of varying airspeed on the optimal position.
Proceedings ArticleDOI
Flow interaction between dissimilar UAVs in rendezvous conditions
TL;DR: This work aims to study the flow and wake of these vehicles in close proximity such that path planning, direction of approach and zones of relative safe motion may be proposed for RPAS or civilian UAVs which conform to ICAO regulations, the class of air vehicles where very little information exist.
References
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Compact finite difference schemes with spectral-like resolution
TL;DR: In this article, the authors present finite-difference schemes for the evaluation of first-order, second-order and higher-order derivatives yield improved representation of a range of scales and may be used on nonuniform meshes.
Journal ArticleDOI
Iterative multigrid approach in PIV image processing with discrete window offset
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Second-order accurate particle image velocimetry
TL;DR: The adaptive central difference interrogation (CDI) algorithm has two main advantages over conventional FDI-PIV interrogation algorithms: it is more accurate, especially at large time delays between camera exposures; and it provides a temporally symmetric view of the flow.
Proceedings ArticleDOI
Design, performance and modeling considerations for close formation flight
William Blake,Dieter Multhopp +1 more
Proceedings ArticleDOI
Flight Test Techniques Used to Evaluate Performance Benefits During Formation Flight
TL;DR: The Autonomous Formation Flight Research project has been implemented at the NASA Dryden Flight Research Center to demonstrate the benefits of formation flight and develop advanced technologies to facilitate exploiting these benefits as mentioned in this paper.