downwash


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down·wash

 (doun′wŏsh′, -wôsh′)
n.
The downward deflection of air from a moving object, such as an airplane wing or propeller.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

downwash

(ˈdaʊnˌwɒʃ)
n
(Aeronautics) the downward deflection of an airflow, esp one caused by an aircraft wing
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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References in periodicals archive ?
"And then we slowly brought it back up, it gets into the same downwash from the aircraft and it started to spin again."
For example, MSC Software's Adams multibody dynamics simulation solution was recently used by Saab to accurately capture interactions between the lifting forces on the rotor blades and downwash on one of its prototype UAVs.
The junction between the upper body taper and the un-tapered lower body (the shoulder) produced a streamwise vortex that generates downwash.
The finite volume discretization approach is used to discretize the whole domain so that separation of wind flow, upwash, and downwash mechanisms can happen similar to the experimental study.
Also, the tail zero-lift-pitching moment coefficient ([C.sub.Mo_HT] is then estimated using (13) [21], where [C.sub.L[alpha]_HT] is the lift curve slope of the tail, [[epsilon].sub.o] is the downwash angle at zero lift, [i.sub.W] is the wing incidence angle, and [i.sub.HT] is the tail incidence angle.
On the ground that morning, amid the brush rippling under the powerful downwash, was a helicopter support team of Marines from Combat Logistics Battalion (CLB) 25.
Using vortex discretized airfoils, Singh and Friedmann's 2D simulations included effects of downwash and shed vorticity by using periodic boundaries.
These propellers are attached to a V-shaped box-wing structure designed to minimise the blocking of the main rotor's downwash, while still delivering lift performance of their own.
It's probably because of the curvature, you get quite a bit of distortion, plus you get quite a bit of downwash down the straights pushing the helmet forwards.
It changes the airflow aft of the wings, deflecting it downward, which causes increased downwash over the tail, increasing its angle of attack, whether it is a high- or low-wing airplane.
Reading all those war books taught me some helicopter terminology, like "translational lift." Simply put, when a helo is moving slowly, the main rotor's downwash creates vortexes and general turbulence immediately around it.