61 research outputs found
Helicopter tail rotor orthogonal blade vortex interaction
The aerodynamic operating environment of the helicopter is particularly complex and,
to some extent, dominated by the vortices trailed from the main and tail rotors. These
vortices not only determine the form of the induced flow field but also interact with
each other and with elements of the physical structure of the flight vehicle. Such
interactions can have implications in terms of structural vibration, noise generation
and flight performance. In this paper, the interaction of main rotor vortices with the
helicopter tail rotor is considered and, in particular, the limiting case of the orthogonal
interaction. The significance of the topic is introduced by highlighting the operational
issues for helicopters arising from tail rotor interactions. The basic phenomenon is
then described before experimental studies of the interaction are presented. Progress
in numerical modelling is then considered and, finally, the prospects for future
research in the area are discussed
Coeficiente de erodibilidade em sulcos e entressulcosde Argissolos coesos estimado pela cor do solo
ReflexĂ”es sobre a ConferĂȘncia das NaçÔes Unidas contra o Racismo, a IntolerĂąncia Racial, a Xenofobia e a IntolerĂąncia Correlata
An evaluation of the Dirochek test for detection of Dirofilaria immitis antigen in dogs.
Teleoperation of Legged Vehicles: Unique Problems Associated with Walking and Foot Placement
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