by National Aeronautics and Space Administration, for sale by the National Technical Information Service in Washington, Springfield, Va .
Written in English
|Statement||Alan J. Bilanin ... [et al.].|
|Series||NASA contractor report ; NASA CR-2870, NASA contractor report -- NASA CR-2870.|
|Contributions||Bilanin, Alan J., United States. National Aeronautics and Space Administration., Aeronautical Research Associates of Princeton.|
|The Physical Object|
|Pagination||119 p. :|
|Number of Pages||119|
Investigation of vortex wakes behind various aircraft, especially behind wide bodied and heavy cargo ones, is of both scientific and practical in terest. The vortex wakes shed from the wing’s trailing edge are long lived and attenuate only atdistances of10–12kmbehindthe wake generating : Hardcover. Fundamental vortex phenomena: instabilities and interactions with jets and wakes Conference Paper (PDF Available) September with Reads How we measure 'reads'. The strength of the vortex is governed by the weight, speed, and shape of the wing of the generating aircraft. The vortex characteristics of any given aircraft can also be changed by extension of flaps or other wing configuring devices as well as by change in speed. However, as the basic factor is weight, the vortex strength increases. Aircraft Wake Phenomena, ), is presented. The main objective of this upstream research project is to gain better knowledge about open issues of vortex dynamics relevant to aircraft wakes, by investigating the following main topics, each treated in a separate work package: 1) the role of vortex instabilities on wake decay, 2) the influence.
The persistent trailing vortices behind jumbo jets constitute a hazard to other aircraft, which has led to a study of vortex formation by the roll-up of vortex sheets and the decay and interaction. Aircraft Wake Turbulence and Its Detection Decay of a Vortex Pair behind an Aircraft. J. N. Nielsen, Richard G. Schwind. The new results from the meeting provide a current picture of the state of the knowledge on vortex wakes and their interactions with other aircraft. Phenomena previously regarded as mere curiosities have emerged as. We present the Direct Numerical Simulations of high Reynolds numbers aircraft wakes employing vortex particle methods. The simulations involve a highly efficient implementation of vortex methods on massively parallel computers, enabling unprecedented simulations using billions of by: Aircraft wake vortex evolution in ground proximity is investigated experimentally in a water towing tank, as well as numerically with wall-resolved large eddy simulation (LES). With these complementary instruments the enhancement of wake vortex decay by obstacles, introduced at the ground surface, is analyzed. The experimental methods include time-resolved stereo particle image Cited by:
The method is applied to the decay of aircraft wakes and vortex rings. The wake of an aircraft consists of long trailing vortices that can subject the fol-lowing aircraft to a large downwash. Several research eﬀorts have focused on the identiﬁcation of the governing physical mechanisms of wake evolution that. A new vortex sheet model was proposed for simulating aircraft wake vortex evolution. Rather than beginning with a pair of counter-rotating cylindrical vortices as in the traditional models, a lift-drag method is used to initialize a vortex sheet so that the roll-up phase is taken into by: 3. • The aircraft crossing one of the gates generates a pair of wake vortices (WV) that are transported (also by the headwind) and also decay. The Deterministic wake Vortex Model (DVM) • The DVM forecasts, in real-time, the WV behavior (transport and decay) in one . A quantitative understanding of the interaction between an aircraft and the vortex wake of a preceding aircraft is necessary for planning future high Aircraft Wake Turbulence and Its Detection - Proceedings of a Symposium on Aircraft Wake Turbulence held in Seattle, Washington, September 1–3,