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2 Research Bulletin / Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics

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Vortex wake safety - the problem of encountering aircraft

Mikhailov Y., Vyshinsky V.

Research Bulletin / Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics

1999

nr 9

91-100

When flying through the atmosphere an aircraft generates a stable vortex wake posing a hazard for other aircraft. A sudden path disturbance caused by the trailing turbulence is most dangerous at low altitudes due to a possible collision with the ground. Encountering an intensive wake may lead to a strctural failure. Maintaining safe-separation distances reduces airport capacity and eventually results in economic losses. To solve this problem on a rational basis, it is necessary to create an adequate aerodynamic vortex wake model and determine wake characteristics as well as create a flight-dynamic and structural-strength models for the trailing turbulence conditions, determine, aircraft response, and work out on this basis concrete measures aimed at enhancing airport capacity. All tree issues and especially means for increasing aircraft controllability are briefly considered in the present paper.

Vortex wake safety - aerodynamics and flight dynamics aspects of the problem

Vyshinsky V., Yaroshevsky V.

Research Bulletin / Warsaw University of Technology, Institute of Aeronautics and Applied Mechanics

1998

nr 8

25-34

The main problem discussed in the paper is an approach to establishing criteria for aircraft safe separation distances during take off and landing operations on the same runway. The vortex wake longitudinal penetration is a critical situation here. A "worst case" method is not acceptable in this case, instead of it probabilistic approaches are used. Some measures aimed at improving flight safety are suggested, including the development of an onboard vortex detection and vortex avoidance maneuver system.