Today, wake-turbulence-related aircraft separations are a limiting factor for the capacity of airports worldwide. A detailed knowledge about the severity of potential wake encounters is necessary for a safe revision of the current International Civil Aviation Organization separation requirements. Vortex encounter simulation is an important part in building an understanding how the encountering aircraft is adversely affected by the vortex-induced disturbances. Whereas most research has focused on aircraft encounters with a pair of straight vortices, this work focuses on the simulation of encounters with perturbed vortices as they are observed under various atmospheric conditions. In addition, a method to account for unsteady aerodynamic effects during the computation of vortex-induced forces and moments is presented. Those effects are becoming especially important for vortex-induced disturbances of a higher-frequency range as they may appear during encounters with perturbed vortices. This combination of models for vortex deformation due to long-wave Crow instability and unsteady aerodynamic models increases the realism of encounter simulations. The simulation models are suited for real-time and fast-time applications, such as piloted-flight-simulator experiments and fast-time Monte Carlo simulations. The results of a simulator study with airline pilots are discussed concerning the differences between encounters with straight and perturbed vortices.
Simulation of Aircraft Encounters with Perturbed Vortices Considering Unsteady Aerodynamic Effects
Journal of Aircraft ; 51 , 3 ; 705-718
2014-05-01
Conference paper , Article (Journal)
Electronic Resource
English
Simulation of Aircraft Encounters with Perturbed Vortices Considering Unsteady Aerodynamic Effects
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