The Wake Vortex Prediction and Monitoring System WSVBS Part I: Design

Holzäpfel, Frank; Gerz, Thomas; Frech, Michael; Tafferner, Arnold; Köpp, F.; Smalikho, Igor N.; Rahm, Stephan; Hahn, Klaus-Uwe; Schwarz, Carsten

doi:10.2514/atcq.17.4.301

Cited by 32 publications

(41 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For simplicity we consider diagonal wind, where headwind and crosswind have the same magnitude and analyze the resulting vortex behaviour. The modeling of wind effects in ground proximity for arbitrary wind directions is of vital interest for wake vortex advisory systems that optimize aircraft separations depending on the prevailing environmental conditions [50]. Figure 10 above depicts vortex trajectories for different wind strengths and directions.…”

Section: Effects Of Diagonal Windmentioning

confidence: 99%

Wind Impact on Single Vortices and Counterrotating Vortex Pairs in Ground Proximity

Holzäpfel

Tchipev

Stephan

2016

Flow Turbulence Combust

Self Cite

View full text Add to dashboard Cite

Wall-resolved large eddy simulations are employed to investigate the behaviour of wake vortices and single vortices in ground proximity at a variety of wind conditions. The six considered strengths of wind, ranging between 0.5 and 4 times the initial wake vortex descent speed, w 0 , include practically and theoretically significant wind speeds. A crosswind of 0.5 w 0 may lead to windward stall posing a potential hazard to subsequently landing aircraft, whereas theoretical considerations predict that at 4 w 0 the rebound of the luff vortex is completely suppressed. The same range of wind speeds is also used to investigate the effects of headwind and diagonal wind in order to discriminate between effects of environmental turbulence increasing with wind speed and the direction of the wind shear. The study has been complemented by a number of single vortex computations in order to differentiate between effects related to the mutual interaction of the vortex pair and the individual vortices with the turbulent boundary layer flow. It is shown that vortex ascent, descent, rebound and decay characteristics are controlled by (i) the interaction of the vortices with secondary vorticity detaching from the ground, (ii) the redistribution of vorticity of the boundary layer which is altering the path of the primary vortices by mutual velocity induction, and (iii) the interaction of the vortices with the environmental turbulence.

show abstract

Section: Effects Of Diagonal Windmentioning

confidence: 99%

Wind Impact on Single Vortices and Counterrotating Vortex Pairs in Ground Proximity

Holzäpfel

Tchipev

Stephan

2016

Flow Turbulence Combust

Self Cite

View full text Add to dashboard Cite

show abstract

“…To do this, several methods and combinations are possible. Since the prediction models are quite mature and have become part of some wake vortex advisory systems [1][2][3][4], the approach of collaboration described here preserves the model's structure as far as possible. One way to achieve this is to superimpose the model prediction with a fusion filter that is estimating the errors of the model prediction.…”

Section: Fusing Wake Vortex Prediction With Measurementmentioning

confidence: 98%

“…The prediction models use meteorological measurements or numerical weather predictions. In addition, wake vortex sensors like LIDAR are monitoring the prediction [1][2][3][4]. The described collaborative approach can be utilized in those ground based systems to closer fuse the wake vortex predictions with the monitoring functions.…”

Section: Implementation Constraintsmentioning

confidence: 99%

See 1 more Smart Citation

Collaboration of wake vortex models and sensors in modern avionic systems

Steen

Schönhals

Hecker

2009

2009 IEEE/AIAA 28th Digital Avionics Systems Conference

View full text Add to dashboard Cite

Today's airport capacity is severely limited by separation of approaching and to a lesser extent departing aircraft to ensure that following aircraft do not encounter the wake vortex generated by the preceding one. The encounter of wake vortices, especially during take-off and landing, can cause critical or even catastrophic flight situations for the succeeding plane. Historically, the wake vortex separation standards are based on a 'worst-casescenario' assuming calm and still air conditions responsible for a relatively long wake vortex lifetime. They have proven sufficiently safe but are unnecessarily limiting capacity in favourable, even in average weather conditions. Thus a capacity increase brought about by any change in separation rules has at least to preserve (or, given the expected traffic growth, even improve) the current level of safety. Accordingly, wake vortex warning systems have been devised to increase airside capacity and are nearing experimental implementation. The current systems contain a forecasting component based on meteorological conditions and on propagating the vortex evolution. Secondly a sensing system is ensuring the required level of safety. Both the model predictions and the sensing systems each have their advantages but also individual drawbacks. This paper presents a novel approach on collaboration of the wake vortex prediction and the sensing part. A general overview on the wake vortex phenomenon is given and an approach of fusing the wake vortex prediction with wake vortex measurement is shown. By means of examples the major advantages of the collaboration approach are presented. A discussion on implementation constraints of the proposed system closes the paper.

show abstract

“…To increase safety and capacity of aviation, concepts such as wakevortex advisory systems are being developed for arrivals, departures, and en route [6][7][8][9][10][11][12]. Many of these systems employ real-time prediction of wake-vortex behavior to determine when the intended flight track is clear from wake vortices.…”

Section: Introductionmentioning

confidence: 99%

Effects of Environmental and Aircraft Parameters on Wake Vortex Behavior

Holzäpfel

2014

Journal of Aircraft

Self Cite

View full text Add to dashboard Cite

This study investigates the impact of meteorological parameters (crosswind, headwind, wind shear, thermal stratification, turbulent kinetic energy, dissipation rate, and density) and aircraft parameters (position, heading, speed, weight, span, and spanwise load factor) on wake-vortex behavior. Typical measurement uncertainties of these parameters, on one hand, and the range in which they typically reside, on the other hand, are mapped on variations of lateral and vertical position and lifetime of the wake vortices. For this mapping process, the deterministic two-phase wake-vortex model is employed, complemented by some simple considerations, dimensional analysis, and sources from literature. Three scenarios comprising cruise conditions, flight within the atmospheric boundary layer, and ground proximity are considered. From these investigations, the following ranking of the impact parameters has been deduced: wind, thermal stratification, turbulence, position, mass, and spanwise load factor. The relevance of the remaining parameters appears small.

show abstract

The Wake Vortex Prediction and Monitoring System WSVBS Part I: Design

Cited by 32 publications

References 11 publications

Wind Impact on Single Vortices and Counterrotating Vortex Pairs in Ground Proximity

Wind Impact on Single Vortices and Counterrotating Vortex Pairs in Ground Proximity

Collaboration of wake vortex models and sensors in modern avionic systems

Effects of Environmental and Aircraft Parameters on Wake Vortex Behavior

Contact Info

Product

Resources

About