January 15, 2021

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Vortex wakes of Aircrafts

Vortex wakes of Aircrafts
Author : A.S. Ginevsky,A. I. Zhelannikov
Publisher : Springer Science & Business Media
Release Date : 2009-07-07
Category : Mathematics
Total pages :154
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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 aircraft. The encounter of other aircraft with the vortex wake of a heavy aircraft is open to catastrophic hazards. For example, air refueling is adangerous operationpartly due to thepossibility of the receiver aircraft’s encountering the trailing wake of the tanker aircraft. It is very important to know the behavior of vortex wakes of aircraft during theirtakeoff andlanding operations whenthe wakes canpropagate over the airport’s ground surface and be a serious hazard to other depart ing or arriving aircraft. This knowledge can help in enhancing safety of aircraft’s movements in the terminal areas of congested airports where the threat of vortex encounters limits passenger throughput. Theoreticalinvestigations of aircraft vortex wakes arebeingintensively performedinthe major aviationnations.Usedforthispurpose are various methods for mathematical modeling of turbulent flows: direct numerical simulation based on the Navier–Stokes equations, large eddy simulation using the Navier–Stokes equations in combination with subrigid scale modeling, simulation based on the Reynolds equations closed with a differential turbulence model. These approaches are widely used in works of Russian and other countries’ scientists. It should be emphasized that the experiments in wind tunnels and studies of natural vortex wakes behind heavy and light aircraft in flight experiments are equally important.

Aircraft Wake Vortex Takeoff Tests at O'Hare International Airport

Aircraft Wake Vortex Takeoff Tests at O'Hare International Airport
Author : Anonim
Publisher : Unknown
Release Date : 1994
Category : Airplanes
Total pages :96
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Aircraft Vortex Wakes in Relation to Terminal Operations

Aircraft Vortex Wakes in Relation to Terminal Operations
Author : Joseph W. Wetmore,John P. Reeder
Publisher : Unknown
Release Date : 1963
Category : Geostationary satellites
Total pages :23
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Aircraft Wake Turbulence and Its Detection

Aircraft Wake Turbulence and Its Detection
Author : John Olsen
Publisher : Springer Science & Business Media
Release Date : 2012-12-06
Category : Technology & Engineering
Total pages :602
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The combination of increasing airport congestion and the ad vent of large transports has caused increased interest in aircraft wake turbulence. A quantitative understanding of the interaction between an aircraft and the vortex wake of a preceding aircraft is necessary for planning future high density air traffic patterns and control systems. The nature of the interaction depends on both the characteristics of the following aircraft and the characteristics of the wake. Some of the questions to be answered are: What deter mines the full characteristics of the vortex wake? What properties of the following aircraft are important? What is the role of pilot response? How are the wake characteristics related to the genera ting aircraft parameters? How does the wake disintegrate and where? Many of these questions were addressed at this first Aircraft Wake Turbulence Symposium sponsored by the Air Force Office of Sci entific Research and The Boeing Company. Workers engaged in aero dynamic research, airport operations, and instrument development came from several count ries to present their results and exchange information. 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 important tools for understanding or controlling vortex wakes. The new types of instability occurring within the wake may one day be used for promoting early dis integration of the hazardous twin vortex structure.

Simulation of Vortex Wake Impact on a General-aviation Aircraft Model in a Wind Tunnel Using the Airfoil Lattice

Simulation of Vortex Wake Impact on a General-aviation Aircraft Model in a Wind Tunnel Using the Airfoil Lattice
Author : Yu S. Mikhailov
Publisher : Unknown
Release Date : 1996
Category :
Total pages :129
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Exploratory Flight Investigation of Aircraft Response to the Wing Vortex Wake Generated by Jet Transport Aircraft

Exploratory Flight Investigation of Aircraft Response to the Wing Vortex Wake Generated by Jet Transport Aircraft
Author : William H. Andrews
Publisher : Unknown
Release Date : 1972
Category : Aerodynamics
Total pages :31
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The effect of intercepting wing tip vortices generated by large jet transports, including jumbo jets, over separation distances from 1 nautical mile to 15 nautical miles is evaluated on the basis of the response of a vortex probe airplane in the roil mode. The vortex probe test aircraft included a representative general aviation airplane, an executive jet, a fighter, and light and medium weight jet transports. The test conditions and airplane configurations were comparable to those normally used during takeoff, landing, or holding pattern operations. For flight safety the tests were performed at altitudes from 9500 feet to 12,500 feet. In addition to an evaluation of the probe airplane response, a flight test technique is suggested for determining minimum separation distance, using as variable the ratio of vortex-induced roll acceleration to maximum lateral control acceleration and the gross weight of the generating aircraft.

Introduction to Jet-engine Exhaust and Trailing Vortex Wakes

Introduction to Jet-engine Exhaust and Trailing Vortex Wakes
Author : Dale N. Jones
Publisher : Unknown
Release Date : 1970
Category : Atmospheric turbulence
Total pages :30
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Vortex Wake Investigation of a Twin-tail Fighter Aircraft Model at High Angles of Attack with and Without Lex Fences

Vortex Wake Investigation of a Twin-tail Fighter Aircraft Model at High Angles of Attack with and Without Lex Fences
Author : Sheshagiri K. Hebbar
Publisher : Unknown
Release Date : 1993
Category :
Total pages :129
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A Candidate Wake Vortex Strength Definition for Application to the NASA Aircraft Vortex Spacing System (AVOSS)

A Candidate Wake Vortex Strength Definition for Application to the NASA Aircraft Vortex Spacing System (AVOSS)
Author : David A. Hinton
Publisher : Unknown
Release Date : 1997
Category : Airports
Total pages :36
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Vortex Wakes of Conventional Aircraft

Vortex Wakes of Conventional Aircraft
Author : Coleman duPont Donaldson,Alan J. Bilanin
Publisher : Unknown
Release Date : 1975
Category : Turbulence
Total pages :79
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A review is made of the present state of our knowledge of the vortex wakes of conventional aircraft. Included are discussions of wake rollup, geometry, instability, and turbulent aging. In the light of these discussions, a brief review is made of the persistence of vortices in the atmosphere, and design techniques which might be used to minimize wake hazard are considered.

Flow Visualization of Vortex Interactions in Multiple Vortex Wakes Behind Aircraft

Flow Visualization of Vortex Interactions in Multiple Vortex Wakes Behind Aircraft
Author : Anonim
Publisher : Unknown
Release Date : 1975
Category :
Total pages :59
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Aircraft Vortex Wake Decay Near the Ground

Aircraft Vortex Wake Decay Near the Ground
Author : Anonim
Publisher : Unknown
Release Date : 1977
Category : Aerodynamics
Total pages :129
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New Results in Numerical and Experimental Fluid Mechanics III

New Results in Numerical and Experimental Fluid Mechanics III
Author : Siegfried Wagner,Ulrich Rist,Hans-Joachim Heinemann,Reinhard Hilbig
Publisher : Springer Science & Business Media
Release Date : 2002-02-26
Category : Technology & Engineering
Total pages :436
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This volume contains the papers of a German symposium dealing with research and project work in numerical and experimental aerodynamics and fluidmechanics for aerospace and other applications. It gives a broad overview over the ongoing work in this field in Germany.

High Performance Computing in Science and Engineering ' 08

High Performance Computing in Science and Engineering ' 08
Author : Wolfgang E. Nagel
Publisher : Springer Science & Business Media
Release Date : 2009-01-10
Category : Mathematics
Total pages :613
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The discussions and plans on all scienti?c, advisory, and political levels to realize an even larger “European Supercomputer” in Germany, where the hardware costs alone will be hundreds of millions Euro – much more than in the past – are getting closer to realization. As part of the strategy, the three national supercomputing centres HLRS (Stuttgart), NIC/JSC (Julic ̈ h) and LRZ (Munich) have formed the Gauss Centre for Supercomputing (GCS) as a new virtual organization enabled by an agreement between the Federal Ministry of Education and Research (BMBF) and the state ministries for research of Baden-Wurttem ̈ berg, Bayern, and Nordrhein-Westfalen. Already today, the GCS provides the most powerful high-performance computing - frastructure in Europe. Through GCS, HLRS participates in the European project PRACE (Partnership for Advances Computing in Europe) and - tends its reach to all European member countries. These activities aligns well with the activities of HLRS in the European HPC infrastructure project DEISA (Distributed European Infrastructure for Supercomputing Appli- tions) and in the European HPC support project HPC-Europa. Beyond that, HLRS and its partners in the GCS have agreed on a common strategy for the installation of the next generation of leading edge HPC hardware over the next ?ve years. The University of Stuttgart and the University of Karlsruhe have furth- more agreed to bundle their competences and resources.

Aircraft Wake Vortices

Aircraft Wake Vortices
Author : James N. Hallock
Publisher : Unknown
Release Date : 1991
Category : Aerodynamics
Total pages :386
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