The Influence Of Reynolds Number And Atmospheric Effects On Aircraft Wake Vortices Near The Ground
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The Influence Of Reynolds Number And Atmospheric Effects On Aircraft Wake Vortices Near The Ground
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Author : Zhongquan Charlie Zheng
language : en
Publisher:
Release Date : 1993
The Influence Of Reynolds Number And Atmospheric Effects On Aircraft Wake Vortices Near The Ground written by Zhongquan Charlie Zheng and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Reynolds number categories.
The Effects Of Atmospheric Turbulence On Aircraft Wake Vortices Near The Ground
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Author : Z. C. Zheng
language : en
Publisher:
Release Date : 1996
The Effects Of Atmospheric Turbulence On Aircraft Wake Vortices Near The Ground written by Z. C. Zheng and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.
Vortex Wakes Of Aircrafts
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Author : A.S. Ginevsky
language : en
Publisher: Springer Science & Business Media
Release Date : 2009-07-07
Vortex Wakes Of Aircrafts written by A.S. Ginevsky and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-07-07 with Mathematics categories.
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.
Atmospheric Wake Vortex Interactions
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Author :
language : en
Publisher:
Release Date : 1978
Atmospheric Wake Vortex Interactions written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with categories.
The Role Of Turbulence In Chemical And Dynamical Processes In The Near Field Wake Of Subsonic Aircraft
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-06-20
The Role Of Turbulence In Chemical And Dynamical Processes In The Near Field Wake Of Subsonic Aircraft written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-06-20 with categories.
During this grant, covering the period from September 1998 to December 2001, we continued the investigation of the role of turbulent mixing in the wake of subsonic aircraft initiated in 1994 for NASA's Atmospheric Effects of Aviation Project. The goal of the research has been to provide sufficient understanding and quantitative analytical capability to assess the dynamical, chemical, and microphysical interactions in the near-field wake that have the greatest potential to influence the global atmospheric impact of the projected fleet of subsonic aircraft. Through large-eddy simulations we have shown that turbulence in the early wake dynamics can have a strong effect on both the ice microphysics of contrail evolution and on wake chemistry. The wake vortex dynamics are the primary determinant of the vertical extent of the contrail; this together with the local wind shear largely determines the horizontal extent. The fraction of the initial ice crystals surviving the wake vortex dynamics, their spatial distribution, and the ice mass distribution are all sensitive to the aircraft type, assumed initial ice crystal number, and ambient humidity and turbulence conditions. Our model indicates that there is a significant range of conditions for which a smaller aircraft such as a B737 produces as significant a persistent contrail as a larger aircraft such as a B747, even though the latter consumes almost five times as much fuel. Large-eddy simulations of the near wake of a B757 provided a fine-grained chemical-dynamical representation of simplified NOx - HOx chemistry in wakes of ages from a few seconds to several minutes. By sampling the simulated data in a manner similar to that of in situ aircraft measurements it was possible to provide a likely explanation for a puzzle uncovered in the 1996 SUCCESS flight measurements of OH and HO2 The results illustrate the importance of considering fluid dynamics effects in interpreting chemistry results when mixing rates and species flu
Aircraft Vortex Wake Decay Near The Ground
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Author :
language : en
Publisher:
Release Date : 1977
Aircraft Vortex Wake Decay Near The Ground written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Aerodynamics categories.
Aircraft Wake Vortices
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Author : James N. Hallock
language : en
Publisher:
Release Date : 1991
Aircraft Wake Vortices written by James N. Hallock and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Aerodynamics categories.
Proceedings Of The Aircraft Wake Vortices Conference Washington D C October 29 31 1991
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Author :
language : en
Publisher:
Release Date : 1992
Proceedings Of The Aircraft Wake Vortices Conference Washington D C October 29 31 1991 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Meteorology in aeronautics categories.
Vortex Wakes Of Conventional Aircraft
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Author : Coleman duPont Donaldson
language : en
Publisher:
Release Date : 1975
Vortex Wakes Of Conventional Aircraft written by Coleman duPont Donaldson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Turbulence categories.
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.
An Analytical Study Of The Effect Of Airplane Wake On The Lateral Dispersion Of Aerial Sprays
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Author : Wilmer H. Reed
language : en
Publisher:
Release Date : 1953
An Analytical Study Of The Effect Of Airplane Wake On The Lateral Dispersion Of Aerial Sprays written by Wilmer H. Reed and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1953 with Aerial spraying and dusting in agriculture categories.
Calculations are made to determine the trajectories of liquid droplets introduced into the air disturbances generated by an airplane engaged in aerial spraying. The effects of such factors as the positiion at which the droplets are ejected into the disturbances, airplane lift coefficient, and altitude are investigated. The distribution of deposit on the ground is computed for several droplet-size spectra, variations in the rate at which mass is ejected along the span, and lateral flight-path spacings. Consideration is then given to the problem of adjusting these factors with the aim of improving the uniformity and increasing the effective width of the deposit.