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The Role Of Turbulence In Chemical And Dynamical Processes In The Near Field Wake Of Subsonic Aircraft

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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

International Aerospace Abstracts

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Author :
language : en
Publisher:
Release Date : 1998

International Aerospace Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Aeronautics categories.

Scientific And Technical Aerospace Reports

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Author :
language : en
Publisher:
Release Date : 1995

Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.

Atmospheric Effects Of Aviation

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Author : Anne M. Thompson
language : en
Publisher:
Release Date : 1996

Atmospheric Effects Of Aviation written by Anne M. Thompson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Aerosols categories.

Turbulent Shear Layers In Supersonic Flow

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Author : Alexander J. Smits
language : en
Publisher: Springer Science & Business Media
Release Date : 2006-05-11

Turbulent Shear Layers In Supersonic Flow written by Alexander J. Smits 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 2006-05-11 with Science categories.

A good understanding of turbulent compressible flows is essential to the design and operation of high-speed vehicles. Such flows occur, for example, in the external flow over the surfaces of supersonic aircraft, and in the internal flow through the engines. Our ability to predict the aerodynamic lift, drag, propulsion and maneuverability of high-speed vehicles is crucially dependent on our knowledge of turbulent shear layers, and our understanding of their behavior in the presence of shock waves and regions of changing pressure. Turbulent Shear Layers in Supersonic Flow provides a comprehensive introduction to the field, and helps provide a basis for future work in this area. Wherever possible we use the available experimental work, and the results from numerical simulations to illustrate and develop a physical understanding of turbulent compressible flows.

The Effect Of Chemical Reactions In The Turbulent Mixing Component On The Dynamics And Thermodynamics Of Wake Flow Fields

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Author : Lorin Richard Davis
language : en
Publisher:
Release Date : 1964

The Effect Of Chemical Reactions In The Turbulent Mixing Component On The Dynamics And Thermodynamics Of Wake Flow Fields written by Lorin Richard Davis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1964 with Turbulence categories.