Whole Field Measurements Of Turbulent Flow For The Study Of Aero Optical Effects
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Whole Field Measurements Of Turbulent Flow For The Study Of Aero Optical Effects
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Author :
language : en
Publisher:
Release Date : 1998
Whole Field Measurements Of Turbulent Flow For The Study Of Aero Optical Effects 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 categories.
Aerooptical phenomena associated with the propagation of optical beams and imaging through turbulent index-of-refraction fields have been investigated. Using simultaneous imaging of optical-beam distortion and the turbulent index-or-refraction field, we have documented near-field behavior, following propagation through moderate-to-high Reynolds number jets and shear layers. For both flows, propagation through turbulence may result in the formation of caustics. Preliminary measurements using the Palomar 200" telescope confirm the formation of caustics in atmospheric propagation, using bright stars as sources. Spatial wavefront and wavefront-tilt measurements of beams emerging from jet and shear layer regions exhibit non-Kolmogorov behavior. Preliminary efforts to reconstruct images through turbulence indicate the need for both amplitude and wavefront-tilt measurements for reliable image reconstruction.
Prediction And Measurement Of Aero Optic Effects Through The Dynamics Of A Passive Scalar In Turbulent Shear Flow
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Author : C. Randall Truman
language : en
Publisher:
Release Date : 1994
Prediction And Measurement Of Aero Optic Effects Through The Dynamics Of A Passive Scalar In Turbulent Shear Flow written by C. Randall Truman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.
Turbulent Flows
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Author : G. Biswas
language : en
Publisher: Narosa Publishing House
Release Date : 2002
Turbulent Flows written by G. Biswas and has been published by Narosa Publishing House this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Technology & Engineering categories.
This book allows readers to tackle the challenges of turbulent flow problems with confidence. It covers the fundamentals of turbulence, various modeling approaches, and experimental studies. The fundamentals section includes isotropic turbulence and anistropic turbulence, turbulent flow dynamics, free shear layers, turbulent boundary layers and plumes. The modeling section focuses on topics such as eddy viscosity models, standard K-E Models, Direct Numerical Stimulation, Large Eddy Simulation, and their applications. The measurement of turbulent fluctuations experiments in isothermal and stratified turbulent flows are explored in the experimental methods section. Special topics include modeling of near wall turbulent flows, compressible turbulent flows, and more.
Aero Optical Effects
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Author : Stanislav Gordeyev
language : en
Publisher: John Wiley & Sons
Release Date : 2023-01-04
Aero Optical Effects written by Stanislav Gordeyev and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-01-04 with Science categories.
AERO-OPTICAL EFFECTS Explore the newest techniques and technologies used to mitigate the effects of air flow over airborne laser platforms Aero-Optical Effects: Physics, Analysis and Mitigation delivers a detailed and insightful introduction to aero-optics and fully describes the current understanding of the physical causes of aero-optical effects from turbulent flows at different speeds. In addition to presenting a thorough discussion of instrumentation, data reduction, and data analysis, the authors examine various approaches to aero-optical effect mitigation using both flow control and adaptive optics approaches. The book explores the sources, characteristics, measurement approaches, and mitigation means to reduce aero-optics wavefront error. It also examines the precise measurements of aero-optical effects and the instrumentation of aero-optics. Flow control for aero-optical applications is discussed, as are approaches like passive flow control, active and hybrid flow control, and closed-loop flow control. Readers will benefit from discussions of the applications of aero-optics in relation to fields like directed energy and high-speed communications. Readers will also enjoy a wide variety of useful features and topics, including: Comprehensive discussions of both aero-effects, which include the effects that air flow has over a beam director mounted on an aircraft, and aero-optics, which include atmospheric effects that degrade the ability of an airborne laser to focus a beam A treatment of air buffeting and its effects on beam stabilization and jitter An analysis of mitigating impediments to the use of high-quality laser beams from aircraft as weapons or communications systems Adaptive optics compensation for aero-optical disturbances Perfect for researchers, engineers, and scientists involved with laser weapon and beam control systems, Aero-Optical Effects: Physics, Analysis and Mitigation will also earn a place in the libraries of principal investigators in defense contract work and independent research and development.
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.
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Schlieren Systems Analysisfor Investigation Of Aero Optical Effects In Refractive Turbulent Flows
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Author : Boris Zakharin
language : en
Publisher:
Release Date : 2004
Schlieren Systems Analysisfor Investigation Of Aero Optical Effects In Refractive Turbulent Flows written by Boris Zakharin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
29th Plasmadynamics And Lasers Conference
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Author :
language : en
Publisher:
Release Date : 1998
29th Plasmadynamics And Lasers Conference 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 Lasers categories.
The Generation And Measurement Of Turbulent Flow Fields
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Author : Stephen George Russ
language : en
Publisher:
Release Date : 1989
The Generation And Measurement Of Turbulent Flow Fields written by Stephen George Russ and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Turbulence categories.
Applied Mechanics Reviews
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Author :
language : en
Publisher:
Release Date : 1989
Applied Mechanics Reviews written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Mechanics, Applied categories.
Turbulent Flow Analysis And Coherent Structure Identification In Experimental Models With Complex Geometries
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Author : Noushin Amini
language : en
Publisher:
Release Date : 2012
Turbulent Flow Analysis And Coherent Structure Identification In Experimental Models With Complex Geometries written by Noushin Amini and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Turbulent flows and coherent structures emerging within turbulent flow fields have been extensively studied for the past few decades and a wide variety of experimental and numerical techniques have been developed for measurement and analysis of turbulent flows. The complex nature of turbulence requires methods that can accurately estimate its highly chaotic spatial and temporal behavior. Some of the classical cases of turbulent flows with simpler geometries have been well characterized by means of the existing experimental techniques and numerical models. Nevertheless, since most turbulent fields are of complex geometries; there is an increasing interest in the study of turbulent flows through models with more complicated geometries. In this dissertation, characteristics of turbulent flows through two different facilities with complex geometries are studied applying two different experimental methods. The first study involves the investigation of turbulent impinging jets through a staggered array of rods with or without crossflow. Such flows are crucial in various engineering disciplines. This experiment aimed at modeling the coolant flow behavior and mixing phenomena within the lower plenum of a Very High Temperature Reactor (VHTR). Dynamic Particle Image Velocimetry (PIV) and Matched Index of Refraction (MIR) techniques were applied to acquire the turbulent velocity fields within the model. Some key flow features that may significantly enhance the flow mixing within the test section or actively affect some of the structural components were identified in the velocity fields. The evolution of coherent structures within the flow field is further investigated using a Snapshot Proper Orthogonal Decomposition (POD) technique. Furthermore, a comparative POD method is proposed and successfully implemented for identification of the smaller but highly influential coherent structures which may not be captured in the full-field POD analysis. The second experimental study portrays the coolant flow through the core of an annular pebble bed VHTR. The complex geometry of the core and the highly turbulent nature of the coolant flow passing through the gaps of fuel pebbles make this case quite challenging. In this experiment, a high frequency Hot Wire Anemometry (HWA) system is applied for velocity measurements and investigation of the bypass flow phenomena within the near wall gaps of the core. The velocity profiles within the gaps verify the presence of an area of increased velocity close to the outer reflector wall; however, the characteristics of the coolant flow profile is highly dependent on the gap geometry and to a less extent on the Reynolds number of the flow. The time histories of the velocity are further analyzed using a Power Spectra Density (PSD) technique to acquire information about the energy content and energy transfer between eddies of different sizes at each point within the gaps.