Experimental And Numerical Study Of The Bleed Effect On The Propagation Of Strong Plane And Converging Cylindrical Shock Waves


Experimental And Numerical Study Of The Bleed Effect On The Propagation Of Strong Plane And Converging Cylindrical Shock Waves
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Experimental And Numerical Study Of The Bleed Effect On The Propagation Of Strong Plane And Converging Cylindrical Shock Waves


Experimental And Numerical Study Of The Bleed Effect On The Propagation Of Strong Plane And Converging Cylindrical Shock Waves
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Author : Mourad El-Mallah
language : en
Publisher:
Release Date : 1997

Experimental And Numerical Study Of The Bleed Effect On The Propagation Of Strong Plane And Converging Cylindrical Shock Waves written by Mourad El-Mallah and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Shock waves categories.


A combined experimental-numerical study was conducted to determine the effect of bleeding on the propagation of plane and converging cylindrical shock waves. A fully 3-D Finite Element code was written for simulating inviscid unsteady flow in various cases of shock tube geometry. The scheme used was implicit time-marching with the Galerkin discretization for spatial coordinate derivatives and multi-step finite difference formulation for time derivatives. Initial trials with 1-D radial flow have shown good agreement with the analytical power law of shock propagation derived by Guderley. The numerical code was first applied to the test case of shock wave strengthening through its reflection from a 15° ramp. The numerical results of the shock front shape were found to be in good agreement with the Schlieren photographs taken for the flow at different time intervals. The numerical code was then applied to the test case of a plane shock interaction with a transverse slit. Experiments were carried out in this case to determine the degree of shock attenuation for shock Mach numbers ranging between 1.2 and 2.5, and slit-duct width ratios varying between 0.25 to 1.0. For this test case, a simplified model--based on the Method of Characteristics and the Chester-Chisnel-Whitham (CCW) theory--was also introduced. Numerical results for the attenuated shock Mach number were found to be in excellent agreement with the experimental results and the approximate analytical model. For the 2-D axisymmetric flows, domains similar to the plane flow cases were used to account for the radial convergence effect. Pressure measurements were also carried out at various radii to determine the pressure time history. The transmitted shock, past the slit, was found to undergo attenuation as in the 2-D case, but combined with strengthening due to area convergence. At the same location downstream of the slit, attenuation was found to be higher than in the 2-D case of similar slit-chamber width ratios.



Dimensional Analysis Beyond The Pi Theorem


Dimensional Analysis Beyond The Pi Theorem
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Author : Bahman Zohuri
language : en
Publisher: Springer
Release Date : 2016-11-02

Dimensional Analysis Beyond The Pi Theorem written by Bahman Zohuri and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-11-02 with Technology & Engineering categories.


Dimensional Analysis and Physical Similarity are well understood subjects, and the general concepts of dynamical similarity are explained in this book. Our exposition is essentially different from those available in the literature, although it follows the general ideas known as Pi Theorem. There are many excellent books that one can refer to; however, dimensional analysis goes beyond Pi theorem, which is also known as Buckingham’s Pi Theorem. Many techniques via self-similar solutions can bound solutions to problems that seem intractable. A time-developing phenomenon is called self-similar if the spatial distributions of its properties at different points in time can be obtained from one another by a similarity transformation, and identifying one of the independent variables as time. However, this is where Dimensional Analysis goes beyond Pi Theorem into self-similarity, which has represented progress for researchers. In recent years there has been a surge of interest in self-similar solutions of the First and Second kind. Such solutions are not newly discovered; they have been identified and named by Zel’dovich, a famous Russian Mathematician in 1956. They have been used in the context of a variety of problems, such as shock waves in gas dynamics, and filtration through elasto-plastic materials. Self-Similarity has simplified computations and the representation of the properties of phenomena under investigation. It handles experimental data, reduces what would be a random cloud of empirical points to lie on a single curve or surface, and constructs procedures that are self-similar. Variables can be specifically chosen for the calculations.



Inertial Confinement Fusion Driven Thermonuclear Energy


Inertial Confinement Fusion Driven Thermonuclear Energy
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Author : Bahman Zohuri
language : en
Publisher: Springer
Release Date : 2017-01-26

Inertial Confinement Fusion Driven Thermonuclear Energy written by Bahman Zohuri and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-01-26 with Technology & Engineering categories.


This book takes a holistic approach to plasma physics and controlled fusion via Inertial Confinement Fusion (ICF) techniques, establishing a new standard for clean nuclear power generation. Inertial Confinement Fusion techniques to enable laser-driven fusion have long been confined to the black-box of government classification due to related research on thermonuclear weapons applications. This book is therefore the first of its kind to explain the physics, mathematics and methods behind the implosion of the Nd-Glass tiny balloon (pellet), using reliable and thoroughly referenced data sources. The associated computer code and numerical analysis are included in the book. No prior knowledge of Laser Driven Fusion and no more than basic background in plasma physics is required.



Dissertation Abstracts International


Dissertation Abstracts International
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Author :
language : en
Publisher:
Release Date : 2000

Dissertation Abstracts International written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Dissertations, Academic categories.




American Doctoral Dissertations


American Doctoral Dissertations
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Author :
language : en
Publisher:
Release Date : 1999

American Doctoral Dissertations written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Dissertation abstracts categories.




International Aerospace Abstracts


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.




Applied Mechanics Reviews


Applied Mechanics Reviews
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Author :
language : en
Publisher:
Release Date : 1993

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 1993 with Mechanics, Applied categories.




Shock Tubes And Waves


Shock Tubes And Waves
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Author : Assa Lifshitz
language : en
Publisher:
Release Date : 1980

Shock Tubes And Waves written by Assa Lifshitz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Technology & Engineering categories.




Unsteady Effects Of Shock Wave Induced Separation


Unsteady Effects Of Shock Wave Induced Separation
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Author : Piotr Doerffer
language : en
Publisher: Springer Science & Business Media
Release Date : 2010-11-25

Unsteady Effects Of Shock Wave Induced Separation written by Piotr Doerffer 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 2010-11-25 with Technology & Engineering categories.


This volume contains description of experimental and numerical results obtained in the UFAST project. The goal of the project was to generate experiment data bank providing unsteady characteristics of the shock boundary layer interaction. The experiments concerned basic-reference cases and the cases with application of flow control devices. Obtained new data bank have been used for the comparison with available simulation techniques, starting from RANS, through URANS, LES and hybrid RANS-LES methods. New understanding of flow physics as well as ability of different numerical methods in the prediction of such unsteady flow phenomena will be discussed.



A Numerical Solution For The Interaction Of A Moving Shock Wave With A Turbulent Mixing Region


A Numerical Solution For The Interaction Of A Moving Shock Wave With A Turbulent Mixing Region
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Author : William Fred Walker
language : en
Publisher:
Release Date : 1966

A Numerical Solution For The Interaction Of A Moving Shock Wave With A Turbulent Mixing Region written by William Fred Walker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Shock waves categories.