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Numerical Analysis of Transition Effects for SCRamjet Intake Flows

Martin Krause

Published by Shaker Verlag Jul 2010, 2010
ISBN 10: 3832292160 / ISBN 13: 9783832292164
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Title: Numerical Analysis of Transition Effects for...

Publisher: Shaker Verlag Jul 2010

Publication Date: 2010

Binding: Taschenbuch

Book Condition: Neu


Neuware - A combined investigation based on numerical analysis and experimental examination of SCRamjet intake geometries is undertaken within the Research Training Group (GRK) 1095/1. It is the purpose of this thesis to focus on the examination of laminar to turbulent transition for hypersonic boundary layers and its influence on the shock wave/boundary layer interaction for intake flows. First, the work presents a summary of the flow phenomena that have to be considered for hypersonic intake flows. It is followed by a general introduction of the research that has been done over the last decades in many different countries. For a better understanding of the conceptional design issues of SCRamjet intakes a review of existing and examined configurations is provided together with an evaluation of the advantages and disadvantages of the different designs. Second, the physical basis of laminar to turbulent transition is explained and the different reasons for this phenomenon are discussed in detail. After this a review of the possible numerical methods for predicting as well as modelling transition is given. Direct Numerical Simulation (DNS) and Large Eddy Simulation (LES) are described in general and their ability of predicting transition for macro three-dimensional industrial applications is pointed out. It is concluded that the only appropriate way of modelling transition for flow problems investigated within this project is using Reynolds-Averaged Navier-Stokes equations (RANS). Therefore, the governing equations are presented together with the closure mechanism to get a complete set of equations to perform simulations of Newtonian fluid flow. Additionally, the time averaged techniques are shortly introduced. Furthermore, the boundary conditions as well as time integration methods are presented. Finally, several transition models for RANS equations are described to give an overview of their applicability to 3D hypersonic transitional flow. The Langtry/Menter transition model is selected and described in detail together with the SST turbulence model that forms the basis for the transition equations. The Langtry/Menter transition model has not been published completely in technical literature when this work was done. Two correlations that describe the transition length and onset are missing. Therefore, this thesis shows how to create own correlations for subsonic as well as super- and hypersonic flow conditions. Due to the topic of this work the focus is put on the correlations for the super- and hypersonic flow regime. 173 pp. Englisch. Bookseller Inventory # 9783832292164

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