Structure Of The Compressible Turbulent Shear Layer
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Turbulent Shear Layers in Supersonic Flow
Author: Alexander J. Smits
language: en
Publisher: Springer Science & Business Media
Release Date: 2006-05-11
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.
Eddy Structure Identification in Free Turbulent Shear Flows
Author: J.P. Bonnet
language: en
Publisher: Springer Science & Business Media
Release Date: 2012-12-06
The existence and crucial role played by large-scale, organized motions in turbulent flows are now recognized by industrial, applied and fundamental researchers alike. It has become increasingly evident that coherent structures influence mixing, noise, vibration, heat transfer, drag, etc... The accelera tion of the development of both experimental and computational programs devoted to this topic has been evident at several recent international meet ings. One of the first questions which experimentalists or numerical analysts are faced with is: how can these structures be separated from the background turbulence? This is a nontrivial task because the coherent structures are gen erally embedded in a random field and the technique used to determine when and where certain structures are passing, or their averaged characteristics (in the more probable or dominant role sense) is directly related to the definition of the coherent structure. Several methods or approaches are available and the choice of a particular one is generally dependent on the desired informa tion. This choice depends not only on the definition of the structure, but also on the experimental and numerical capabilities available to the researcher.
Structure of the Compressible Turbulent Shear Layer
The large-scale structure of the turbulent compressible shear layer is investigated in a two-stream supersonic wind tunnel through a series of experiments. Double-exposure schlieren photography reveals that the two convective Mach numbers, corresponding to each side of the shear layer, are very different, one sonic or supersonic and the other low subsonic. This contradicts, the current isentropic model of the structure which predicts them to be equal or very close. It is shown that addition of shock-wave effects to that model allows for the asymmetric trends observed in the experiments. An inclined view of the flow provides sketchy information about the spanwise orientation of the large-scale structure and does not reveal any pronounced obliquity. Attempts to enhance mixing by modifying the trailing edge were unsuccessful. (AW).