On the evolution of large scale structures in three-dimensional mixing layers |
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Authors: | Luo Jisheng H E Fiedler |
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Institution: | (1) Department of Mechanics, Tianjin University, 300072 Tianjin, China;(2) Hermann-Foetinger-Institute, Technical University, Berlin, Germany |
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Abstract: | In this paper, several mathematical models for the large scale structures in some special kinds of mixing layers, which might
be practically useful for enhancing the mixing, are proposed. First, the linear growth rate of the large scale structures
in the mixing layers was calculated. Then, using the much improved weakly non-linear theory, combined with the energy method,
the non-linear evolution of large scale structures in two special mixing layer configurations is calculated. One of the mixing
layers has equal magnitudes of the upstream velocity vectors, while the angles between the velocity vectors and the trailing
edge were π/2-φ and π/2+φ, respectively. The other mixing layer was generated by a splitter-plate with a 45-degree-sweep trailing
edge.
The project supported by the National Natural Science Foundation of China (19642001) and Deutsche Forschungsgemeinschaft (DFG) |
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Keywords: | mixing layer large scale structure modified weakly non-linear theory energy method passive control |
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