Experimental study on large-scale structures in plane mixing layers

X. L. Xie; W. W. Mar; H. L. Zhou

doi:10.1117/12.468777

29 May 2002 Experimental study on large-scale structures in plane mixing layers

X. L. Xie, W. W. Mar, H. L. Zhou

Proceedings Volume 4537, Third International Conference on Experimental Mechanics; (2002) https://doi.org/10.1117/12.468777
Event: Third International Conference on Experimental Mechanics, 2002, Beijing, China

Abstract

The discovery of large-scale structures termed as spanwise vortices in the middle seventies last century may be the origin of the study of coherent structures. Until now, however, the puzzle-Do large-scale structures exist in fully developed turbulence-is still open, and the controversy about the effect of the initial disturbances on the spatial evolution of large-scale structures in plane mixing layers does not attain a conclusion. We studied these problems to a certain extend by flow visualizations. A kind of the streamwise structures termed as helical structures was widely discovered in plane mixing layers in our experiments. This streamwise structure was also discovered in the low Reynolds number round jets numerically and in the countercurrent axisymmetric shear flows experimentally, and its spatial evolution has nothing to do with the flow fields-plane or axisymmetric mixing.

Citation Download Citation

X. L. Xie, W. W. Mar, and H. L. Zhou "Experimental study on large-scale structures in plane mixing layers", Proc. SPIE 4537, Third International Conference on Experimental Mechanics, (29 May 2002); https://doi.org/10.1117/12.468777

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