PERSEVERANCE OF A QUASI-2-DIMENSIONAL EDDY-STRUCTURE IN A TURBULENT MIXING LAYER

被引:76
作者
WYGNANSKI, I
OSTER, D
FIEDLER, H
DZIOMBA, B
机构
[1] School of Engineering, Tel-Aviv University, Ramat-Aviv
关键词
D O I
10.1017/S0022112079001920
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
Strong external disturbances were introduced into a mixing layer in order to test the formation of the quasi two-dimensional coherent eddies and their survival under less than ideal conditions. Velocity and temperature correlation measurements, flow visualization, and the simultaneous use of a large number of sensors suggest that these eddies are very stable in the range of Reynolds numbers considered and they persevere in spite of the external buffeting imposed. Some measurements were carried out in a mixing layer between two parallel streams and some in a mixing layer entraining quiescent surrounding fluid. In both cases the large eddies could be described. as vortex rolls spanning the test section; these rolls may be contorted and sometimes skewed, but they are basically two-dimensional. © 1979, Cambridge University Press
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页码:325 / &
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