Plane mixing layers from parallel and non-parallel merging of two streams

Plane mixing layers from parallel and non-parallel merging of two streams Two types of mixing layers produced from two streams merging at 0° and 18° have been investigated. Each type of mixing layer was produced with velocity ratios 0.7, 0.8 and 0.9 and measurements were taken at six streamwise locations. The boundary layers were untripped and initially turbulent in all cases. Both types of mixing layers were found to attain a self-similar state for velocity ratios 0.7 and 0.8 but failed for 0.9 within the measurement domain. It appears that the mixing layer flow becomes self-similar earlier when merging at 18° than at 0°. With increasing velocity ratio, the development distance was increased and the splitter wake played a dominant role in the development of the mixing layers. The mixing layers from non-parallel merging streams (18°) were found to have higher growth in the near-field than those from parallel merging streams (0°). Both types of mixing layers were found to decrease in growth with increasing velocity ratio, though they spread more at the high-speed side. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

Plane mixing layers from parallel and non-parallel merging of two streams

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Publisher
Springer-Verlag
Copyright
Copyright © 2003 by Springer-Verlag
Subject
Engineering; Engineering Fluid Dynamics; Fluids; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s00348-002-0549-x
Publisher site
See Article on Publisher Site

Abstract

Two types of mixing layers produced from two streams merging at 0° and 18° have been investigated. Each type of mixing layer was produced with velocity ratios 0.7, 0.8 and 0.9 and measurements were taken at six streamwise locations. The boundary layers were untripped and initially turbulent in all cases. Both types of mixing layers were found to attain a self-similar state for velocity ratios 0.7 and 0.8 but failed for 0.9 within the measurement domain. It appears that the mixing layer flow becomes self-similar earlier when merging at 18° than at 0°. With increasing velocity ratio, the development distance was increased and the splitter wake played a dominant role in the development of the mixing layers. The mixing layers from non-parallel merging streams (18°) were found to have higher growth in the near-field than those from parallel merging streams (0°). Both types of mixing layers were found to decrease in growth with increasing velocity ratio, though they spread more at the high-speed side.

Journal

Experiments in FluidsSpringer Journals

Published: Mar 19, 2002

References

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