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Advisor(s)
Abstract(s)
The complex flow field generated by the impact of twin impinging jets in tandem through a low velocity crossflow was numerically studied. The Reynolds number based on the jet exit conditions was 43,000, the jet-to-crossflow velocity ratio from 7.5 to 90, and an interject spacing of 6 diameters of the jet. The impingement heights used were 3 to 15. The mathematical model used is based on the solution of the continuity and momentum equations. A RANS formulation was adopted with the “k-ε” turbulent model to represent the turbulent stresses. The numerical results showed the influence of the impingement height on the ground vortex location, size and interaction with the surrounding flow, but new aspects of this type of flows were found for the present case of a tandem configuration. In the region between the jets the usual fountain upwash flow does not occur, but a second small ground vortex was detected for H/D≤10, due to the interaction between the wall jets of each impinging jet. To our knowledge this is a new phenomenon that is being reported in the literature for the very first time.
Description
Copyright © 2017 by Jorge M. M. Barata, André R. R. Silva and Diana F. C. Vieira. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.
AIAA SciTech Forum
Keywords
Jets Aircraft landing VSTOL Velocity ratios
Citation
Publisher
American Institute of Aeronautics and Astronautics