The ground vortex formed by a jet impinging on the ground in the presence of a cross flow has been studied experimentally. High speed motion pictures and spectral measurements were obtained to study the unsteady features of this flowfield. A very low frequency “puffing” action was observed. Since this unsteadiness could not be correlated with any other oscillations in the flowfield, the low frequency oscillations must come from the gross features of the ground vortex itself. Namely, jet fluid accumulates in the ground vortex until the vortex is so large that the flowfield breaks up, the ground vortex is swept away, a new smaller vortex forms, and the process repeats itself.
Citation: Cimbala, J., Gaublomme, D., Stinebring, D., and Billet, M., "Experiments on the Unsteady Ground Vortex," SAE Technical Paper 892281, 1989, https://doi.org/10.4271/892281. Download Citation
Author(s):
John M. Cimbala, Donald P. Gaublomme, David R. Stinebring, Michael L. Billet
Affiliated:
The Pennsylvania State University Applied Research Laboratory State College, PA
Pages: 10
Event:
Aerospace Technology Conference and Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
SAE Transactions Journal of Aerospace-V98-1
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