Trailing vortex effects on large receiver aircraft

Bloy, A. W.; Jouma'a, M.

doi:10.2514/3.46864

Cited by 6 publications

(1 citation statement)

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“…We designate this as the interaction of the "counter-rotating vortex" with the wing. The case of interaction of co-rotating vortex with a downstream wing is relevant to flight refueling (Bloy and Jouma'a 1995) as well as to canard-wing-vortex interactions (Erickson et al 1990). In this paper, both co-rotating and counter-rotating trailing vortices have been considered.…”

Section: Streamwise Vortex-wing Interactionsmentioning

confidence: 99%

Experiments on tip vortices interacting with downstream wings

2018

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The interaction of meandering tip vortices shed from a leading wing with a downstream wing was investigated experimentally in a water tunnel using flow visualization, particle image velocimetry measurements, and volumetric velocity measurements. Counter-rotating upstream vortices may exhibit sudden variations of the vortex core location when the wing-tip separation is within approximately twice the vortex core radius. This is caused by the formation of vortex dipoles near the wing tip. In contrast, co-rotating upstream vortices do not exhibit such sensitivity. Large spanwise displacement of the trajectory due to the image vortex is possible when the incident vortex is further inboard. For both co-rotating and counter-rotating vortices, as long as there is no direct impingement upon the wing, there is a little change in the structure of the time-averaged vortex past the wing, even though the tip vortex shed from the downstream wing may be substantially weakened or strengthened. In the absence of the downstream wing, as well as for weak interactions, the most energetic unsteady modes represent the first helical mode |m| = 1, which is estimated from the three-dimensional Proper Orthogonal Decomposition modes and has a very large wavelength, on the order of 10 2 times the vortex core radius, λ/a = O(10 2). Instantaneous vorticity measurements as well as flow visualization suggest the existence of a smaller wavelength, λ/a = 5-6, which is not among the most energetic modes. These two-orders of magnitude different wavelengths are in agreement with the previous measurements of tip vortices and also exhibit qualitative agreement with the transient energy growth analysis. The very long wavelength mode in the upstream vortex may persist during the interaction, and reveal coupling with the trailing vortex as well as increased meandering.

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Section: Streamwise Vortex-wing Interactionsmentioning

confidence: 99%