Similitude relations for buffet and wing rock on delta wings

Mabey, D. G.

doi:10.1016/s0376-0421(97)00003-1

Cited by 22 publications

(22 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this paper, both co-rotating and counter-rotating trailing vortices have been considered. Another related application is the buffeting of aircraft fins due to the interaction with the leading-edge vortices (Mabey 1997). Flow physics of the various types of vortex-body interactions have been reviewed by Rockwell (1998).…”

Section: Streamwise Vortex-wing Interactionsmentioning

confidence: 99%

Experiments on tip vortices interacting with downstream wings

2018

View full text Add to dashboard Cite

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.

show abstract

Section: Streamwise Vortex-wing Interactionsmentioning

confidence: 99%

Experiments on tip vortices interacting with downstream wings

2018

View full text Add to dashboard Cite

show abstract

“…The universal form of Equation (8) suggests that large-scale separations have global characteristics independent of their particular origin. This inference is confirmed by a review of the experiments on aerofoils, flat plates and delta wings' 23 '. However, the length scale appropriate to delta wings is different from that for aerofoils and flat plates.…”

Section: Some Interesting Developmentsmentioning

confidence: 69%

“…Often low-frequency rigid body modes are excited, e.g. the heave motion of a model on a sting and the rigid body roll mode corresponding to 'wing rock'< 23 aircraft (for the Lockheed Martin F-16 see Ref. 88).…”

Section: Separated Flow Aerodynamicsmentioning

confidence: 99%

See 1 more Smart Citation

Unsteady aerodynamics: retrospect and prospect

Mabey¹

1999

Aeronaut. j.

View full text Add to dashboard Cite

show abstract

“…Therefore influence of this factor on vortex breakdown is predictable enough. The second one is sensitivity of vortex flow to freestream disturbances [2]. The later is more dangerous as it can lead to sudden lift decreasing and moreover to appearance of roll moment.…”

Section: Introductionmentioning

confidence: 99%