ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Four-vortex system reconstruction and experimental study of its wake features
Received date: 2014-10-24
Revised date: 2015-01-09
Online published: 2015-01-19
Supported by
National Natural Science Foundation of China (11072206)
The aircraft wake vortex is a coherent flow phenomenon due to the lift generation mechanism, which threatens the flight safety and limits airport operation efficiency. By mounting a vortex generator onto the wingtip of a rectangular airfoil, a secondary vortex that rotated reversely to the primary vortex is produced, thereby constructing a self-destructed four-vortex system to accelerate the dissipation of the primary vortex. Combined with flow visualizations and particle image velocimetry(PIV) measurements, a parametric study of the spatial evolution and vorticity development of the four-vortex system in 25 wingspans, as well as the circulation reduction rate in 45 wingspans, is conducted. The results exhibit that the interaction instability of the wake vortex is triggered by the secondary vortex in advance, resulting in the premature breakdown of the primary vortex, resulting in the decline of its vorticity. As the initial circulation ratio is -0.581 and the initial distance ratio is 0.5, the circulation of the primary vortex is reduced most significantly (34.7%) in 45 wingspans.The results would provide a scheme for the design of airfoils with weaker vortices.
Key words： four-vortex system; aircraft wake; vortex generator; flow visualization; PIV
BAO Feng , ZHU Rui , LIU Zhirong , HE Yi . Four-vortex system reconstruction and experimental study of its wake features[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015 , 36(5) : 1491 -1499 . DOI: 10.7527/S1000-6893.2015.0013
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