An experimental study of the formation and unsteady characteristics of inlet vortices


Wang, Z. and Gursul, I., 2011. An experimental study of the formation and unsteady characteristics of inlet vortices. In: 49th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition. Reston, U. S. A.: American Institute of Aeronautics and Astronautics.

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An experimental study of the unsteady characteristics of inlet vortices has been conducted using a high frame rate digital particle image velocimetry (DPIV) system. The results revealed the formation of a pair of counter rotating inlet vortices for no crosswind configuration and one single inlet vortex when there was crosswind. Near ground surface flow measurements confirmed that inlet vortex was originated from the separation point on the ground. In all measurement planes, including near the ground plane, evidence of vortex meandering with quasi-periodicity was found. The vortex meander amplitude increases with crosswind velocity. The proper orthogonal decomposition (POD) analysis of the captured instantaneous flow structures suggested that the most energetic mode was a helical displacement wave, corresponding to the first helical mode.


Item Type Book Sections
CreatorsWang, Z.and Gursul, I.
DepartmentsFaculty of Engineering & Design > Mechanical Engineering
Research CentresAerospace Engineering Research Centre
ID Code28069
Additional InformationID number: AIAA-2011-988


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