Vortical Gusts: Experimental Generation and Interaction with Wing
We describe the experimental generation of isolated vortical gusts and the interaction between these gusts and a downstream airfoil at a Reynolds number of 20,000. A standard method of generating a vortical gust has been to rapidly pitch an airfoil. A different approach is presented here: heaving a plate across a tunnel and changing direction rapidly to release a vortex. This method is motivated by the desire to limit a test article's exposure to the wake of the gust generator by moving it to the side of the tunnel. Two suites of experiments were performed to characterize the performance of the gust generators and to measure the forces on and flow around the downstream airfoil. The novel mechanism allowed for measurement of the resumption of vortex shedding from the downstream airfoil, which was impossible with the pitching generator.
© 2019 by Esteban A. L. Hufstedler and Beverley J. McKeon. Published by the American Institute of Aeronautics and Astronautics, Inc. Presented as Paper 2016-4257 at the AIAA 46th AIAA Fluid Dynamics Conference, Washington, D.C., 13–17 June 2016; received 15 November 2017; revision received 18 August 2018; accepted for publication 18 December 2018; published online 29 January 2019. The authors would like to thank the reviewers for their help in significantly improving this manuscript. This research was funded by the Gordon and Betty Moore Foundation through grant GBMF#2645 to the California Institute of Technology.
Published - 1.j056914.pdf