A Summary of Flowfield Around a Rotor Blade in Reverse Flow
Nandeesh Hiremath, Dhwanil Shukla, Vrishank Raghav, Narayanan Komerath, Georgia Institute of Technology
May 17, 2016
A Summary of Flowfield Around a Rotor Blade in Reverse Flow
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- 8 pages
- SKU # : 72-2016-255
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A Summary of Flowfield Around a Rotor Blade in Reverse Flow
Authors / Details: Nandeesh Hiremath, Dhwanil Shukla, Vrishank Raghav and Narayanan Komerath, Georgia Institute of TechnologyAbstract
Prior work from our group presented 3-D velocity field measurements obtained using stereo particle image velocimetry (SPIV) under the sharp edge of a rotor blade in reverse flow. These showed the presence of a strong attached vortex reminiscent of that over a sharp-edged delta wing at angle of attack. The evolution of this sharp edge vortex (SEV) as the blade moves with decreasing yaw, dominates the aerodynamics of the blade in reverse flow. In this paper, we report new measurements that complete the picture. Data below the rotor blade, sufficiently resolved in space to permit interpolation to satisfy the continuity equation, enable extraction of the surface pressure field and the local circulation. This paper closes the loop and shows why a model of reversed flow rotor aerodynamics based on the formation and evolution of a strong sharp-edged vortex resolves several mysteries and provide a self-consistent explanation of observed phenomena. Further, logical argument shows that this test case is physically representative of what will be encountered on full-scale blades in flight.
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A Summary of Flowfield Around a Rotor Blade in Reverse Flow
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