Obtaining Extremely High Lift to Drag Ratios with Flexible-Wall Turbulence Control | Zendy

Sumon Sinha | Zendy; J.E. Hendrix | Zendy

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Obtaining Extremely High Lift to Drag Ratios with Flexible-Wall Turbulence Control

Author(s) -

Sumon Sinha,

J.E. Hendrix

Publication year - 2009

Publication title -

50th aiaa aerospace sciences meeting including the new horizons forum and aerospace exposition

Language(s) - English

Resource type - Conference proceedings

DOI - 10.2514/6.2009-896

Subject(s) - turbulence , drag , lift (data mining) , aerospace engineering , computer science , physics , mechanics , engineering , data mining

In flight sink-rate measurements of a Standard Cirrus sailplane verified 67-80% increase in average best glide ratio (L/D) by treating 8% of the mean aerodynamic chord of the wing upper surface with a passive Flexible Composite Surface Deturbulator tape. Flow induced long wavelength travelling waves on the flexible surface of the Deturbulator, related to lowfrequency turbulence-producing eddies are periodically perturbed by ridges on the substrate. Flow visualization has verified that this attenuates turbulence and promotes a thin stagnant separated zone on top of the wing. This has resulted in best L/D values over 100 for a 15-m span standard class sailplane. This exceeds performance levels achievable by the usual approach of maximizing the extent of attached laminar flow.

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