| 摘要 |
A method of improving aerodynamic performance of foils by the application of conformal, elastomeric vortex generators. The novel use of elastomers allows the application of various forms of vortex generators to sections that have been problematic from engineering and cost considerations. A novel and efficient vortex generator profile is identified, which develops an additional co rotating vortex at low energy expenditure. The mechanisms allow for the application of transverse vortex generators, or Gurney Flaps/Lift Enhancement Tabs/Divergent Trailing Edges, to propellers, rotorblades, and to wings/flaps/control trailing edges. Cove Tabs are additionally described using an elastomeric transverse vortex generator to achieve performance improvements of a high lift device. |
| 主权项 |
1. An application of passive, flexibly attached geometry, elastomeric vortex generators lift enhancement tabs for improving flow on a foil or series of foils, thereby improving lift, drag, angle of attack capability or lift to drag ratios, comprising:
passive means for providing an element for forming transverse vortices, and a base surface for attachment to a foil or aero/hydrodynamic surface, wherein said passive means for providing an element for forming said transverse vortices is elastomeric and is configured to be bonded to the foil or aero/hydrodynamic surface, said passive means further comprising a front surface configured at an angle normal to a free stream aero/hydrodynamic flow to generate a first vortex, and a rear surface configured at an angle normal to said free stream aero/hydrodynamic flow to generate a second vortex, whereby said passive means body is configured for force balance between said first and second vortex forces so as to provide minimum force loading on said base surface, and said first and second vortices are configured to reenergize a downstream boundary layer, improving lift, drag, angle of attack capability or lift to drag ratios. |
