Design and analysis of horizontal axis rotor with increased power output due to an array of rotating tip-devices and their mirror images within an axi-symmetric ground-effect generator
- Omega Components Inc., Newport News, VA (United States)
This paper extends applicability of the ground effect theory to the refinement of the rotor-rotating shroud concept. In light of Prandtl`s conformal transformation, the main aerodynamic performances of a wing flying in proximity of the ground and at heights that are less than its single semi-span, will be changed. For example, the lift of a real wing will be equal to the lift of /its ground-generated mirror image wing, whose lift acts in opposite direction, i.e., in direction of the real wing`s lift. According to test substantiation of the theory, a real wing flying in respect to its mirror image generator at the height amounting to 0.21% of its span, has its drag reduced by 20% its lift increased by 20% and its lift to drag ratio increased by 50%. This substantial improvement in performances of the real wing was the main reason for creation of an axisymmetric ground-effect generator of the mirror images of the tip-devices in form of a simple narrow stationary conical surface in space surrounding the rotating shroud.
- OSTI ID:
- 372128
- Report Number(s):
- CONF-960154-; ISBN 0-9648731-8-4; TRN: IM9641%%205
- Resource Relation:
- Conference: Energy Week `96: American Society of Mechanical Engineers and American Petroleum Institute energy week conference and exhibition, Houston, TX (United States), 21 Jan - 2 Feb 1996; Other Information: PBD: 1996; Related Information: Is Part Of Energy week `96: Conference papers. Book 8: Wind energy; PB: 218 p.
- Country of Publication:
- United States
- Language:
- English
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