Unsteady Stall Penetration Experiments at High Reynolds Number PDF Download
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Author: Peter F. Lorber
Publisher:
ISBN:
Category : Reynolds number
Languages : en
Pages : 206
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Author: Peter F. Lorber
Publisher:
ISBN:
Category : Reynolds number
Languages : en
Pages : 206
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 702
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Author:
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ISBN:
Category : Aerodynamics, Transonic
Languages : en
Pages : 684
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Author: American Institute of Aeronautics and Astronautics
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ISBN:
Category : Aeronautics
Languages : en
Pages : 868
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 388
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Author: International Council of the Aeronautical Sciences. Congress
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ISBN:
Category : Aeronautics
Languages : en
Pages : 1408
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Author:
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ISBN:
Category :
Languages : en
Pages : 62
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The loading of an airfoil during dynamic stall is examined in terms of the augmented lift and the associated penalties in pitching moment and drag. It is shown that once stall occurs and a leading-edge vortex is shed from the airfoil there is a unique relationship between the augmented lift, the negative pitching moment, and the increase in drag. This relationship, referred to here as the dynamic stall function, shows limited sensitivity to effects such as the airfoil section profile and Mach number, and appears to be independent of such parameters as Reynolds number, reduced frequency, and blade sweep. For single-element airfoils there is little that can be done to improve rotorcraft maneuverability except to provide good static clmax characteristics and the chord or blade number that is required to provide the necessary rotor thrust. However, multi-element airfoils or airfoils with variable geometry features can provide augmented lift in some cases that exceeds that available from a single-element airfoil. The dynamic stall function is shown to be a useful tool for the evaluation of both measured and calculated dynamic stall characteristics of singleelement, multi-element, and variable geometry airfoils.
Author:
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Category : Fluid dynamics
Languages : en
Pages : 504
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 664
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Author: United States. National Aeronautics and Space Administration
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages :
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