Investigation of the Effect of Duct Configuration on Shrouded Propellers PDF Download
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Author: Susan Elizabeth Flint
Publisher:
ISBN:
Category :
Languages : en
Pages : 98
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Author: Susan Elizabeth Flint
Publisher:
ISBN:
Category :
Languages : en
Pages : 98
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Author: Kenneth W. Goodson
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 52
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"An investigation of the aerodynamic characteristics of a powered semispan tilting-shrouded-propeller configuration has been conducted in the 17-foot test section of the Langley 300-MPH 7- by 10-foot tunnel. The wing had an aspect ratio of 2.67 (based on wing span of 60 inches), a taper ratio of 0.67, and an NACA 2418 airfoil section with a 15-inch-diameter shrouded propeller mounted on the tip. The test results show that large nose-up pitching moments are obtained at transitional speeds of about 40 knots and duct angle of about 70°. Decelerating flight procedures further increases in the nose-up moment. Ground proximity reduces the nose-up pitching moments. The large nose-up moments can be trimmed by use of duct-exit control vanes. The results show that unloading the duct (shroud) by flying at a wing angle of attack of 15° reduces the power required by about 30 percent at 50 knots. Duct-lip stall produces large increases in power required. The results in general show that full-scale aerodynamic simulation can be made with small-scale wind-tunnel models if duct-lip separation at low Reynolds numbers is avoided."--Summary.
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1076
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Author: Kalman J. Grunwald
Publisher:
ISBN:
Category : Propulsion systems
Languages : en
Pages : 36
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 702
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 446
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Author:
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Category : Government publications
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 780
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Author: Defense Documentation Center (U.S.)
Publisher:
ISBN:
Category : Military art and science
Languages : en
Pages : 1540
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Author: United States. National Aeronautics and Space Administration. Scientific and Technical Information Division
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 258
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