Theoretical and Experimental Investigation of a Low Speed Propeller PDF Download
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Author: Scott William Sprehn
Publisher:
ISBN:
Category :
Languages : en
Pages : 120
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Author: Scott William Sprehn
Publisher:
ISBN:
Category :
Languages : en
Pages : 120
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Book Description
Author: K. D. Korkan
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
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Author: Roland Helmut.* Lorenz
Publisher:
ISBN:
Category :
Languages : en
Pages : 178
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Book Description
Author: John E. Baker
Publisher:
ISBN:
Category : Aerofoils
Languages : en
Pages : 686
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Book Description
The highest flutter speeds were found in the vicinity of the angle of zero aerodynamic moment and the flutter speed increased considerably in this region with decreasing pressure. Over the rest of the pitch range, the flutter speeds were much lower and varied little with pressure.
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781725626317
Category :
Languages : en
Pages : 34
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Models of supersonic propellers were previously tested for acoustics in the Lewis 8- by 6-Foot Wind Tunnel using pressure transducers mounted in the tunnel ceiling. The boundary layer on the tunnel ceiling is believed to refract some of the propeller noise away from the measurement transducers. Measurements were made on a plate installed in the wind tunnel which had a thinner boundary layer than the ceiling boundary layer. The plate was installed in two locations for comparison with tunnel ceiling noise data and with fuselage data taken on the NASA Dryden Jetstar airplane. Analysis of the data indicates that the refraction increases with: increasing boundary layer thickness; increasing free stream Mach number; increasing frequency; and decreasing sound radiation angle (toward the inlet axis). At aft radiation angles greater than about 100 deg there was little or no refraction. Comparisons with the airplane data indicated that not only is the boundary layer thickness important but also the shape of the velocity profile. Comparisons with an existing two-dimensional theory, using an idealized shear layer to approximate the boundary layer, showed that the theory and data had the same trends. Analysis of the data taken in the tunnel at two different distances from the propeller indicates a decay with distance in the wind tunnel at high Mach numbers but the decay at low Mach numbers is not as clear. Dittmar, J. H. and Burns, R. J. and Leciejewski, D. J. Glenn Research Center NASA-TM-83764, E-2257, NAS 1.15:83764 RTOP 535-03-12...
Author: Ronald J. Weetman
Publisher:
ISBN:
Category :
Languages : en
Pages : 78
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The paper describes the past theoretical and experimental work on ducted propellers. Also included is a discussion of the limitations of these past investigations. Since the ducted propeller is used parimarily for low speed applications (i.e., deep sea submersibles, tugboats and VTOL's) the theoretical and experimental development for low speed and static conditions is obviously needed. A description of the current and proposed theoretical and experimental investigation for these conditions is presented. (Author).
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 996
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 620
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Author:
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ISBN:
Category : Weights and measures
Languages : en
Pages : 248
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Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 628
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