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A Note about Self-Induced Velocity Generated by a Lifting-Line Wing or Rotor BladeThis report presents an elementary analysis of the induced velocity created by a field of vortices that reside in the wake of a rotor blade. Progress achieved by other researchers in the last 70 years is briefly reviewed. The present work is presented in four stages of complexity that carry a lifting-line representation of a fixed wing into a single-blade rotor. The analysis leads to the conclusion that the lifting rotor's spiraling vortex wake structure has very high induced power when compared to the ideal wing. For an advanced ratio of one-half, induced power is on the order of 10 times that of the wing when the comparison is made at wingspan equal to rotor diameter and wing and rotor having equal lift.
Document ID
20060026344
Acquisition Source
Ames Research Center
Document Type
Contractor Report (CR)
Authors
Harris, Franklin D.
(Maryland Univ. College Park, MD, United States)
Date Acquired
September 7, 2013
Publication Date
February 1, 2006
Subject Category
Aerodynamics
Report/Patent Number
Rept-A-050006
NASA/CR-2006-213478
Funding Number(s)
CONTRACT_GRANT: NAG2-1597
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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