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Direct periodic solutions of rotor free wake calculations

Publication ,  Journal Article
Miller, WO; Bliss, DB
Published in: Journal of the American Helicopter Society
January 1, 1993

Periodic Inversion is a new approach for the calculation of rotor free wakes which solves directly for periodically steady-state solutions, at all advance ratios including low speed and hover. This is a unique capability as traditional time marching solutions can fail to converge at low advance ratios. The method is based on enforcing a periodic boundary condition on the wake over one rotor revolution. The resulting system of nonlinear equations is linearized, then iteratively solved for perturbative corrections to the wake geometry. The method is used to examine the low speed wake structure, which exhibits three distinct forms depending on advance ratio: a helical structure from hover to some lower bound advance ratio, a roll-up structure above some higher bound advance ratio, and a rapid transition region between the two. Performance curves are generated by varying trim parameters between iterations.

Duke Scholars

Published In

Journal of the American Helicopter Society

DOI

ISSN

0002-8711

Publication Date

January 1, 1993

Volume

38

Issue

2

Start / End Page

53 / 60

Related Subject Headings

  • Aerospace & Aeronautics
  • 4017 Mechanical engineering
  • 4012 Fluid mechanics and thermal engineering
  • 4001 Aerospace engineering
  • 0913 Mechanical Engineering
  • 0901 Aerospace Engineering
 

Citation

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Miller, W. O., & Bliss, D. B. (1993). Direct periodic solutions of rotor free wake calculations. Journal of the American Helicopter Society, 38(2), 53–60. https://doi.org/10.4050/jahs.38.53
Miller, W. O., and D. B. Bliss. “Direct periodic solutions of rotor free wake calculations.” Journal of the American Helicopter Society 38, no. 2 (January 1, 1993): 53–60. https://doi.org/10.4050/jahs.38.53.
Miller WO, Bliss DB. Direct periodic solutions of rotor free wake calculations. Journal of the American Helicopter Society. 1993 Jan 1;38(2):53–60.
Miller, W. O., and D. B. Bliss. “Direct periodic solutions of rotor free wake calculations.” Journal of the American Helicopter Society, vol. 38, no. 2, Jan. 1993, pp. 53–60. Scopus, doi:10.4050/jahs.38.53.
Miller WO, Bliss DB. Direct periodic solutions of rotor free wake calculations. Journal of the American Helicopter Society. 1993 Jan 1;38(2):53–60.

Published In

Journal of the American Helicopter Society

DOI

ISSN

0002-8711

Publication Date

January 1, 1993

Volume

38

Issue

2

Start / End Page

53 / 60

Related Subject Headings

  • Aerospace & Aeronautics
  • 4017 Mechanical engineering
  • 4012 Fluid mechanics and thermal engineering
  • 4001 Aerospace engineering
  • 0913 Mechanical Engineering
  • 0901 Aerospace Engineering