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  • 1
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    The Vortex Lattice Method for the Rotor-Vortex Interaction Problem (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The rotor blade-vortex interaction problem and the resulting impulsive airloads which generate undesirable noise levels are discussed. A numerical lifting surface method to predict unsteady aerodynamic forces induced on a finite aspect ratio rectangular wing by a straight, free vortex placed at an arbitrary angle in a subsonic incompressible free stream is developed first. Using a rigid wake assumption, the wake vortices are assumed to move downsteam with the free steam velocity. Unsteady load distributions are obtained which compare favorably with the results of planar lifting surface theory. The vortex lattice method has been extended to a single bladed rotor operating at high advance ratios and encountering a free vortex from a fixed wing upstream of the rotor. The predicted unsteady load distributions on the model rotor blade are generally in agreement with the experimental results. This method has also been extended to full scale rotor flight cases in which vortex induced loads near the tip of a rotor blade were indicated. In both the model and the full scale rotor blade airload calculations a flat planar wake was assumed which is a good approximation at large advance ratios because the downwash is small in comparison to the free stream at large advance ratios. The large fluctuations in the measured airloads near the tip of the rotor blade on the advance side is predicted closely by the vortex lattice method.
    Keywords: AERODYNAMICS
    Type: NASA-CR-2421
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Experimental study of rotor unsteady airloads due to blade-vortex interaction (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Measurements of unsteady, rotary wing air loads and time derivatives for rotor blade intersecting completely rolled up vortex
    Keywords: AERODYNAMICS
    Type: NASA-CR-1909 , PSU-AERSP-71-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Effect of Wing Tip Configuration on the Strength and Position of a Rolled-Up Vortex (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Effect of wing tip configuration on strength and position of rolled-up vortex
    Keywords: AERODYNAMICS
    Type: NASA-CR-66916
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    The effect of a drooped wing tip on its trailing vortex system (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Drooped wing tip effects on trailing vortex sheet structure and position from spanwise load distribution determination by vortex lattice theory
    Keywords: AERODYNAMICS
    Type: AIRCRAFT WAKE TURBULENCE AND ITS DETECTION SYMPOSIUM; Sep 01, 1970 - Sep 03, 1970; SEATTLE, WA
    Format: text
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    NASA TECHNICAL REPORTS
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