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    An Experimental Investigation of the Confluent Boundary Layer on a High-Lift System (1997)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This paper describes a fundamental experimental investigation of the confluent boundary layer generated by the interaction of a leading-edge slat wake with the boundary layer on the main element of a multi-element airfoil model. The slat and airfoil model geometry are both fully two-dimensional. The research reported in this paper is performed in an attempt to investigate the flow physics of confluent boundary layers and to build an archival data base on the interaction of the slat wake and the main element wall layer. In addition, an attempt is made to clearly identify the role that slat wake / airfoil boundary layer confluence has on lift production and how this occurs. Although complete LDV flow surveys were performed for a variety of slat gap and overhang settings, in this report the focus is on two cases representing both strong and weak wake boundary layer confluence.
    Keywords: Aerodynamics
    Type: NASA/CR-97-112979 , NAS 1.26:112979
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Reduction of Helicopter Blade-Vortex Interaction Noise by Active Rotor Control Technology (1997)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Helicopter blade-vortex interaction noise is one of the most severe noise sources and is very important both in community annoyance and military detection. Research over the decades has substantially improved basic physical understanding of the mechanisms generating rotor blade-vortex interaction noise and also of controlling techniques, particularly using active rotor control technology. This paper reviews active rotor control techniques currently available for rotor blade vortex interaction noise reduction, including higher harmonic pitch control, individual blade control, and on-blade control technologies. Basic physical mechanisms of each active control technique are reviewed in terms of noise reduction mechanism and controlling aerodynamic or structural parameters of a blade. Active rotor control techniques using smart structures/materials are discussed, including distributed smart actuators to induce local torsional or flapping deformations, Published by Elsevier Science Ltd.
    Keywords: Aerodynamics
    Type: NASA/TM-97-207568 , NAS 1.15:207568 , Progress in Aerospace Sciences (ISSN 0376-0421); 33; 647-687
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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