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  • 1
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    Effect of compliant wall motion on turbulent boundary layers (1977)
    American Institute of Physics
    Details
    Publication Date: 1977-01-01
    Print ISSN: 0031-9171
    Topics: Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 2
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    Model of drag reduction by compliant walls (1977)
    American Institute of Physics
    Details
    Publication Date: 1977-01-01
    Print ISSN: 0031-9171
    Topics: Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 3
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    Laminar flow control - Introduction and overview (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A development history and a development-trends evaluation are presented for laminar flow controlled airfoil technologies and design concepts, including the search for 'natural' laminar flow and actively controlled flow via suction through small pores on the airfoil surface. While most NASA activities in this field have been concerned with subsonic aircraft, it has been projected that the control of boundary layer turbulence may be even more critical to the aerodynamic efficiency of supersonic aircraft. Developmental programs for these techniques have been conducted with several modified conventional aircraft.
    Keywords: AERODYNAMICS
    Type: In: Natural laminar flow and laminar flow control (A93-41776 17-02); p. 1-21.
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Overview of the Langley viscous drag reduction program (1986)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: As a result of reductions in form drag and roughness drag, skin friction, drag, or viscous drag now represents a major contributor to the cruise drag of subsonic business and transport aircraft, and hence, is considered a barrier problem to further significant improvements in the aerodynamic efficiency of these aircraft. To meet the challenge, research in the areas of laminar-flow control and turbulence control/drag reduction was initiated at NASA Langley Research Center. The significance of this research is discussed.
    Keywords: AERODYNAMICS
    Type: Langley Symposium on Aerodynamics, Volume 1; p 393-399
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Viscous drag reduction via surface mass injection (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Slot injection systems on the surfaces of aerodynamic bodies have been noted to consistently furnish substantial local skin friction reductions which are predictable on the basis of current numerical methods. Only crude systems studies, however, have been thus far completed. The most common configuration for slot ingestion in the literature involves tangential injection of air along a two-dimensional surface on which air constitutes the mainstream flow; attention is presently given to slot injection in low-speed and high-speed flows, as well as a discussion of aircraft applications and an evaluation of prospective possibilities for practical drag-reduction systems.
    Keywords: AERODYNAMICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Dragging down fuel costs (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: It has been suggested that modest reductions in friction drag could save U.S. airlines $200-500 million a year. Potentially significant fuel savings are to be expected from laminar flow control (LFC) with suction surfaces on a CTOL subsonic transport; fuel savings from 25 to 40 percent are possible, depending on stage length. NASA has developed advanced computational design tools and methodology, subsonic and transonic NLF (natural laminar flow) and LFC airfoils, practical laminar wing construction techniques, and practical leading-edge treatments applicable to civil and military transports. It is concluded that skin-friction and induced drag approaches can combine to make a 50 percent reduction a reality for commercial and military aircraft of the future.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Aerospace America (ISSN 0740-722X); 26; 14-16
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Viscous drag reduction in boundary layers (1990)
    In:  Other Sources
    Details
    Publication Date: 2016-03-09
    Description: The present volume discusses the development status of stability theory for laminar flow control design, applied aspects of laminar-flow technology, transition delays using compliant walls, the application of CFD to skin friction drag-reduction, active-wave control of boundary-layer transitions, and such passive turbulent-drag reduction methods as outer-layer manipulators and complex-curvature concepts. Also treated are such active turbulent drag-reduction technique applications as those pertinent to MHD flow drag reduction, as well as drag reduction in liquid boundary layers by gas injection, drag reduction by means of polymers and surfactants, drag reduction by particle addition, viscous drag reduction via surface mass injection, and interactive wall-turbulence control.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Combined riblet and lebu drag reduction system (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The invention is a system of flow control devices which result in reduced skin friction on aerodynamic and hydrodynamic surfaces. The devices cause a breakup of large-scale disturbances in the boundary layer of the flow field. The riblet device acts to reduce disturbances near the boundary layer wall by the use of longitudinal striations forming V-shaped grooves. These grooves are dimensional on the order of the wall vortices and turbulent burst dimensions. The large eddy breakup device is a small strip or airfoil which is suspended in the upper region of the boundary layer. Various physical mechanisms cause a disruption of the large-scale vortices. The combination of the devices of this invention result in a substantial reduction in skin friction drag.
    Keywords: AERODYNAMICS
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Research in Natural Laminar Flow and Laminar-Flow Control, part 3 (1987)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Part 3 of the Symposium proceedings contains papers addressing advanced airfoil development, flight research experiments, and supersonic transition/laminar flow control research. Specific topics include the design and testing of natural laminar flow (NLF) airfoils, NLF wing gloves, and NLF nacelles; laminar boundary-layer stability over fuselage forebodies; the design of low noise supersonic/hypersonic wind tunnels; and boundary layer instability mechanisms on swept leading edges at supersonic speeds.
    Keywords: AERODYNAMICS
    Type: NASA-CP-2487-PT-3 , L-16350-PT-3 , NAS 1.55:2487-PT-3 , Mar 16, 1987 - Mar 19, 1987; Hampton, VA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Research in Natural Laminar Flow and Laminar-Flow Control, part 2 (1987)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Part 2 of the Symposium proceedings includes papers addressing various topics in basic wind tunnel research/techniques and computational transitional research. Specific topics include: advanced measurement techniques; laminar flow control; Tollmien-Schlichting wave characteristics; boundary layer transition; flow visualization; wind tunnel tests; flight tests; boundary layer equations; swept wings; and skin friction.
    Keywords: AERODYNAMICS
    Type: NASA-CP-2487-PT-2 , L-16350-PT-2 , NAS 1.55:2487-PT-2 , Mar 16, 1987 - Mar 19, 1987; Hampton, VA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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