The Langley 8-ft Transonic Pressure Tunnel Laminar-Flow-Control Experiment

Background and Accomplishments
  • Percy J. Bobbitt
  • William D. Harvey
  • Charles D. Harris
  • Cuyler W. BrooksJr.
Part of the ICASE/NASA LaRC Series book series (ICASE/NASA)


The NASA’s response to the oil shortage and price increases of the 70’s was the creation of the Aircraft Energy Efficiency (ACEE) Program. Its objective was to provide aerodynamic and controls technology that would enable the design of commercial transports with substantially better fuel efficiency than those in service at the time. This program had a number of facets, most of which were centered on supercritical airfoil/wing and winglet technology, and included both industry and NASA in-house research components. This paper concerns one of the NASA in-house activities, the Langley Laminar Flow Control (LFC) Project, which was carried out in the Langley 8-foot Transonic Pressure Tunnel (8-ft TPT). The idea for such an undertaking came from Dr. Werner Pfenninger in 1975 and stemmed, primarily, from a desire to know more about the compatability of a high performance supercritical wing with laminar flow control. The possible adverse effect of a large supersonic zone and its associated wave structure on the stability of a suction controlled boundary layer was a particular concern.


Mach Number Wind Tunnel Unit Reynolds Number Perforated Model Trail Edge Flap 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



NASA’ Aircraft Energy Efficiency Program


NASA Ames Research Center


atmospheric pressure, 14.7 psi




hybrid laminar flow control




leading edge


laminar flow control


NASA Langley Research Center


NASA Langley Low Turbulence Pressure Tunnel


reference suction level ( = CQ/CQref)


trailing edge



8-ft TPT

NASA Langley 8-ft Transonic Pressure Tunnel

12-ft PT

NASA Ames 12-ft Pressure Tunnel


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Copyright information

© Springer-Verlag New York, Inc. 1992

Authors and Affiliations

  • Percy J. Bobbitt
    • 1
  • William D. Harvey
    • 1
  • Charles D. Harris
    • 1
  • Cuyler W. BrooksJr.
    • 1
  1. 1.Langley Research CenterHamptonUSA

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