An Approximate Method for Calculation of the Laminar Boundary Layer with Suction for Bodies of Arbitrary Shape Metadata

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Title

  • Main Title An Approximate Method for Calculation of the Laminar Boundary Layer with Suction for Bodies of Arbitrary Shape
  • Series Title NACA Technical Memorandums

Creator

  • Author: Schlichting, H.
    Creator Type: Personal

Contributor

  • Originator: United States. National Advisory Committee for Aeronautics.
    Contributor Type: Organization

Date

  • Creation: 1949-03-01

Language

  • English

Description

  • Content Description: Various ways were tried recently to decrease the friction drag of a body in a flow; they all employ influencing the boundary layer. One of them consists in keeping the boundary layer Laminar by suction; promising tests have been carried out. Since for large Reynolds numbers the friction drag of the laminar boundary layer is much lower than that of the turbulent boundary layer, a considerable saving in drag results from keeping the boundary layer laminar, even with the blower power required for suction taken into account. The boundary layer is kept laminar by suction in two ways: first, by reduction of the thickness of the boundary layer and second, by the fact that the suction changes the form of the velocity distribution so that it becomes more stable, in a manner similar to the change by a pressure drop. There by the critical Reynolds number of the boundary layer (USigma*/V) (sub crit) becomes considerably higher than for the case without suction. This latter circumstance takes full effect only if continuous suction is applied which one might visualize realized through a porous wall. Thus the suction quantities required for keeping the boundary layer laminar become so small that the suction must be regarded as a very promising auxiliary means for drag reduction.

Subject

  • Keyword: aerodynamics

Collection

  • Name: National Advisory Committee for Aeronautics Collection
    Code: NACA
  • Name: Technical Report Archive and Image Library
    Code: TRAIL

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Rights

  • Rights Access: public
  • Rights License: pd
  • Rights Statement: No Copyright, Unclassified, Unlimited, Publicly available

Resource Type

  • Report

Format

  • Text

Identifier

  • URL: http://hdl.handle.net/2060/20050031104
  • Report No.: NACA-TM-1216
  • Center for AeroSpace Information Number: 20050031104
  • Archival Resource Key: ark:/67531/metadc64833