Preliminary Experimental Study of Disturbances in a Laminar Boundary- Layer due to Distributed Surface Roughness

Abstract

Mean flow and disturbance measurements have been made on a flat plate model, one meter long in the CWRU low speed wind tunnel using hot-wire anemometry. Tests were conducted on a smooth plate and with two different grades of sandpaper covering; first with a sandpaper covering giving Re sub K values centered around 10 and then with a coarser sandpaper have Re sub K values of about 150. The mean flow measurements indicated Blasius profiles for the smooth plate and with the finer roughness. With the coarser roughness the profile was best approximated by a Blasius profile at the early stations but then progressed toward a turbulent profile.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1981
Accession Number
ADA102072

Entities

People

  • Eli Reshotko
  • Leon Leventhal

Organizations

  • Case Western Reserve University

Tags

Communities of Interest

  • Energy and Power Technologies
  • Materials and Manufacturing Processes
  • Sensors

DTIC Thesaurus Topics

  • Air Force
  • Boundary Layer
  • Free Stream
  • Frequency
  • Frequency Bands
  • Hot Wire
  • Hot Wire Anemometers
  • Laminar Boundary Layer
  • Leading Edges
  • Measurement
  • Pressure Distribution
  • Pressure Gradients
  • Pressure Measurement
  • Surface Roughness
  • Test Facilities
  • Two Dimensional
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.
  • Powder metallurgy of Titanium alloys.