EXPERIMENTAL RESEARCH ON THE EFFECT OF PRESSURE GRADIENT AND FREE STREAM TURBULENCE ON THE BOUNDARY LAYER OF A FLAT ROUGH PLATE.

Abstract

A determination was made of displacement thickness and momentum loss thickness in the boundary layer of a rough flat plate at low velocities, at various conditions of wall roughness, pressure gradient and free stream turbulence. The opportunity is discussed to assume y = zero at the 'top plane' of the rough surface, taking as additional parameter the flow velocity at the wall. New results are indicated about the slowing down of the stream near the wall, about the turbulence mainly initial effect, about the presence of a boundary layer above the boundary layer, as a consequence of the combined action of pressure gradient and free stream turbulence. (Author)

Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1965
Accession Number
AD0630799

Entities

People

  • Ennio Mattioli

Organizations

  • Polytechnic University of Turin

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Boundaries
  • Boundary Layer
  • Congress
  • Displacement
  • Flow
  • Free Stream
  • Layers
  • Momentum
  • Physical Properties
  • Pressure Gradients
  • Roughness
  • Thickness
  • Turbulence

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • Fluid Mechanics and Fluid Dynamics.