Turbulent Flow over Rough Turbine Airfoils.

Abstract

A method to analyze turbulent boundary layer over rough turbine vanes or blades is developed. A new formulation of the mixing length model, expressed in the velocity-space variable, is instrumental in the modeling effort, and the surface roughness effect is embedded in an amplification factor as a multiplier to the mixing length. (The amplification factor ranges from unity for a smooth surface upward for rough surfaces, with its variation depending on the type of roughness). For demonstration, the new method is applied to the analysis of turbulent flow over a flat plate with two surface roughnesses. For a plate length with a length Reynolds number of 10 million, skin friction is increased by as much as 60 percent, if the roughness-to-length ratio is 0.0001. Keywords: Turbine blades; Vanes; Surface roughness; Turbulent boundary layer; Skin friction.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1985
Accession Number
ADA163005

Entities

People

  • Lit. S. Han

Organizations

  • Ohio State University

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Air Force
  • Boundary Layer
  • Boundary Layer Flow
  • Computational Fluid Dynamics
  • Computer Programs
  • Engineering
  • Fluid Flow
  • Fluid Mechanics
  • Mechanical Engineering
  • Mechanical Properties
  • Mechanics
  • Pressure Gradients
  • Surface Roughness
  • Turbine Blades
  • Turbines
  • Turbulent Flow
  • Turbulent Mixing

Fields of Study

  • Physics

Readers

  • Combustion and Flow Dynamics.
  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Fluid Mechanics and Fluid Dynamics.

Technology Areas

  • Space
  • Space - Hall-Effect Thruster