The Thermal Behavior of Film Cooled Turbulent Boundary Layers as Affected by Longitudinal Vortices.

Abstract

Heat transfer effects of longitudinal vortices embedded within film-cooled turbulent boundary layers on a flat plate were examined for freestream velocities of 10 m/s and 15 m/s, and for blowing ratios ranging from 0.47 to 1.26. Moderate strength vortices were employed having circulation to freestream velocity ratios of about 1.6 cm. Spatially resolved heat transfer measurements from a constant heat flux surface and mean temperature distributions in spanwise planes show that local heat transfer is significantly affected by spanwise vortex position, and blowing ration. Of particular significance are boundary layer and vortex structural changes which occur at high blowing ratios. Keywords: Embedded vortex; Film cooling; Endwall secondary flows.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1987
Accession Number
ADA195155

Entities

People

  • Alfredo Ortiz

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Boundary Layer
  • Data Acquisition
  • Engineering
  • Film Cooling
  • Flow Fields
  • Fluid Mechanics
  • Gas Turbines
  • Geometric Forms
  • Heat Flux
  • Heat Transfer
  • Lines (Geometry)
  • Measurement
  • Mechanical Engineering
  • Three Dimensional
  • Turbines
  • Turbulent Boundary Layer
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Combustion and Flow Dynamics.
  • Fluid Mechanics and Fluid Dynamics.