INFLUENCE OF FREE-STREAM TURBULENCE ON HYPERSONIC STAGNATION ZONE HEATING

Abstract

The much ignored problem of turbulence in hypersonic ground test facilities is discussed with particular emphasis on arc-heated facilities. Sources of free-stream turbulence and their effects on model aerodynamics are identified. An analytical treatment of stagnation zone heating accounting for free-stream vorticity amplification and viscous dissipation is presented. Results are discussed in relation to three experiments: one involving time resolved measurements in an arc-heated wind tunnel, another involves stagnation point heat transfer measurements in the turbulent boundary layer of a hypersonic shock tunnel, and the third deals with similar measurements in a turbulent subsonic nitrogen plasma jet. In both of the latter experiments, stagnation point heating rates exceeding two to three times the calculated laminar expectation are reported. These results are corroborated by the present analysis.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1968
Accession Number
AD0671519

Entities

People

  • Thomas M. Weeks

Organizations

  • Flight Dynamics Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Boundary Layer
  • Computational Fluid Dynamics
  • Flow Fields
  • Flow Visualization
  • Fluid Dynamics
  • Fluid Mechanics
  • Free Stream
  • Heat Transfer
  • Measurement
  • Physics Laboratories
  • Plasma Jets
  • Research Facilities
  • Shock Tunnels
  • Stagnation Point
  • Test Facilities
  • Turbulence
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Fluid Dynamics.
  • Fluid Mechanics and Fluid Dynamics.
  • Theoretical Analysis.

Technology Areas

  • Hypersonics
  • Hypersonics - Hypersonic Boundary Layers
  • Hypersonics - Hypersonic Flow