Measurements of Jet Dispersions Simulated in an Aeronautical Wind Tunnel.

Abstract

A neutrally stable atmospheric surface layerr was suitably simulated in a low speed wind tunnel by tripping the boundary laye with a fence and letting the turbulent flow develop over a length of roughness elements. Jet exhaust disperion characteristics, simulated by a burner/nozzle system, were investigated by measuring the horizontal and vertical temperature profiles at axial stations downwind from the nozzle exit. Dispersion sensitivity to different nozzle exit conditions, angles of incidence to the wind, the nozzle surface blockage were investigated. The results were compared to disperison methods used in the Air Quality Assessment Model (AQAM). It was found that the experimental jet penetration length was much shorter than that assumed in AQAM, and that a plume rise existed, which is not included in the current AQAM model. Required inputs of the initial dispersion coefficients were determined as a function of wind direction. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1979
Accession Number
ADA076578

Entities

People

  • Jack Vernon Brendmoen

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms
  • Biomedical
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Angle Of Incidence
  • Boundary Layer
  • Coefficients
  • Dispersions
  • Distribution Curves
  • Engineering
  • Fluid Mechanics
  • Jet Aircraft
  • Mach Number
  • Measurement
  • Normal Distribution
  • Pressure Gradients
  • Turbojet Engines
  • Turbulence
  • Turbulent Mixing
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Combustion and Flow Dynamics.
  • Computational Modeling and Simulation