Atmospheric Dispersion of High Velocity Jets.

Abstract

A neutrally stable atmospheric surface layer was simulated in a low speed wind tunnel by tripping the boundary layer with a fence and letting the turbulent flow develop over a length of roughness elements. Turbojet exhaust dispersion 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, and nozzle surface blockage were investigated. The results were compared to dispersion methods used in the Air Quality Assessment Model (AQAM). It was found that (1) the experimental jet penetration length was much shorter than that assumed in AQAM, (2) the horizontal jet exhibited plume rise, (3) the initial dispersion coefficients were a function of wind direction, and (4) the plume spreading rate was more rapid than for the low velocity, elevated sources in neutrally stable atmospheric conditions. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1979
Accession Number
ADA081612

Entities

People

  • David W. Netzer
  • Jack V. Brendmoen

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Biomedical
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Aircrafts
  • Atmospheric Motion
  • Boundary Layer
  • Electronic Equipment
  • Fluid Mechanics
  • Jet Aircraft
  • Measurement
  • Mechanics
  • Navy
  • Nozzles
  • Shear Stresses
  • Simulations
  • Turbojet Engines
  • Turbulence
  • Wind Direction
  • Wind Tunnels

Readers

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