A Method for Determining the Point of Lift-Off and Modified Trajectory of a Ground-Based Heated Turbulent Planar Jet in a Co-Flowing Wind.

Abstract

Experimental and theoretical programs are being conducted to aid in the development of an operational Warm Fog Dispersal System using ground based heat sources. To help determine optimum heat and thrust combinations for the system, investigations have been made of the buoyant motion of heated turbulent jets in co-flowing; that is, same direction ambient winds. To take account of the ground effect, an analysis has been made of the experimental data for the planar jet at the point of lift-off in terms of the local Froude number at this point. From this correlation a procedure has been developed for determining the lift-off point, using the ambient wind and initial velocity and temperature of the jet as input variables. A new jet trajectory may now be easily calculated with only a simple modification of the original method in which the ground effect was ignored.

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Document Details

Document Type
Technical Report
Publication Date
Feb 02, 1977
Accession Number
ADA040704

Entities

People

  • Milton M. Klein

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • C4I
  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Agreements
  • Air Force
  • Buoyancy
  • Control Systems
  • Experimental Data
  • Field Tests
  • Froude Number
  • Geophysics
  • Ground Based
  • Ground Effect
  • Security
  • Trajectories
  • Wind
  • Wind Velocity

Fields of Study

  • Engineering
  • Physics

Readers

  • Explosive Engineering.
  • Fluid Mechanics and Fluid Dynamics.
  • Thermal Physics or Thermal Science.