A Numerical Study of Clearing Warm Fog by Using Hygroscopic Seeding in Conjunction with Helicopter Downwash

Abstract

Several techniques for dissipating warm fog have been tried in field experimentation. In an attempt to augment helicopter downwash dissipation efforts, hygroscopic seeding has been suggested. However, because these two techniques work in very different time frames, the question arises as to whether they can be used together simultaneously. By simulating a helicopter downwash profile, a two-dimensional vorticity model is used to determine seeding material concentrations produced as the result of dispensing material into the downwash. Continuous seeding while hovering, pulse seeding while hovering, and the effect of helicopter movement are examined.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1974
Accession Number
AD0781259

Entities

People

  • Paul M. Tag

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Advection
  • Air Force
  • Aircrafts
  • Equations
  • Field Tests
  • Fixed Wing Aircraft
  • Flow
  • Flow Rate
  • Ground Effect
  • Heat Energy
  • Helicopters
  • Inert Materials
  • Military Operations
  • Research Facilities
  • Simulations
  • Steady State
  • Two Dimensional

Readers

  • Atmospheric Remote Sensing.
  • Aviation Science / Aeronautics.
  • Theoretical Analysis.