Accession Number:

ADA614925

Title:

Investigating the Impacts of Particle Size and Wind Speed on Brownout

Descriptive Note:

Master's thesis

Corporate Author:

AIR FORCE INSTITUTE OF TECHNOLOGY WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT

Personal Author(s):

Report Date:

2015-03-26

Pagination or Media Count:

60.0

Abstract:

The impact of particle size and wind speed on brownout cloud development was investigated among various rotary aircraft using Continuum Dynamics, Inc. CDI Brownout Analysis Tool, a high physical delity brownout model that is used by both U.S. Army Aviation and NASA for Rotorwash analysis. Simulations were run over 125 di erent combinations of particle size, wind speed, and aircraft type then output data was post-processed to determine a transmissivity and ultimately a visibility value that could be used in developing a severity metric for the brownout clouds generated. For most aircraft types evaluated, stronger wind speeds and smaller particle diameters resulted in denser clouds. Wind speeds greater than 6 m s -1 were required to lift particles greater than 30 micrometers in diameter in most cases

Subject Categories:

  • Helicopters
  • Meteorology
  • Electric Power Production and Distribution

Distribution Statement:

APPROVED FOR PUBLIC RELEASE