Investigating the Impacts of Particle Size and Wind Speed on Brownout
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
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 26, 2015
- Accession Number
- ADA614925
Entities
People
- Brandy A. Swanson
Organizations
- Air Force Institute of Technology