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Rotorcraft downwash flow field study to understand the aerodynamics of helicopter brownout
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Wadcock, Alan J. Ewing, Lindsay A. Solis, Eduardo Rajagopalan, Ganesh Potsdam, Mark |
| Copyright Year | 2008 |
| Description | Rotorcraft brownout is caused by the entrainment of dust and sand particles in helicopter downwash, resulting in reduced pilot visibility during low, slow flight and landing. Recently, brownout has become a high-priority problem for military operations because of the risk to both pilot and equipment. Mitigation of this problem has focused on flight controls and landing maneuvers, but current knowledge and experimental data describing the aerodynamic contribution to brownout are limited. This paper focuses on downwash characteristics of a UH-60 Blackhawk as they pertain to particle entrainment and brownout. Results of a full-scale tuft test are presented and used to validate a high-fidelity Navier-Stokes computational fluid dynamics (CFD) calculation. CFD analysis for an EH-101 Merlin helicopter is also presented, and its flow field characteristics are compared with those of the UH-60. |
| File Size | 4454351 |
| Page Count | 27 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20080046973 |
| Archival Resource Key | ark:/13960/t9964hv02 |
| Language | English |
| Publisher Date | 2008-10-15 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Design, Testing And Performance Sands Military Operations Computational Fluid Dynamics Downwash Risk Visibility Rotary Wing Aircraft Flight Control Helicopter Wakes Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
