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DTIC ADA509010: Rotorcraft Downwash Flow Field Study to Understand ... |
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by Defense Technical Information Center |
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Rotorcraft brownout is caused by the entrainment of dust |
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and sand particles in helicopter downwash, resulting in |
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reduced pilot visibility during low, slow flight and |
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landing. Recently, brownout has become a high-priority |
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problem for military operations because of the risk to |
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both pilot and equipment. Mitigation of this problem has |
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focused on flight controls and landing maneuvers, but |
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current knowledge and experimental data describing the |
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aerodynamic contribution to brownout are limited. This |
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paper focuses on downwash characteristics of a UH-60 |
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Blackhawk as they pertain to particle entrainment and |
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brownout. Results of a full-scale tuft test are presented |
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and used to validate a high-fidelity Navier-Stokes |
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computational fluid dynamics (CFD) calculation. CFD |
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analysis for an EH-101 Merlin helicopter is also |
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presented, and its flow field characteristics are |
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compared with those of the UH-60. |
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Date Published: 2018-07-24 00:35:12 |
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Identifier: DTIC_ADA509010 |
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Item Size: 40944297 |
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Language: english |
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Media Type: texts |
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# Topics |
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DTIC Archive; ; NATIONAL AERONAUTICS ... |
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@chris85 |
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