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RotCFD Analysis of the AH-56 Cheyenne Hub DragIn 2016, the U.S. Army Aviation Development Directorate (ADD) conducted tests in the U.S. Army 7- by 10- Foot Wind Tunnel at NASA Ames Research Center of a nonrotating 2/5th-scale AH-56 rotor hub. The objective of the tests was to determine how removing the mechanical control gyro affected the drag. Data for the lift, drag, and pitching moment were recorded for the 4-bladed rotor hub in various hardware configurations, azimuth angles, and angles of attack. Numerical simulations of a selection of the configurations and orientations were then performed, and the results were compared with the test data. To generate the simulation results, the hardware configurations were modeled using Creo and Rhinoceros 5, three-dimensional surface modeling computer-aided design (CAD) programs. The CAD model was imported into Rotorcraft Computational Fluid Dynamics (RotCFD), a computational fluid dynamics (CFD) tool used for analyzing rotor flow fields. RotCFD simulation results were compared with the experimental results of three hardware configurations at two azimuth angles, two angles of attack, and with and without wind tunnel walls. The results help validate RotCFD as a tool for analyzing low-drag rotor hub designs for advanced high-speed rotorcraft concepts. Future work will involve simulating additional hub geometries to reduce drag or tailor to other desired performance levels.
Document ID
20170000752
Acquisition Source
Ames Research Center
Document Type
Contractor Report (CR)
Authors
Solis, Eduardo (Monterey Technologies, Inc. Moffett Field, CA, United States)
Bass, Tal A. (Princeton Univ. NJ, United States)
Keith, Matthew D. (Alaska Univ. Fairbanks, AK, United States)
Oppenheim, Rebecca T. (Mississippi State Univ. Mississippi State, MS, United States)
Runyon, Bryan T. (Minnesota Univ. Duluth, MN, United States)
Veras-Alba, Belen (Science and Technology Corp. Moffett Field, CA, United States)
Date Acquired
January 24, 2017
Publication Date
October 1, 2016
Subject Category
Aeronautics (General)
Aircraft Design, Testing And Performance
Report/Patent Number
NASA/CR-2016-219395
ARC-E-DAA-TN35923
Funding Number(s)
CONTRACT_GRANT: NNX15AI18H
CONTRACT_GRANT: NNX15AH78H
CONTRACT_GRANT: NNX15AK05H
CONTRACT_GRANT: NNA16BD60C
CONTRACT_GRANT: NNA13AA84B
CONTRACT_GRANT: NNX15AI03H
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
AH-56 Cheyenne
RotCFD Analysis
Hub Drag

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