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Free wake analysis of hover performance using a new influence coefficient methodA new approach to the prediction of helicopter rotor performance using a free wake analysis was developed. This new method uses a relaxation process that does not suffer from the convergence problems associated with previous time marching simulations. This wake relaxation procedure was coupled to a vortex-lattice, lifting surface loads analysis to produce a novel, self contained performance prediction code: EHPIC (Evaluation of Helicopter Performance using Influence Coefficients). The major technical features of the EHPIC code are described and a substantial amount of background information on the capabilities and proper operation of the code is supplied. Sample problems were undertaken to demonstrate the robustness and flexibility of the basic approach. Also, a performance correlation study was carried out to establish the breadth of applicability of the code, with very favorable results.
Document ID
19910009737
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Quackenbush, Todd R. (Continuum Dynamics, Inc. Princeton, NJ, United States)
Bliss, Donald B. (Continuum Dynamics, Inc. Princeton, NJ, United States)
Ong, Ching Cho (Continuum Dynamics, Inc. Princeton, NJ, United States)
Ching, Cho Ong (Continuum Dynamics, Inc. Princeton, NJ, United States)
Date Acquired
September 6, 2013
Publication Date
July 1, 1990
Publication Information
Publisher: NASA
Subject Category
Aerodynamics
Report/Patent Number
NASA-CR-4309
NAS 1.26:4309
A-90091
Accession Number
91N19050
Funding Number(s)
PROJECT: RTOP 505-61-51
CONTRACT_GRANT: SBIR-03.07-9282
CONTRACT_GRANT: NAS2-12148
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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