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A CFD study of tilt rotor flowfieldsThe download on the wing produced by the rotor wake of a tilt rotor vehicle in hover is of major concern because of its severe impact on payload-carrying capability. In a concerted effort to understand the fundamental fluid dynamics that cause this download, and to help find ways to reduce it, computational fluid dynamics (CFD) is employed to study this problem. The thin-layer Navier-Stokes equations are used to describe the flow, and an implicit, finite difference numerical algorithm is the method of solution. The methodology is developed to analyze the tilt rotor flowfield. Included are discussions of computations of an airfoil and wing in freestream flows at -90 degrees, a rotor alone, and wing/rotor interaction in two and three dimensions. Preliminary results demonstrate the feasibility and great potential of the present approach. Recommendations are made for both near-term and far-term improvements to the method.
Document ID
19900004033
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Fejtek, Ian (Stanford Univ. CA, United States)
Roberts, Leonard (Stanford Univ. CA, United States)
Date Acquired
September 6, 2013
Publication Date
October 1, 1989
Subject Category
Aerodynamics
Report/Patent Number
JIAA-TR-96
NAS 1.26:186116
NASA-CR-186116
Accession Number
90N13349
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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