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Hi-alpha forebody design. Part 2: Determination of body shapes for positive directional stabilityComputational Fluid Dynamics (CFD) has been used to study aircraft forebody flowfields at low speed high angle-of-attack conditions with sideslip. The purpose is to define forebody geometries which provide good directional stability characteristics under these conditions. The flows of the F-5A forebody and Erickson forebody were recomputed with better and refined grids. The results were obtained using a modified version of cfl3d to solve either the Euler equations or the Reynolds equations employing a form of the Baldwin-Lomax turbulence model. Based on those results, we conclude that current CFD methods can be used to investigate the aerodynamic characteristics of forebodies to achieve desirable high angle-of-attack characteristics. An analytically defined generic forebody model is described, and a systematic study of forebody shapes was then conducted to determine which shapes promote a positive contribution to directional stability at high angle-of-attack. A novel way of presenting the results is used to illustrate how the positive contribution arises. Based on the results of this initial parametric study, some guidelines for aerodynamic design to promote positive directional stability are presented.
Document ID
19920008796
Acquisition Source
Legacy CDMS
Document Type
Other - Other
Authors
Ravi, R. (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Mason, William H. (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Date Acquired
September 6, 2013
Publication Date
February 2, 1991
Subject Category
Aircraft Design, Testing And Performance
Report/Patent Number
NASA-CR-189850
NAS 1.26:189850
VPI-AERO-182-REV
Accession Number
92N18038
Funding Number(s)
CONTRACT_GRANT: NAG1-1037
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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