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Forebody Articulation at High Angles of Incidence.

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Title: Forebody Articulation at High Angles of Incidence.
Authors: Kumar, Roopesh1, Foster, Devon S.1, Kumar, Rajan1, Dickinson, Benjamin T.2
Source: AIAA Journal. Oct2023, Vol. 61 Issue 10, p4401-4418. 18p.
Abstract: An experimental investigation was carried out to understand the effect of forebody articulation on the aerodynamic characteristics and the flowfield development over a slender body at high angles of incidence. The experiments were carried out at the Florida A&M University and Florida State University low-speed wind tunnel over a range of forebody deflection (δ=0, ±10, and ±20 deg) and flow conditions. The results show that a positive forebody deflection increases the normal-force coefficient, whereas a negative forebody deflection decreases the normal-force coefficient at high angles of incidence. Pitching moment characteristics showed that all forebody deflections tested produce a pitching moment despite minimal normal force at low angles of incidence. Lateral aerodynamic characteristics showed that the side-force onset angle does not solely depend on the semi-apex angle of the forebody (as predicted for axisymmetric slender bodies), and the role of the forebody-to-aftbody transition geometry in initiating vortex asymmetry is equally important. The particle image velocimetry results show that a positive forebody deflection increases the size, strength, and circulation of the vortices developing on the body, leading to an increase in aerodynamic forces and moments. The flowfield development for a negative forebody deflection is dominated by secondary shear-layer vortices originating from the forebody to aftbody junction. [ABSTRACT FROM AUTHOR]
Copyright of AIAA Journal is the property of American Institute of Aeronautics & Astronautics and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 172830831
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Forebody Articulation at High Angles of Incidence.
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  Data: <searchLink fieldCode="AR" term="%22Kumar%2C+Roopesh%22">Kumar, Roopesh</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Foster%2C+Devon+S%2E%22">Foster, Devon S.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kumar%2C+Rajan%22">Kumar, Rajan</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Dickinson%2C+Benjamin+T%2E%22">Dickinson, Benjamin T.</searchLink><relatesTo>2</relatesTo>
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  Data: An experimental investigation was carried out to understand the effect of forebody articulation on the aerodynamic characteristics and the flowfield development over a slender body at high angles of incidence. The experiments were carried out at the Florida A&M University and Florida State University low-speed wind tunnel over a range of forebody deflection (δ=0, ±10, and ±20 deg) and flow conditions. The results show that a positive forebody deflection increases the normal-force coefficient, whereas a negative forebody deflection decreases the normal-force coefficient at high angles of incidence. Pitching moment characteristics showed that all forebody deflections tested produce a pitching moment despite minimal normal force at low angles of incidence. Lateral aerodynamic characteristics showed that the side-force onset angle does not solely depend on the semi-apex angle of the forebody (as predicted for axisymmetric slender bodies), and the role of the forebody-to-aftbody transition geometry in initiating vortex asymmetry is equally important. The particle image velocimetry results show that a positive forebody deflection increases the size, strength, and circulation of the vortices developing on the body, leading to an increase in aerodynamic forces and moments. The flowfield development for a negative forebody deflection is dominated by secondary shear-layer vortices originating from the forebody to aftbody junction. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Group: Ab
  Data: <i>Copyright of AIAA Journal is the property of American Institute of Aeronautics & Astronautics and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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        Value: 10.2514/1.J062637
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      – Code: eng
        Text: English
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      – TitleFull: Forebody Articulation at High Angles of Incidence.
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            NameFull: Kumar, Roopesh
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            NameFull: Foster, Devon S.
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            NameFull: Kumar, Rajan
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            NameFull: Dickinson, Benjamin T.
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              Text: Oct2023
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              Y: 2023
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