Investigation of adding fins to external stores for improving the flutter characteristics of a wing/store configuration

M. R. Amoozgar, H. Shahverdi

Research output: Contribution to journalArticle

Abstract

In this paper, the effect of aerodynamic damping produced by store rear horizontal fins on the aeroelastic instability of a wing with a large underwing store is investigated in an incompressible flow. The wing is modeled by using the classical Euler-Bernoulli beam theory while the unsteady strip aerodynamic theory based on the Wagner function is used to simulate the aerodynamic field. The underwing store is modeled as a concentrated mass attached to the wing by a rigid pylon and has rear horizontal fins. The numerical results of the developed generic and simple model are compared with available results, and an excellent agreement is observed. It is found that the aerodynamic damping of the store produced by its rear fin can compensate the flutter boundary of the wing-store configuration and therefore for more accurate analysis, in addition to the store weight and location, the effect of store fin must also be considered.

Original languageEnglish
Pages (from-to)1507-1517
Number of pages11
JournalProceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering
Volume230
Issue number8
DOIs
Publication statusPublished - 1 Jun 2016
Externally publishedYes

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Flutter (aerodynamics)
Aerodynamics
Damping
Incompressible flow

Cite this

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title = "Investigation of adding fins to external stores for improving the flutter characteristics of a wing/store configuration",
abstract = "In this paper, the effect of aerodynamic damping produced by store rear horizontal fins on the aeroelastic instability of a wing with a large underwing store is investigated in an incompressible flow. The wing is modeled by using the classical Euler-Bernoulli beam theory while the unsteady strip aerodynamic theory based on the Wagner function is used to simulate the aerodynamic field. The underwing store is modeled as a concentrated mass attached to the wing by a rigid pylon and has rear horizontal fins. The numerical results of the developed generic and simple model are compared with available results, and an excellent agreement is observed. It is found that the aerodynamic damping of the store produced by its rear fin can compensate the flutter boundary of the wing-store configuration and therefore for more accurate analysis, in addition to the store weight and location, the effect of store fin must also be considered.",
keywords = "aerodynamic damping, Aeroelastic instability, flutter boundary, store horizontal fin, unsteady aerodynamic",
author = "Amoozgar, {M. R.} and H. Shahverdi",
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T1 - Investigation of adding fins to external stores for improving the flutter characteristics of a wing/store configuration

AU - Amoozgar, M. R.

AU - Shahverdi, H.

PY - 2016/6/1

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N2 - In this paper, the effect of aerodynamic damping produced by store rear horizontal fins on the aeroelastic instability of a wing with a large underwing store is investigated in an incompressible flow. The wing is modeled by using the classical Euler-Bernoulli beam theory while the unsteady strip aerodynamic theory based on the Wagner function is used to simulate the aerodynamic field. The underwing store is modeled as a concentrated mass attached to the wing by a rigid pylon and has rear horizontal fins. The numerical results of the developed generic and simple model are compared with available results, and an excellent agreement is observed. It is found that the aerodynamic damping of the store produced by its rear fin can compensate the flutter boundary of the wing-store configuration and therefore for more accurate analysis, in addition to the store weight and location, the effect of store fin must also be considered.

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KW - aerodynamic damping

KW - Aeroelastic instability

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KW - unsteady aerodynamic

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