A numerical investigation of side-loads resulting from rigid body motions of an overexpanded engine nozzle

A numerical model for fluid–structure interactions is presented. Its purpose, within the context of 2D overexpanded engine nozzles, is to improve understanding of interactions between side‐loads and rigid body rotations, and more generally of the underlying physics between a shock in motion and nozz...

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Bibliographic Details
Published in:International journal for numerical methods in fluids 2011-06, Vol.66 (6), p.671-689
Main Author: LEFRANCOIS, E
Format: Article
Language:English
Subjects:
Engineering Sciences
Exact sciences and technology
finite elements
fluid-structure interaction
Fluids mechanics
Fundamental areas of phenomenology (including applications)
Mechanics
overexpanded rocket nozzle
Physics
rigid body motions
side-loads
Solid mechanics
Structural and continuum mechanics
Structural mechanics
Thermics
Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...)
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Summary:A numerical model for fluid–structure interactions is presented. Its purpose, within the context of 2D overexpanded engine nozzles, is to improve understanding of interactions between side‐loads and rigid body rotations, and more generally of the underlying physics between a shock in motion and nozzle movements. The model is based on three different solvers, for fluid, structure and mesh deformation respectively, which are linked to a coupling scheme in a parallel environment. In particular it is shown that the nozzle has a natural torsional frequency for which the measured side‐loads are the greatest. This phenomenon is associated with a transversal wave in the flow between the two internal walls of the nozzle. For free coupling cases, our calculations go some way to explain how the mechanical energy is dissipated with a transfer of energy to the shock that encounters the largest motions to dissipate it. It has also been observed that the compression shock may adopt a quasi‐steady state response with regard to nozzle rotations at low frequencies, whereas this will no longer be the case at higher frequencies, where a phase shift may occur between side‐loads and rotational position. This study is aimed at enhancing the only current aeroelastic stability model for overexpanded nozzles (AIAA, 29th Joint Propulsion Conference and Exhibit, Monterey, CA, 28–30 June 1993). Copyright © 2010 John Wiley & Sons, Ltd.
ISSN:0271-2091
1097-0363
DOI:10.1002/fld.2268