A numerical investigation of side-loads resulting from rigid body motions of an overexpanded engine nozzle - Université de technologie de Compiègne Access content directly
Journal Articles International Journal for Numerical Methods in Fluids Year : 2011

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

Abstract

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.

Dates and versions

hal-01993656 , version 1 (25-01-2019)

Identifiers

Cite

Emmanuel Lefrançois. A numerical investigation of side-loads resulting from rigid body motions of an overexpanded engine nozzle. International Journal for Numerical Methods in Fluids, 2011, 66 (6), pp.671-689. ⟨10.1002/fld.2268⟩. ⟨hal-01993656⟩
10 View
0 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More