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Mechanisms Contributing to the Dynamic Stability of a Flexible Subscale Rocket Nozzle

Jack, Sebastian and Oschwald, Michael and Eggers, Thino (2023) Mechanisms Contributing to the Dynamic Stability of a Flexible Subscale Rocket Nozzle. Journal of Propulsion and Power, pp. 1-11. American Institute of Aeronautics and Astronautics (AIAA). doi: 10.2514/1.B39178. ISSN 0748-4658. (In Press)

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Official URL: https://dx.doi.org/10.2514/1.B39178


Forced motion simulations of an overexpanded subscale rocket nozzle were performed to investigate the transient mechanisms that lead to self-exciting fluid–structure interaction as observed in preceded studies. The pressure response to the deformation could be separated into two regions upstream and downstream the flow separation position. Within these regions the transient part of the pressure was analyzed using fast Fourier transform based on the method of generalized aerodynamic forces. The amplitude spectrum and phase shift distribution of the pressure response could be explained by superposition of three independently acting mechanisms: the inclination effect, the existence of a moving axial pressure wave, and intrinsic oscillations caused by the turbulence created by the strong shock system. Simplified simulation setups using a bent flat plate and a detailed unsteady simulation of the flow in the undeformed nozzle were analyzed to validate these assumptions.

Item URL in elib:https://elib.dlr.de/199017/
Document Type:Article
Title:Mechanisms Contributing to the Dynamic Stability of a Flexible Subscale Rocket Nozzle
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Jack, SebastianUNSPECIFIEDhttps://orcid.org/0000-0002-1554-6503UNSPECIFIED
Oschwald, MichaelUNSPECIFIEDhttps://orcid.org/0000-0002-9579-9825UNSPECIFIED
Date:5 September 2023
Journal or Publication Title:Journal of Propulsion and Power
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-11
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
Status:In Press
Keywords:Rocket Engine Nozzle, Fluid-Structure Interaction, Computational Fluid Dynamics, TAU, Unsteady Reynolds Averaged Navier Stokes
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transportation
DLR - Research area:Raumfahrt
DLR - Program:R RP - Space Transportation
DLR - Research theme (Project):R - Project TAUROS (TAU for Rocket Thrust Chamber Simulation), R - Project Amadeus
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Spacecraft, BS
Institute of Space Propulsion > Rocket Propulsion Technology
Deposited By: Jack, Sebastian
Deposited On:30 Nov 2023 15:10
Last Modified:30 Nov 2023 15:10

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