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Selection Rules for Resonant Longitudinal Injector-Coupling in Experimental Rocket Combustors

Horchler, Tim (2022) Selection Rules for Resonant Longitudinal Injector-Coupling in Experimental Rocket Combustors. Aerospace, 9 (11), pp. 1-18. Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/aerospace9110669. ISSN 2226-4310.

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Official URL: https://www.mdpi.com/1914576


This paper investigates different types of longitudinal mode coupling in subscale rocket combustion chambers using experimental data and numerical simulations. Based on a one-dimensional planar wave acoustic model of coupled cavity resonators with two acoustic inlet boundary conditions, mode selection rules are derived, providing a simple way of predicting which injector and combustion chamber modes have matching frequencies. Longitudinal mode coupling of an injector with an acoustically open inlet boundary condition has been reported in the literature for the start-up transient of a research combustor experiment. In this experiment, every third injector mode couples to a corresponding chamber longitudinal mode, which is explained in terms of the selection rules derived in this paper. Numerical simulation results for a different combustor experiment show an unexpected mode coupling behavior when an acoustically closed injector inlet is used. Theoretical analysis by using the one-dimensional wave model and applying the derived selection rules shows that in this setup, the injector acoustic mode can accommodate two different acoustic boundary conditions at the injector-chamber interface simultaneously. This results in different acoustic mode shapes in the injector, explaining the unexpected behavior for the resonant coupling with an acoustically closed injector inlet.

Item URL in elib:https://elib.dlr.de/188176/
Document Type:Article
Title:Selection Rules for Resonant Longitudinal Injector-Coupling in Experimental Rocket Combustors
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Horchler, TimUNSPECIFIEDhttps://orcid.org/0000-0002-8439-8786UNSPECIFIED
Date:29 October 2022
Journal or Publication Title:Aerospace
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 1-18
EditorsEmailEditor's ORCID iDORCID Put Code
Hardi, JustinUNSPECIFIEDhttps://orcid.org/0000-0003-3258-5261UNSPECIFIED
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
Series Name:Special Issue Liquid Rocket Engines
Keywords:Verbrennungsinstabilitäten, Injektorkopplung, akustische Moden, numerische Simulation, Brennkammerexperimente
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 Amadeus
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Spacecraft, GO
Deposited By: Horchler, Tim
Deposited On:23 Nov 2022 14:41
Last Modified:23 Nov 2022 14:41

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