DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Injector‑coupled thermoacoustic instabilities in an experimental LOX‑methane rocket combustor during start‑up

Klein, Sebastian and Börner, Michael and Hardi, Justin and Suslov, Dmitry and Oschwald, Michael (2020) Injector‑coupled thermoacoustic instabilities in an experimental LOX‑methane rocket combustor during start‑up. CEAS Space Journal, 12, pp. 267-279. Springer. doi: 10.1007/s12567-019-00294-4. ISSN 1868-2502.

[img] PDF - Published version

Official URL: https://link.springer.com/article/10.1007/s12567-019-00294-4#rightslink


This paper reports the investigation of acoustic combustion instability experienced during repetitive ignition testing of a sub-scale LOX-methane rocket thrust chamber. The occurrence of resonant coupling between the LOX injectors and the combustion chamber acoustic modes was assessed from the experimental data recorded during the highly transient phase of operation from ignition up to around 2 s. A method was developed to model the evolution of acoustic properties in both the combustion chamber and the injectors during the transient period. For the LOX injectors, the Woods equation was used to estimate the speed of sound in the two-phase flow. The models were used to identify the corresponding mode frequencies in the unsteady pressure measurements, and show that the high-amplitude instability occurred when they intersected. Very close coupling of less than 3% frequency difference is required for high amplitudes to be observed. However, the condition was necessary but not sufficient for high amplitudes to be reached.

Item URL in elib:https://elib.dlr.de/138072/
Document Type:Article
Title:Injector‑coupled thermoacoustic instabilities in an experimental LOX‑methane rocket combustor during start‑up
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Klein, SebastianUNSPECIFIEDhttps://orcid.org/0000-0002-0579-655XUNSPECIFIED
Börner, MichaelUNSPECIFIEDhttps://orcid.org/0000-0002-3441-2869UNSPECIFIED
Hardi, JustinUNSPECIFIEDhttps://orcid.org/0000-0003-3258-5261UNSPECIFIED
Suslov, DmitryUNSPECIFIEDhttps://orcid.org/0000-0002-5160-9292UNSPECIFIED
Oschwald, MichaelUNSPECIFIEDhttps://orcid.org/0000-0002-9579-9825UNSPECIFIED
Journal or Publication Title:CEAS Space Journal
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 267-279
Keywords:high-frequency instability, combustion stability, LOX/CH4, methane
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 - Reusable Space Systems and Propulsion Technology
Location: Lampoldshausen
Institutes and Institutions:Institute of Space Propulsion > Rocket Propulsion
Deposited By: Hanke, Michaela
Deposited On:30 Nov 2020 08:15
Last Modified:23 Oct 2023 12:51

Repository Staff Only: item control page

Help & Contact
electronic library is running on EPrints 3.3.12
Website and database design: Copyright © German Aerospace Center (DLR). All rights reserved.