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Analysis of Acoustic Energy Dissipation in a Rectangular Combustion Chamber with Injection of Cryogenic Propellants

Webster, S. and Hardi, J. and Oschwald, M. (2014) Analysis of Acoustic Energy Dissipation in a Rectangular Combustion Chamber with Injection of Cryogenic Propellants. Space Propulsion 2014, 19. - 22. Mai 2014, Cologne, Germany.

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Abstract

The acoustic energy dissipation in a hydrogen-oxygen combustion chamber at sub-and supercritical conditions for oxygen was investigated. The investigation was undertaken using the sub-scale combustion chamber designated ‘BKH’. The first two eigenmodes of BKH, the first longitudinal, and first tangential, were investigated. Two independent methods were applied to measure acoustic dissipation in the combustion chamber. First, a time domain measurement of the acoustic dissipation rate was made by periodically forcing combustion chamber acoustics. Secondly, the frequency response of the system to a constant amplitude forcing was used. The acoustic dissipation measurements from both methods were found to compare well. It was found that the frequency response was not always symmetric, so applicability of the asymmetric Lorentzian and Fano profiles were also investigated. It was found that the asymmetric profiles were able to accurately capture the dissipation behaviour of the damped signal. The acoustic dissipation was found to be larger for the first longitudinal mode than for the first tangential mode, in particular for operating conditions without combustion. With combustion the longitudinal dissipation remained around 700 (1/s) whereas an increase from 300 (1/s) to around 500 (1/s) was observed for the first tangential mode.

Item URL in elib:https://elib.dlr.de/91650/
Document Type:Conference or Workshop Item (Speech)
Title:Analysis of Acoustic Energy Dissipation in a Rectangular Combustion Chamber with Injection of Cryogenic Propellants
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Webster, S.RA-RAK LAUNSPECIFIED
Hardi, J.RA-RAK LAUNSPECIFIED
Oschwald, M.RA-RAK LAUNSPECIFIED
Date:2014
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:rocket combustion; rocket engine; combustion chamber
Event Title:Space Propulsion 2014
Event Location:Cologne, Germany
Event Type:international Conference
Event Dates:19. - 22. Mai 2014
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):R - Antriebsystemtechnik - Schubkammertechnologie
Location: Lampoldshausen
Institutes and Institutions:Institute of Space Propulsion > Rocket Propulsion
Deposited By: Hanke, Michaela
Deposited On:10 Nov 2014 08:48
Last Modified:10 Nov 2014 08:48

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