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Characterisation of Acoustic Energy Content in an Experimental Combustion Chamber with and without External Forcing

Webster, S. and Hardi, Justin and Oschwald, Michael (2013) Characterisation of Acoustic Energy Content in an Experimental Combustion Chamber with and without External Forcing. In: Proceedings 5th EUCASS. 5th European Conference for Aeronautics and Space Sciences EUCASS 2013, 1. - 5. Jul. 2013, München, Germany. ISBN 978-84-941531-0-5

Full text not available from this repository.

Abstract

The influence of injection conditions on rocket engine combustion stability is investigated for a sub-scale combustion chamber with shear coaxial injection elements and the propellant combination hydrogen-oxygen. The experimental results presented are from a series of tests conducted at sub and super critical pressures for oxygen and for both ambient and cryogenic hydrogen. The stability of the system is characterised by the root mean squared amplitude of dynamic combustion chamber pressure for both the non-forced and externally forced combustion chamber configurations. It was found for both the externally forced and non-forced configurations the injection velocity had the strongest influence on combustion chamber stability. Through the use of multivariate linear regression the influence of hydrogen injection temperature and hydrogen injection mass flow rate were best able to explain the variance observed in the injection velocity ratio relationship. For the externally forced configuration a nonlinear regression model was better able to predict the variance, suggesting the influence of nonlinear behaviour. The response of the system to variation of injection conditions was found to be small, suggesting that the combustion chamber investigated in the experiment is naturally highly stable.

Item URL in elib:https://elib.dlr.de/85478/
Document Type:Conference or Workshop Item (Speech)
Title:Characterisation of Acoustic Energy Content in an Experimental Combustion Chamber with and without External Forcing
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Webster, S.Samuel.Webster (at) dlr.deUNSPECIFIED
Hardi, JustinJustin.Hardi (at) dlr.dehttps://orcid.org/0000-0003-3258-5261
Oschwald, MichaelMichael.Oschwald (at) dlr.dehttps://orcid.org/0000-0002-9579-9825
Date:2013
Journal or Publication Title:Proceedings 5th EUCASS
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
ISBN:978-84-941531-0-5
Status:Published
Keywords:injection, rocket engine, sub-scale
Event Title:5th European Conference for Aeronautics and Space Sciences EUCASS 2013
Event Location:München, Germany
Event Type:international Conference
Event Dates:1. - 5. Jul. 2013
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:21 Nov 2013 14:40
Last Modified:01 Dec 2018 19:49

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