Armbruster, Wolfgang und Hardi, Justin und Oschwald, Michael (2018) High-Speed Flame Radiation Imaging of Thermoacoustic Coupling in a High Pressure Research Thrust Chamber. sonstiger Bericht. Sonderforschungsbereich Transregio 40.
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Kurzfassung
This work addresses the nature of supercritical hydrogen-oxygen flame coupling to acoustics through visualization under conditions representative of upper stage rocket engines. A research thrust chamber which shows self-excited combustion instabilities for certain operating conditions was used. Previous analysis proved that the instabilities are connected to injector acoustics. In this study a small optical access window was mounted in the chamber wall. High-speed flame radiation imaging of OH* and blue wavelengths has been applied in order to analyze the acoustic-flame interaction of one of the 42 flames. Dynamic mode decomposition results for a case with 80 bar chamber pressure showed that the flame dynamics are strongly influenced by the LOX injector acoustics, whereas for a 50 bar chamber pressure load point no flame response to injector acoustics was observed. A potential source of acoustic excitation for the oxygen injectors based on hydrodynamic effects is consistent with the contradictory behavior of the two load points.
elib-URL des Eintrags: | https://elib.dlr.de/133473/ | ||||||||
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Dokumentart: | Berichtsreihe (sonstiger Bericht) | ||||||||
Titel: | High-Speed Flame Radiation Imaging of Thermoacoustic Coupling in a High Pressure Research Thrust Chamber | ||||||||
Autoren: |
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Datum: | 2018 | ||||||||
Open Access: | Ja | ||||||||
Stichwörter: | combustion instability, thrust chamber, thermoacoustic coupling | ||||||||
Institution: | Sonderforschungsbereich Transregio 40 | ||||||||
DLR - Schwerpunkt: | Raumfahrt | ||||||||
DLR - Forschungsgebiet: | R RP - Raumtransport | ||||||||
Standort: | Lampoldshausen | ||||||||
Institute & Einrichtungen: | Institut für Raumfahrtantriebe > Raketenantriebe |
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