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Large Eddy Simulation of Flashing Cryogenic Liquid with a Compressible Volume of Fluid Solver

Gärtner, Jan W. und Rees, Andreas und Kronenburg, Andreas und Sender, Joachim und Oschwald, Michael und Loureiro, Daniel (2019) Large Eddy Simulation of Flashing Cryogenic Liquid with a Compressible Volume of Fluid Solver. In: 29th European Conference Liquid Atomization and Spray Systems ILASS-Europe 2019. ILASS-Europe 2019, 29th Conference on Liquid Atomization and Sprays Systems, 2019-09-02 - 2019-09-04, Paris, France.

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Offizielle URL: https://ilass19.sciencesconf.org/browse/author?authorid=677422

Kurzfassung

For the development of new upper orbit thrusters with cryogenic propellants, it is important to understand the dynamics of oxidizer and fuel injection at near vacuum conditions before ignition. Due to the low ambient pressure with respect to the saturation pressure at the injection temperature, the propellants enter a superheated state and evaporate rapidly. This process is called flash evaporation. To simulate such a flashing cryogenic jet a compressible multiphase solver is developed in OpenFOAM. The homogeneous relaxation model (HRM) is chosen to model the phase change. For solving this multiphase problem, a one-fluid approach which solves for the mixture properties and phase fraction is selected. For the equation of state, the open source library CoolProp is used to calculate density, enthalpy and the saturation conditions. Further, the numerical methods to solve and capture the supersonic multiphase flow with a Volume of Fluid (VoF) method is described. The transition from mechanical break up to fully flashing spray and the change from subsonic to supersonic flow is investigated in detail. The numerical results are validated with experiments conducted at DLR Lampoldshausen which provide shadowgraph images. As a first approximation to fuel-oxidizer mixing, cryogenic nitrogen jet experiments at the DLR test bench M3.3 in Lampoldshausen are made and numerically investigated with large eddy simulations. It is noted that the flashing jet becomes supersonic and forms a shock shortly after the nozzle exit. This occurs despite the velocity being lower than the sonic velocities associated with each individual pure phase. The results show that the HRM model can predict the onset of the partial flashing flow, however fully flashing jet with 180 degree spray angle cannot be predicted with standard coefficients of the HRM model.

elib-URL des Eintrags:https://elib.dlr.de/132833/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Large Eddy Simulation of Flashing Cryogenic Liquid with a Compressible Volume of Fluid Solver
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Gärtner, Jan W.Universität Stuttgart, Institut für Technische Verbrennung, Stuttgart, DNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Rees, AndreasAndreas.Rees (at) dlr.dehttps://orcid.org/0000-0002-4114-636XNICHT SPEZIFIZIERT
Kronenburg, AndreasUniversität Stuttgart, Institut für Technische Verbrennung, Stuttgart, DNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Sender, JoachimJoachim.Sender (at) dlr.dehttps://orcid.org/0000-0002-7408-1208NICHT SPEZIFIZIERT
Oschwald, MichaelMichael.Oschwald (at) dlr.dehttps://orcid.org/0000-0002-9579-9825NICHT SPEZIFIZIERT
Loureiro, DanielUniversität Stuttgart, Institut für Technische Verbrennung, Stuttgart, DNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2019
Erschienen in:29th European Conference Liquid Atomization and Spray Systems ILASS-Europe 2019
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:flash-boiling, homogeneous relaxation model (HRM), compressible multiphase solver, flashing cryogenic nitrogen
Veranstaltungstitel:ILASS-Europe 2019, 29th Conference on Liquid Atomization and Sprays Systems
Veranstaltungsort:Paris, France
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:2 September 2019
Veranstaltungsende:4 September 2019
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Raumtransport
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R RP - Raumtransport
DLR - Teilgebiet (Projekt, Vorhaben):R - Leitprojekt - Forschungsverbund Oberstufe (alt)
Standort: Lampoldshausen
Institute & Einrichtungen:Institut für Raumfahrtantriebe > Raketenantriebe
Hinterlegt von: Hanke, Michaela
Hinterlegt am:16 Dez 2019 17:15
Letzte Änderung:24 Apr 2024 20:36

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