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Supercritical Pseudo-Boiling and its Relevance for Transcritical Injection

Banuti, Daniel und Hannemann, Klaus (2014) Supercritical Pseudo-Boiling and its Relevance for Transcritical Injection. American Institute of Aeronautics and Astronautics. 50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, 2014-07-28 - 2014-07-30, Cleveland, Ohio, USA. doi: 10.2514/6.2014-3571.

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Offizielle URL: http://arc.aiaa.org/doi/pdf/10.2514/6.2014-3571

Kurzfassung

In this paper, a new interpretation of cryogenic jet break-up in supercritical environments is introduced. It is firmly established that under these conditions a pure fluid will exhibit neither latent heat of vaporization nor surface tension. The jet undergoes a transition from a dense cryogenic fluid to an ideal gas as it mixes and blends with the surrounding warmer gas. Regarding the thermodynamic process, this transition is characterized by large changes in density and very small changes in temperature as energy is supplied. The state where density changes and the heat capacity are maximal is sometimes called `pseudo-boiling' in the literature. However, no clear definition of this process is available, its very existence debated. In this paper, the first quantitative pseudo-boiling analysis is presented. It can be shown that pseudo-boiling exists along a line which effectively structures supercritical uid states. An equation for this continuation of the coexistence line is given. Across this line, a continuous state transition can be identfied. The temperature at pseudo-boiling replaces the critical temperature as relevant parameter at supercritical pressures. By introducing a suitable definition for a supercritical uid boundary, supercritical jet break-up can be quantified thermodynamically. This suggests a novel, thermal, jet break-up mechanism. Experimental evidence from the literature is shown, further supported by CFD simulations. The pseudo-boiling effect is found to play a role for injection conditions of reduced pressures smaller than 3, and reduced temperatures lower than 1.2.

elib-URL des Eintrags:https://elib.dlr.de/89453/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Supercritical Pseudo-Boiling and its Relevance for Transcritical Injection
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Banuti, Danieldaniel.banuti (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Hannemann, Klausklaus.hannemann (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2014
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
DOI:10.2514/6.2014-3571
Seitenbereich:Seiten 1-16
Verlag:American Institute of Aeronautics and Astronautics
Name der Reihe:Conference Proceedings online
Status:veröffentlicht
Stichwörter:pseudoboiling, transcritical, real gas, supercritical, injection
Veranstaltungstitel:50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference
Veranstaltungsort:Cleveland, Ohio, USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:28 Juli 2014
Veranstaltungsende:30 Juli 2014
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 - ProTAU + Prop2020 Hochleistungstriebwerke (alt)
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Raumfahrzeuge
Hinterlegt von: Micknaus, Ilka
Hinterlegt am:18 Aug 2014 08:59
Letzte Änderung:24 Apr 2024 19:55

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