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Supercritical Pseudo-Boiling and its Relevance for Transcritical Injection

Banuti, Daniel and 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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Official URL: http://arc.aiaa.org/doi/pdf/10.2514/6.2014-3571


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.

Item URL in elib:https://elib.dlr.de/89453/
Document Type:Conference or Workshop Item (Speech)
Title:Supercritical Pseudo-Boiling and its Relevance for Transcritical Injection
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 1-16
Publisher:American Institute of Aeronautics and Astronautics
Series Name:Conference Proceedings online
Keywords:pseudoboiling, transcritical, real gas, supercritical, injection
Event Title:50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference
Event Location:Cleveland, Ohio, USA
Event Type:international Conference
Event Start Date:28 July 2014
Event End Date:30 July 2014
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transportation
DLR - Research area:Raumfahrt
DLR - Program:R RP - Space Transportation
DLR - Research theme (Project):R - ProTAU + Prop2020 Hochleistungstriebwerke (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Spacecraft
Deposited By: Micknaus, Ilka
Deposited On:18 Aug 2014 08:59
Last Modified:24 Apr 2024 19:55

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