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Thermodynamic Interpretation of Cryogenic Injection Experiments

Banuti, Daniel and Hannemann, Klaus (2011) Thermodynamic Interpretation of Cryogenic Injection Experiments. 47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, 2011-07-21 - 2011-07-23, San Diego, USA.

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This paper discusses a thermodynamic rather than mechanic discussion and interpretation of cryogenic injection of nitrogen in the vicinity of the critical point. There is no concensus in the literature on how to properly interpret and treat injection phenomena at supercritical pressures. While it is clear that the supercritical fluid loses many distinct liquid properties, such as heat of vaporization and surface tension, flows are being treated like they were liquid. Liquid core lengths are being determined in experiments, distinct droplets are tracked in computational fluid dynamic studies. And in fact, these approaches prove to be very successful. Nevertheless, a more appropriate treatment is desireable, taking into account the specifics of supercritical fluids. A contribution is attempted in this paper. The concept of pseudo-boiling, a maximum in heat capacity associated with a strong increase in specific volume, is discussed. It will be shown that the ensemble of supercritical maximum heat capacity states is in fact an extension to the saturation curve. A novel interpretation of the Clapeyron equation of thermodynamics in the limit of the critical point and beyond will be given. It will be shown that this generalization is able to characterize the pseudo-boiling line. Furthermore it will be shown that the slope (d log p/dT) is constant for supercritical conditions and equals the value at the critical point. The pseudo-boiling approach is then applied to characterize injection experiments. It can be shown that the power needed to reach the pseudo-boiling state correlates with the structure of the axial density distribution.

Item URL in elib:https://elib.dlr.de/70725/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Thermodynamic Interpretation of Cryogenic Injection Experiments
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Series Name:Conference Proceedings on Disc
Keywords:cryogenic, injection, rocket, thermodynamics, supercritical
Event Title:47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit
Event Location:San Diego, USA
Event Type:international Conference
Event Start Date:21 July 2011
Event End Date:23 July 2011
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W RP - Raumtransport
DLR - Research area:Space
DLR - Program:W RP - Raumtransport
DLR - Research theme (Project):W - Leitprojekt - Propulsion 2010 / CFD und Simulation (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Spacecraft
Deposited By: Banuti, Daniel
Deposited On:16 Sep 2011 14:05
Last Modified:24 Apr 2024 19:36

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