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The absence of a dense potential core in supercritical Injection: A thermal break-up mechanism

Banuti, Daniel and Hannemann, Klaus (2016) The absence of a dense potential core in supercritical Injection: A thermal break-up mechanism. Physics of Fluids, 28 (035103). American Institute of Physics (AIP). DOI: 10.1063/1.4943038 ISSN 1070-6631

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Official URL: http://aip.scitation.org/doi/full/10.1063/1.4943038

Abstract

Certain experiments in quasi-isobaric supercritical injection remain unexplained by the current state of theory: Without developing a constant value potential core as expected from the mechanical view of break-up, density is observed to drop immediately upon entering the chamber. Furthermore, this phenomenon has never been captured in computational fluid dynamics (CFD) despite having become a de facto standard case for real fluid CFD validation. In this paper, we present strong evidence for a thermal jet disintegration mechanism (in addition to classical mechanical break-up) which resolves both the theoretical and the computational discrepancies. A new interpretation of supercritical jet disintegration is introduced, based on pseudo-boiling, a nonlinear supercritical transition from gas-like to liquid-like states. We show that thermal disintegration may dominate classical mechanical break-up when heat transfer takes place in the injector and when the fluid state is sufficiently close to the pseudo-boiling point. A procedure which allows to capture subsided cores with standard CFD is provided and demonstrated.

Item URL in elib:https://elib.dlr.de/104045/
Document Type:Article
Additional Information:AIP Publishing
Title:The absence of a dense potential core in supercritical Injection: A thermal break-up mechanism
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Banuti, Danield.banuti (at) stanford.eduUNSPECIFIED
Hannemann, Klausklaus.hannemann (at) dlr.deUNSPECIFIED
Date:2016
Journal or Publication Title:Physics of Fluids
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:28
DOI :10.1063/1.4943038
Publisher:American Institute of Physics (AIP)
ISSN:1070-6631
Status:Published
Keywords:supercritical injection, cryogenic, dense core
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):R - Raumfahrzeugsysteme - Anlagen u. Messtechnik
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Spacecraft
Deposited By: Bachmann, Barbara
Deposited On:18 Jul 2016 10:09
Last Modified:08 Mar 2018 18:48

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