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Sloshing Behaviour of Liquid Nitrogen in a Large Scale Cryogenic Tank Demonstrator

Darkow, Nicolas and Gerstmann, Jens and Konopka, Martin (2018) Sloshing Behaviour of Liquid Nitrogen in a Large Scale Cryogenic Tank Demonstrator. In: Proceedings of the International Astronautical Congress, IAC. 69th International Astronautical Congress (IAC), 2018-10-01 - 2018-10-05, Bremen, Deutschland. ISSN 0074-1795.

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The knowledge about the behaviour of the propellant in tank systems is of crucial importance for the design of spacecraft. The sloshing of liquid propellants is of direct importance for the flight stability since the sloshing forces may input the flight direction and altitude of the spacecraft. For the prediction of the sloshing behaviour in addition the sloshing frequency and the damping behaviour has to be known. In case of cryogenic liquids additional thermodynamic effects have to be considered which can have an effect on the tank pressure. To investigate the sloshing phenomena, as well as to generate an experimental data base for tool validation, sloshing tests with liquid nitrogen have been performed with the ArianeGroup Cryogenic Tank. The aim of this study is to determine the damping behaviour of liquid nitrogen in the ArianeGroup Cryogenic Tank for various fill levels and excitations. The tank demonstrator is mounted on a hexapod system and is equipped with a fill level sensor, an acceleration sensor and a force measurement system. During the tests, first the liquid is forced to a defined sinusoidal motion. After stop of excitation the sloshing forces and liquid motions are recorded and evaluated. The results show a strong influence of the damping behaviour on the sloshing angle. The damping varies during decaying movement and decreases with decreasing sloshing angle. The large tank radii, in conjunction with the low viscosity of the cryogenic liquid, lead to a significant increase in the Galilei number. In addition, turbulent effects are promoted in large tank systems due to the higher fluid velocities paired with low viscosity in case of sloshing. The influence of the sloshing angle on the damping behaviour is presented and discussed. The experimental results are compared with state of the art correlations from the literature.

Item URL in elib:https://elib.dlr.de/143499/
Document Type:Conference or Workshop Item (Speech)
Title:Sloshing Behaviour of Liquid Nitrogen in a Large Scale Cryogenic Tank Demonstrator
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:5 October 2018
Journal or Publication Title:Proceedings of the International Astronautical Congress, IAC
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Sloshing, Propellant Behaviour, Cryogenics
Event Title:69th International Astronautical Congress (IAC)
Event Location:Bremen, Deutschland
Event Type:international Conference
Event Start Date:1 October 2018
Event End Date:5 October 2018
Organizer:International Astronautical Federation (IAF)
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 - Lead Project - Upper Level Research Network
Location: Bremen
Institutes and Institutions:Institute of Space Systems > Transport and Propulsion System
Deposited By: Gerstmann, Dr.-Ing. Jens
Deposited On:09 Sep 2021 09:38
Last Modified:24 Apr 2024 20:43

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