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Experimental study of water hammer pressure surge

Bombardieri, Cristiano and Traudt, Tobias and Manfletti, Chiara (2019) Experimental study of water hammer pressure surge. In: Progress in Propulsion Physics Torus Press. pp. 555-570. ISBN 978-5-94588-228-7. ISSN 2493-3503

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Official URL: https://www.eucass-proceedings.eu/articles/eucass/abs/2019/01/eucass2019_555/eucass2019_555.html

Abstract

During the start-up of the propulsion system of a satellite or spacecraft, the opening of the tank isolation valve will cause the propellant to flow into an evacuated feedline and slam against a closed thruster valve. This filling process, called priming, can cause severe pressure peaks that could lead to structural failure. In the case of monopropellants such as hydrazine, also, the risk of adiabatic compression detonation must be taken into account in the design of the feedline subsystem. The phenomenon of priming involves complex two-phase flow: the liquid entering the evacuated pipe undergoes flash evaporation creating a vapor cushion in front of the liquid that mixes with the residual inert gas in the line. Moreover, the dissolved pressurizing gas in the liquid will desorb making the priming process difficult to model. In order to study this phenomenon, a new test-bench has been built at DLR Lampoldshausen which allows fluid transient experiments in the same conditions as the operating space system. Tests are performed with water and ethanol at different conditions (tank pressure, vacuum level, pressurizing gas helium vs. nitrogen, etc.). The effect of the geometry is also investigated, comparing different test-elements such as straight, tees, and elbow pipes. The pressure profile is found to be dependent on the geometry and on the downstream conditions. The acoustic wave reflection caused by the pipe geometry and fluid dynamic effects such as the aforementioned desorption and flash evaporation induce a complex pressure profile of the first pressure peak. Finally, numerical simulations of the priming process are performed by means of EcosimPro software in conjunction with European Space Propulsion System Simulation (ESPSS) libraries and results are compared with experiments.

Item URL in elib:https://elib.dlr.de/132757/
Document Type:Book Section
Title:Experimental study of water hammer pressure surge
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bombardieri, CristianoGerman Aerospace Center DLR, Lampoldshausen, DUNSPECIFIED
Traudt, TobiasTobias.Traudt (at) dlr.dehttps://orcid.org/0000-0002-0206-0483
Manfletti, ChiaraGerman Aerospace Center DLR, Lampoldshausen, DUNSPECIFIED
Date:8 February 2019
Journal or Publication Title:Progress in Propulsion Physics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:11
DOI :10.1051/eucass/201911565
Page Range:pp. 555-570
Publisher:Torus Press
ISSN:2493-3503
ISBN:978-5-94588-228-7
Status:Published
Keywords:propulsion
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 - Antriebsystemtechnik - Schubkammertechnologie
Location: Lampoldshausen
Institutes and Institutions:Institute of Space Propulsion > Rocket Propulsion
Deposited By: Hanke, Michaela
Deposited On:13 Dec 2019 13:22
Last Modified:13 Dec 2019 13:22

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