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Experimental and Numerical Analysis of Water Hammer During the Filling Process of Pipelines

Bombardieri, Cristiano und Traudt, Tobias und Manfletti, Chiara (2014) Experimental and Numerical Analysis of Water Hammer During the Filling Process of Pipelines. Space Propulsion 2014, 2014-05-19 - 2014-05-22, Cologne, Germany.

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Kurzfassung

During the start-up of the propulsion system of a spacecraft, the filling of an evacuated pipeline, a process known as priming, can generate severe pressure peaks due to the slam (water hammer) of the propellant against a closed thruster valve. The downstream conditions strongly affect the pressure surge; in the case of evacuated lines these pressure peaks can be as high as 250 bar and may lead to structure failure if not properly taken into account in the sub-system dimensioning. At DLR Lampoldshausen a new test-bench has been built in order to investigate priming process and other fluid transient phenomena. The experimental investigation presented in this paper includes priming test in both pre-pressurized and evacuated pipelines. Geometry of the test-section is a 2000 mm straight pipe with a relative large diameter (19mm) in order to examine high mass flow. From a physical point of view, the modeling of priming is a complex task, as it involves transient multiphase flow. As a first approach, an analytical model of the equations of motion is solved by applying the rigid liquid column theory, considering only the inertial and frictional effects of the liquid treated as a slug. The friction plays an important roles, in particular due to the unsteady conditions which increase its steady value. The cushion effect of an inert gas is also analyzed and the assumption of adiabatic vs isothermal compression compared. Results indicated that a polytropic compression can better model the realistic gas behavior. Finally, using a EcosimPro® numerical model of the test-bench (in conjunction with the ESPSS library, an ESAdeveloped tool capable of one dimensional, two-phase flow transient simulations), a comparison between numerical results against experimental data is presented and discussed.

elib-URL des Eintrags:https://elib.dlr.de/91619/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Experimental and Numerical Analysis of Water Hammer During the Filling Process of Pipelines
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Bombardieri, CristianoRA-RAK LANICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Traudt, TobiasRA-RAK LANICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Manfletti, ChiaraRA-RAK LANICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2014
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:water hammer, fluid transient, priming, EcosimPro ESPSS
Veranstaltungstitel:Space Propulsion 2014
Veranstaltungsort:Cologne, Germany
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:19 Mai 2014
Veranstaltungsende:22 Mai 2014
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Raumtransport
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R RP - Raumtransport
DLR - Teilgebiet (Projekt, Vorhaben):R - Antriebsystemtechnik - Schubkammertechnologie (alt)
Standort: Lampoldshausen
Institute & Einrichtungen:Institut für Raumfahrtantriebe > Raketenantriebe
Hinterlegt von: Hanke, Michaela
Hinterlegt am:10 Nov 2014 08:47
Letzte Änderung:24 Apr 2024 19:57

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