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Modelling of Cryopumps for Space Electric Propulsion Usage

Neumann, Andreas and Brchnelova, Michaela (2021) Modelling of Cryopumps for Space Electric Propulsion Usage. In: 8th Russian-German Conference on Electric Propulsion. 8th Russian-German Conference on Electric Propulsion, 11.-16. April 2021, Kaliningrad - online.

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Official URL: http://rgcep.fakel-russia.com/index.php/en/


Telecommunication satellites and also planetary exploration spacecraft use more and more electric propulsion systems for maneuvering in space. The main advantage of these propulsion systems is their low fuel consumption and with that higher v capabilities. Space systems and propulsion units have to fulfill extensive on-ground testing. As EP systems usually have low thrust and longer run times compared to chemical propulsion ground testing times are further extended. EP qualification has to be performed in dedicated vacuum chambers. The German Aerospace Center DLR operates the electric propulsion vacuum test facility STG-ET in Goettingen. EP testing requires powerful pumping systems for keeping pressure low enough. At STG-ET cryogenic pumps are used for these tasks, which use cryogenic pumps that freeze gases on cold surfaces inside the vacuum chamber. The detailed processes on cold pumping surfaces are very complex and depend on optical and mechanical properties of ice layers composed of several species. Furthermore, sputtering caused by exhaust plume ions modifies surface and deposits on a cold pump plate. This paper presents some basics and numerical modeling of the cryogenic processes during cooldown, operation, and recycling of the pumps. This may help for optimizing the usage of cryopumps for EP facility operation.

Item URL in elib:https://elib.dlr.de/142820/
Document Type:Conference or Workshop Item (Speech)
Title:Modelling of Cryopumps for Space Electric Propulsion Usage
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Neumann, AndreasDLR Göttingenhttps://orcid.org/0000-0002-6049-8969UNSPECIFIED
Date:13 April 2021
Journal or Publication Title:8th Russian-German Conference on Electric Propulsion
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
EditorsEmailEditor's ORCID iDORCID Put Code
Keywords:vacuum chamber, electric propulsion, cryopumps
Event Title:8th Russian-German Conference on Electric Propulsion
Event Location:Kaliningrad - online
Event Type:international Conference
Event Dates:11.-16. April 2021
Organizer:Fakel, RUS
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 - Reusable Space Systems and Propulsion Technology
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Spacecraft, GO
Deposited By: Neumann, Andreas
Deposited On:23 Jun 2021 15:09
Last Modified:23 Jun 2021 15:19

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