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Europa Lander Plume-Induced Contamination: DSMC Modeling of Monopropellant Plume Testing

Conte, Antonietta and Hoey, W. A. and Wong, A. and Soares, Carlos E. and Grabe, Martin and Hepp, Christian (2021) Europa Lander Plume-Induced Contamination: DSMC Modeling of Monopropellant Plume Testing. re-RGD32 Online Workshop on Recent Hot Topics in Rarefied Gas Dynamics, 07.-10. Jul. 2021, online.

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Abstract

Powered spacecraft landings onto airless bodies – like Jupiter’s icy moon Europa, or Saturn’s icy moon Enceladus – can expose scientific sampling sites to contamination via the byproducts of chemical propulsion systems. It is critical to advance and validate predictive analysis capabilities for thruster plume-induced contamination in such landings to mature the technologies required for the success of the Europa Lander mission concept and other future exploration missions with landing and surface sampling elements. Therefore, the Jet Propulsion Laboratory (JPL) and the German Aerospace Center (DLR) are working together to develop physics-based plume contamination models for icy moon landings with an experimental testing campaign of monopropellant hydrazine thrusters underway in DLR’s STG-CT vacuum chamber facility. Recent numerical efforts have focused on the development by both JPL and DLR of steady-state plume models within STG-CT, intended to predict and interpret the results of the testing campaign. JPL employed a hybrid, one-way-coupled computational fluid dynamics (CFD) / direct simulation Monte Carlo (DSMC) scheme, in which rarefied and free-molecular flow in the far-field was calculated with the DSMC solver SPARTA and initialized at a coupling surface generated with STAR CCM+. DLR used a Fokker-Planck approach to model the same STG-CT plume flows, and preliminary comparisons between the JPL CFD / DSMC and DLR FP schemes generally show good agreement in both nozzle exit plane and far-field properties. In the DSMC approach, JPL compared the serial particle-selection implementation of Bird and the particle-selection prohibiting double relaxation method of Haas. Unless double relaxation of both particles is prohibited, the Bird method is not well-suited for gas mixtures with differing relaxation rates and internal DOF per polyatomic species. It works best when gases are vibrationally frozen, the rotational energies of colliding species have the same number of DOF and relaxation rates.

Item URL in elib:https://elib.dlr.de/146993/
Document Type:Conference or Workshop Item (Speech)
Title:Europa Lander Plume-Induced Contamination: DSMC Modeling of Monopropellant Plume Testing
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Conte, Antoniettaantonietta.conte (at) polito.itUNSPECIFIED
Hoey, W. A.JPL, California Institute of Technology, USAUNSPECIFIED
Wong, A.JPL, California Institute of Technology, USAUNSPECIFIED
Soares, Carlos E.carlos.e.soares (at) nasa.jpl.govUNSPECIFIED
Grabe, MartinMartin.Grabe (at) dlr.dehttps://orcid.org/0000-0003-0361-2734
Hepp, ChristianChristian.Hepp (at) dlr.dehttps://orcid.org/0000-0001-8465-9926
Date:8 July 2021
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Editors:
EditorsEmailEditor's ORCID iD
UNSPECIFIEDRGDUNSPECIFIED
Status:Published
Keywords:plume contamination, DSMC, monopropellant
Event Title:re-RGD32 Online Workshop on Recent Hot Topics in Rarefied Gas Dynamics
Event Location:online
Event Type:Workshop
Event Dates:07.-10. Jul. 2021
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: Grabe, Martin
Deposited On:09 Dec 2021 14:02
Last Modified:09 Dec 2021 14:02

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