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Numerical Investigation of Two Interacting Parallel Thruster-Plumes and Comparison to Experiment

Grabe, Martin and Holz, Andre and Dettleff, Georg and Ziegenhagen, Stefan and Hannemann, Klaus (2014) Numerical Investigation of Two Interacting Parallel Thruster-Plumes and Comparison to Experiment. 29th International Symposium on Rarefied Gas Dynamics, 13. - 18. Juli 2014, Xi´an, China.

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Official URL: http://www.rgd29.org/

Abstract

Clusters of orbital thrusters are an attractive option to achieve graduated thrust levels and increased redundancy with available hardware, but the heavily under-expanded plumes of chemical attitude control thrusters placed in close proximity will interact, leading to a local amplification of downstream fluxes and of back-flow onto the spacecraft. As ground-based experimental investigation of most technically relevant hot plume interaction flow-fields is not feasible, a joint approach is necessary to understand and predict the non-linear effects of plume-plume interaction, involving model experiments to gain confidence in the results of numerical methods. The interaction of two similar, parallel, axisymmetric cold-gas model thrusters has recently been studied in the DLR High-Vacuum Plume Test Facility STG under space-like vacuum conditions, employing a Patterson-type impact pressure probe with slot orifice. In this paper, we reproduce a selection of these experiments numerically, using a 3D parallelised implementation of the DSMC method to compute the plume expansion and interaction, while the flow-field inside the nozzles is obtained by the DLR Navier-Stokes solver TAU. We emphasise that a comparison of numerical results to the measured data is not straight-forward. The signal of the probe used in the experiments must be interpreted according to the degree of rarefaction and local flow Mach number, and both vary dramatically thoughout the flow-field. We present a procedure to reconstruct the probe signal by post-processing the numerically obtained flow-field data and show that good agreement to the experimental results is then achieved. On the basis of the numerical results, the features of the investigated cold-gas thruster plume interaction and are discussed.

Item URL in elib:https://elib.dlr.de/88793/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Paper-Nr.: RGD29-2014_S8-05, the Proceedings of the 29th RGD will be assembled by the American Institut of Physics (AIP). The submitted papers will be reviewed and then tentatively scheduled to be published in November 2014.
Title:Numerical Investigation of Two Interacting Parallel Thruster-Plumes and Comparison to Experiment
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Grabe, Martinmartin.grabe (at) dlr.deUNSPECIFIED
Holz, AndreAirbus D&SUNSPECIFIED
Dettleff, GeorgDLR GöttingenUNSPECIFIED
Ziegenhagen, StefanAirbus D&SUNSPECIFIED
Hannemann, KlausDLR GöttingenUNSPECIFIED
Date:2014
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-8
Series Name:Konference Proceedings (siehe zusätzliche Informationen)
Status:Published
Keywords:Plume Interaction, DSMC, Patterson-Probe
Event Title:29th International Symposium on Rarefied Gas Dynamics
Event Location:Xi´an, China
Event Type:international Conference
Event Dates:13. - 18. Juli 2014
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 - Raumfahrzeugsysteme - Anlagen u. Messtechnik
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Spacecraft
Deposited By: Micknaus, Ilka
Deposited On:17 Sep 2014 09:46
Last Modified:17 Sep 2014 09:46

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