1. Numerical Investigation of Two Interacting Parallel Thruster-Plumes and Comparison to Experiment.
- Author
-
Grabe, Martin, Holz, André, Ziegenhagen, Stefan, and Hannemann, Klaus
- Subjects
- *
SPACE vehicles , *PLUMES (Fluid dynamics) , *NUMERICAL analysis , *CLUSTER analysis (Statistics) , *THRUST -- Aerodynamics , *MACH number - 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. The interaction of two similar, parallel, axi-symmetric 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. We reproduce a selection of these experiments numerically, and 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 agreement to the experimental results is then improved. Features of the investigated cold-gas thruster plume interaction are discussed on the basis of the numerical results. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF