Abstract
Considered as one of the most effective methods for debris mitigation, the passivation of spent upper stages is complex to define, implement and qualify. The example of the Ariane 5 EPS is given. After a short description of the selected technical solution, the paper deals with the following points: • . safety and reliability aspects linked to the passivation system, • . torque resulting from passivation, • . behaviour of hypergolic propellants after expulsion and experimental validation, • . modelisation of the payload contamination and experimental validation, • . thermodynamic behaviour of the propellant at the passivation exhausts and experimental validation, • . generation of propellant droplets in the vacuum.
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