Science, Space and Technology News 2023
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Propellant flows to the thrusters via fuel lines and then passes through smaller lines inside the thrusters called propellant inlet tubes that are 25 times narrower than the external fuel lines. Each thruster firing adds tiny amounts of propellant residue, leading to gradual buildup of material over decades. In some of the propellant inlet tubes, the buildup is becoming significant.
Engineers can’t know for sure when the thruster propellant inlet tubes will become completely clogged, but they expect that with these precautions, that won’t happen for at least five more years, possibly much longer. The team can take additional steps in the coming years to extend the lifetime of the thrusters even more.
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