| 摘要 |
PROBLEM TO BE SOLVED: To increase a safety margin, the operation reliability and the operation life of a spacecraft rocket engine by providing a coolant recirculating means for recirculating a coolant fluid in a recirculation loop among a coolant fluid reservoir and an engine and a propellant pipe supplying means. SOLUTION: In the rocket engine 1 of a binary propellant type, a propellant oxidant 5 in a storage tank (reservoir) 3 having a pressure applied are supplied via a propellant valve 9, and propellant fuel 4 in a storage tank (reservoir) 2 is supplied via a fuel valve 10. Coolant fluid is circulated by a coolant recirculating means including heat exchangers 13 to 15, a coolant pump 17, a coolant fluid reservoir 19 and a coolant valve 21. The rocket engine 1 itself is cooled by the heat exchanger 13 placed in a conductive state and, by the heated coolant fluid, the propellant oxidant 5 is heated by the heat exchanger 15.
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