Sodium/GH4099 Heat Pipes for Space Reactor Cooling.

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Date: Oct. 2021
From: Microgravity - Science and Technology(Vol. 33, Issue 5)
Publisher: Springer
Document Type: Report; Brief article
Length: 199 words

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Abstract :

Keywords: Heat pipe; Space reactor cooling; Sodium; GH4099; Startup Abstract High temperature heat pipes were proposed for space reactor cooling because of their thermal efficiency, inherent safety, and self-actuating operation. Sodium/GH4099 heat pipes were designed and fabricated in China Academy of Aerospace Aerodynamics (CAAA). And their startup properties and thermal response were investigated systematically. It was found that sodium/GH4099 heat pipes startup successfully at 950 °C heating, displaying an uniform temperature of about 800 °C. On the other hand, charging ratio affected the startup properties significantly. Startup failures occurred for heat pipes with 24% and 30% sodium charging. Under simulated space reactor environment, pre-oxidation of GH4099 surfaces could decrease axial temperature of sodium/GH4099 heat pipes greatly. With pre-oxidation of GH4099, axial temperatures of heat pipes decreased from 1138--1198 °C to 890--951 °C. These temperatures were lower than the end-use temperature of GH4099 alloy. Therefore, it was concluded that pre-oxidized sodium/GH4099 heat pipes were candidate devices for space reactor cooling. Author Affiliation: (1) Laboratory of Aero-Thermal Protection Technology for Aerospace Vehicles, China Academy of Aerospace Aerodynamics, 17 Yungang West Rd., 100074, Beijing, China (a) hulongfei@spacechina.com Article History: Registration Date: 08/25/2021 Received Date: 12/12/2020 Accepted Date: 08/24/2021 Online Date: 09/15/2021 Byline:

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Gale Document Number: GALE|A675642234