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기술보고서

기술보고서 게시판 내용
타이틀	Natural Convection Cooling of the Advanced Stirling Radioisotope Generator Engineering Unit
저자	Lewandowski, Edward J.;; Hill, Dennis
Keyword	FINS;; FORCED CONVECTION;; FREE CONVECTION;; GROUND OPERATIONAL SUPPORT SYSTEM;; LAUNCH VEHICLES;; PRESSURE VESSELS;; REFUELING;; SPACE PROBES;; STIRLING CYCLE
URL	http://hdl.handle.net/2060/20110023426
보고서번호	NASA/TM-2011-217101
발행년도	2011
출처	NTRS (NASA Technical Report Server)
ABSTRACT	After fueling and prior to launch, the Advanced Stirling Radioisotope Generator (ASRG) will be stored for a period of time then moved to the launch pad for integration with the space probe and mounting on the launch vehicle. During this time, which could be as long as 3 years, the ASRG will operate continuously with heat rejected from the housing and fins. Typically, the generator will be cooled by forced convection using fans. During some of the ground operations, maintaining forced convection may add significant complexity, so allowing natural convection may simplify operations. A test was conducted on the ASRG Engineering Unit (EU) to quantify temperatures and operating parameters with natural convection only and determine if the EU could be safely operated in such an environment. The results show that with natural convection cooling the ASRG EU Stirling convertor pressure vessel temperatures and other parameters had significant margins while the EU was operated for several days in this configuration. Additionally, an update is provided on ASRG EU testing at NASA Glenn Research Center, where the ASRG EU has operated for over 16,000 hr and underwent extensive testing.