| 词条 | MHW-RTG | |||
| 释义 |
The Multihundred-Watt radioisotope thermoelectric generators (MHW RTG) is a type of US radioisotope thermoelectric generator (RTG) developed for the Voyager spacecrafts, Voyager 1 and Voyager 2.[1] Each RTG had a total weight of 37.7 kg including about 4.5 kg of Pu-238.[2] It uses 24 pressed plutonium-238 oxide spheres and provides enough heat to generate approximately 157 watts of electrical power initially - halving every 87.7 years. Each RTG generated about 2400 Watts of thermal power.[3] Conversion of the decay heat of the plutonium to electrical power used 312 silicon-germanium (SiGe) thermoelectric couples. The initial thermoelectric couple hot junction temperature was 1273 K (1000 °C, 1832 °F) with a cold junction temperature of 573 K (300 °C, 572 °F).[4] Each Voyager spacecraft has 3 RTGs. Collectively, the RTGs supplied each Voyager spacecraft with 470 watts at launch.[5][6] MHW-RTGs were used on the Lincoln Experimental Satellites 8 and 9. Subsequent US spacecraft used the GPHS-RTG which used similar SiGe thermoelectic devices but a different packaging of the fuel. The MMRTG is a newer RTG type, used on the Curiosity rover. References1. ^{{Cite journal|url=http://www.stickings90.webspace.virginmedia.com/voyager.htm |archive-url=https://web.archive.org/web/20140331162615/http://www.stickings90.webspace.virginmedia.com/voyager.htm |dead-url=yes |archive-date=2014-03-31 |title=The Voyager Space Craft |journal=Proceedings of the Institution of Mechanical Engineers |volume=194 |pages=267–270 |year=1980 |author=Heacock }} 2. ^"Space Nuclear Power" G.L.Bennett 2006 3. ^{{cite web |url=http://www.totse.com/en/technology/space_astronomy_nasa/spacnuke.html |title=Archived copy |accessdate=2012-10-19 |deadurl=yes |archiveurl=https://web.archive.org/web/20080619143130/http://www.totse.com/en/technology/space_astronomy_nasa/spacnuke.html |archivedate=2008-06-19 |df= }} 4. ^{{cite journal |last1=Furlong |first1=Richard R. |last2=Wahlquist |first2=Earl J. |year=1999 |title=U.S. space missions using radioisotope power systems |journal=Nuclear News |volume=42 |issue=4 |pages=26–34 |url=http://www2.ans.org/pubs/magazines/nn/pdfs/1999-4-2.pdf |accessdate=January 2, 2011 }} 5. ^{{cite web|url=http://starbrite.jpl.nasa.gov/pds/viewHostProfile.jsp?INSTRUMENT_HOST_ID=VG2 |title=VOYAGER 2:Host Information |year=1989 |publisher=NASA |accessdate=January 2, 2011 |deadurl=yes |archiveurl=https://web.archive.org/web/20110721050912/http://starbrite.jpl.nasa.gov/pds/viewHostProfile.jsp?INSTRUMENT_HOST_ID=VG2 |archivedate=July 21, 2011 |df= }} 6. ^{{cite web|title=Voyager 2 Craft Details|url=http://nssdc.gsfc.nasa.gov/nmc/spacecraftDisplay.do?id=1977-076A|work=NASA-NSSDC-Spacecraft-Details|publisher=NASA|accessdate=March 9, 2011}} See also
2 : Nuclear power in space|Voyager program |
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