RS-68火箭发动机:修订间差异

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|description=
|description=
|thrust(SL)= '''RS-68:''' {{convert|2,950|kN|lbf|abbr=on|disp=flip}}<br>'''RS-68A:''' {{convert|3137|kN|lbf|abbr=on|disp=flip}}
|thrust(SL)= '''RS-68:''' {{convert|2,950|kN|lbf|abbr=on|disp=flip}}<br>'''RS-68A:''' {{convert|3137|kN|lbf|abbr=on|disp=flip}}
|specific_impulse_vacuum= '''RS-68:''' {{convert|410|isp|abbr=on}}<br>'''RS-68A:''' {{convert|412|isp|abbr=on}}<ref>{{Cite web|url = http://www.ulalaunch.com/uploads/docs/Launch_Vehicles/Delta_IV_Users_Guide_June_2013.pdf|title = Delta IV User's Guide|accessdate = June 2013|website = |publisher = ULA|last = |first = |archive-url = https://web.archive.org/web/20140710005717/http://www.ulalaunch.com/uploads/docs/Launch_Vehicles/Delta_IV_Users_Guide_June_2013.pdf|archive-date = 2014-07-10|dead-url = yes}}</ref>
|specific_impulse_vacuum= '''RS-68:''' {{convert|410|isp|abbr=on}}<br>'''RS-68A:''' {{convert|412|isp|abbr=on}}<ref>{{Cite web|url = http://www.ulalaunch.com/uploads/docs/Launch_Vehicles/Delta_IV_Users_Guide_June_2013.pdf|title = Delta IV User's Guide|accessdate = June 2013|website = |publisher = ULA|last = |first = |||}}</ref>
|chamber_pressure= {{convert|1,488|psi|MPa|abbr=on}}
|chamber_pressure= {{convert|1,488|psi|MPa|abbr=on}}
|burn_time=
|burn_time=
|dry_weight='''RS-68:''' {{convert|14560|lb|kg|abbr=on}}<br>'''RS-68A:''' {{convert|14870|lb|kg|abbr=on}}<ref>{{Cite web |url= http://www.ulalaunch.com/products_deltaiv.aspx |title= DELTA IV |website= |publisher= ULA |last= |first= |accessdate= July 2014 |archive-url= https://web.archive.org/web/20140720073154/http://www.ulalaunch.com/Products_DeltaIV.aspx |archive-date= 2014-07-20 |dead-url= yes }}</ref>
|dry_weight='''RS-68:''' {{convert|14560|lb|kg|abbr=on}}<br>'''RS-68A:''' {{convert|14870|lb|kg|abbr=on}}<ref>{{Cite web |url= http://www.ulalaunch.com/products_deltaiv.aspx |title= DELTA IV |website= |publisher= ULA |last= |first= |accessdate= July 2014 |||}}</ref>
|length= {{convert|5.20|m|ft|abbr=on|disp=flip}}
|length= {{convert|5.20|m|ft|abbr=on|disp=flip}}
|diameter= {{convert|2.43|m|ft|abbr=on|disp=flip}}
|diameter= {{convert|2.43|m|ft|abbr=on|disp=flip}}
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== 未来计划 ==
== 未来计划 ==
2006年5月18日,NASA宣布[[战神五号]]上原计划使用的SSME将被五台RS-68替换。NASA看中RS-68也是因为它的低廉造价,在被NASA改进后,每台RS-68的成本也只有2000万美元。NASA对RS-68的改进包括替换了一个新的烧蚀喷嘴以适应增长的燃烧时间;缩短启动流程;更换了限制点火时氢逸出的设备;减少发射倒计时时氢的用量。改进后的RS-68的推力和比冲都会上升。<ref>{{cite press release | publisher=NASA | date=2006-05-18 | title=NASA's Exploration Systems Progress Report | url=http://www.nasa.gov/home/hqnews/2006/may/HQ_06226_RS-68_ENGINE.html | accessdate=2006-05-30 | archive-date=2012-03-28 | archive-url=https://www.webcitation.org/66Vmj3FML?url=http://www.nasa.gov/home/hqnews/2006/may/HQ_06226_RS-68_ENGINE.html | dead-url=no }}</ref>现在战神五号已计划使用六台RS-68。
2006年5月18日,NASA宣布[[战神五号]]上原计划使用的SSME将被五台RS-68替换。NASA看中RS-68也是因为它的低廉造价,在被NASA改进后,每台RS-68的成本也只有2000万美元。NASA对RS-68的改进包括替换了一个新的烧蚀喷嘴以适应增长的燃烧时间;缩短启动流程;更换了限制点火时氢逸出的设备;减少发射倒计时时氢的用量。改进后的RS-68的推力和比冲都会上升。<ref>{{cite press release | publisher=NASA | date=2006-05-18 | title=NASA's Exploration Systems Progress Report | url=http://www.nasa.gov/home/hqnews/2006/may/HQ_06226_RS-68_ENGINE.html | accessdate=2006-05-30 | | | }}</ref>现在战神五号已计划使用六台RS-68。


另有计划将两至三台RS-68用于[[DIRECT]]计划。
另有计划将两至三台RS-68用于[[DIRECT]]计划。
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== 外部链接 ==
== 外部链接 ==
* [https://web.archive.org/web/20080418222428/http://www.pw.utc.com/vgn-ext-templating/v/index.jsp?vgnextrefresh=1&vgnextoid=cc242b1f547ee010VgnVCM100000c45a529fRCRD 洛克达因的RS-68介绍]
* [http://www.pw.utc.com/vgn-ext-templating/v/index.jsp?vgnextrefresh=1&vgnextoid=cc242b1f547ee010VgnVCM100000c45a529fRCRD 洛克达因的RS-68介绍]
* [http://www.astronautix.com/engines/rs68.htm 宇航百科上的RS-68条目]
* [http://www.astronautix.com/engines/rs68.htm 宇航百科上的RS-68条目]