| 词条 | HG-3 (rocket engine) |
| 释义 |
|name =HG-3 |image = |image_size = |caption = |country_of_origin=United States |date = |first_date = |last_date = |designer =MSFC/Rocketdyne |manufacturer =Rocketdyne |purpose =Upper stage engine |associated =Saturn MLV Saturn IB-B Saturn V/4-260 Saturn INT-17 |predecessor =J-2 |successor =RS-25 |status =Cancelled during development. |type =liquid |oxidiser =Liquid oxygen |fuel =Liquid hydrogen |mixture_ratio = |cycle = |pumps = |description = |combustion_chamber= |nozzle_ratio = |thrust = |thrust_at_altitude= |thrust(Vac) ={{Convert|1400.7|kN|abbr=on}} |thrust(SL) ={{Convert|869.6|kN|abbr=on}} |thrust_to_weight= |chamber_pressure= |specific_impulse= |specific_impulse_vacuum={{convert|451|isp}} |specific_impulse_sea_level={{convert|280|isp}} |total_impulse = |burn_time = |capacity = |dimensions = |length = |diameter = |dry_weight = |used_in = |references =[1][2] |notes = }} The HG-3 was a liquid-fuel cryogenic rocket engine which was designed for use on the upper stages of Saturn rockets in the post-Apollo era.[1] Designed in the United States by Rocketdyne, the HG-3 was to have burned cryogenic liquid hydrogen and liquid oxygen propellants, with each engine producing {{convert|1400.7|kN|abbr=on|sigfig=3}} of thrust during flight.[1] The engine was designed to produce a specific impulse (Isp) of 451 seconds in a vacuum, or 280 seconds at sea level.[1] Developed from Rocketdyne's J-2 engine used on the S-II and S-IVB stages, the engine was intended to replace the J-2 on the upgraded S-II-2 and S-IVB-2 stages intended for use on the Saturn MLV, Saturn IB-B and Saturn V/4-260 rockets, with a sea-level optimised version, the HG-3-SL, intended for use on the Saturn INT-17.[1][2] The engine was cancelled, however, during the post-Apollo drawdown when development of the more advanced Saturn rockets ceased, and never flew, although the engine was later used as the basis for the design of the RS-25 Space Shuttle main engine.[3] See also
References1. ^1 2 3 4 {{cite web|url=http://www.astronautix.com/engines/hg3.htm|publisher=Encyclopedia Astronautica|title=HG-3|accessdate=18 February 2012|date=17 November 2011|author=Mark Wade|deadurl=yes|archiveurl=https://web.archive.org/web/20111115163306/http://www.astronautix.com/engines/hg3.htm|archivedate=15 November 2011|df=}} {{Rocketry-stub}}2. ^1 {{cite web|url=http://www.astronautix.com/engines/hg3sl.htm|publisher=Encyclopedia Astronautica|title=HG-3-SL|accessdate=18 February 2012|date=17 November 2011|author=Mark Wade|deadurl=yes|archiveurl=https://web.archive.org/web/20111117134837/http://www.astronautix.com/engines/hg3sl.htm|archivedate=17 November 2011|df=}} 3. ^{{cite web|url=http://history.msfc.nasa.gov/saturn_apollo/propulsion_center.html|publisher=NASA|accessdate=13 December 2011|title=MSFC Propulsion Center of Excellence is Built on Solid Foundation|year=1995}} 3 : Rocket engines using hydrogen propellant|Rocketdyne engines|Rocket engines of the United States |
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