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RD-180

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RD-180
RD-180 test firing atMarshall Space Flight Center
Country of originRussia
First flight24 May 2000(2000-05-24)
DesignerNPO Energomash
ManufacturerNPO Energomash
ApplicationBooster
PredecessorRD-170
StatusActive
Liquid-fuel engine
PropellantLOX/RP-1
Mixture ratio2.72 (73%O
2,27% RP-1)
CycleStaged combustion
Configuration
Chamber2
Nozzle ratio36.87
Performance
Thrust, vacuum4,150 kN (930,000 lbf)
Thrust, sea-level3,830 kN (860,000 lbf)
Throttle range47–100%
Thrust-to-weight ratio78.44
Chamberpressure26.7 MPa (3,870 psi)
Specific impulse,vacuum338 s (3.31 km/s)
Specific impulse,sea-level311 s (3.05 km/s)
Mass flow1,250 kg/s (165,000 lb/min)
Burn time270 seconds
Dimensions
Length3.56 m (11.7 ft)
Diameter3.15 m (10.3 ft)
Dry mass5,480 kg (12,080 lb)
A model of the RD-180

TheRD-180(Russian:Ракетный Двигатель-180 (РД-180),romanized:Raketnyy Dvigatel-180,lit. 'Rocket Engine-180') is arocket enginethat was designed and built in Russia. It features a dualcombustion chamber,dual-nozzledesign and is fueled by aRP-1/LOXmixture. The RD-180 is derived from theRD-170line of rocket engines, which were used in the SovietEnergia launch vehicle.The engine was developed for use on the USAtlas IIIandAtlas Vlaunch vehiclesand first flew in 2000. It was never used on any other rocket. The engine has flown successfully on all six Atlas III flights and on 99 Atlas V flights, with just a single non-critical failure in March 2016.

Atlas V is being phased out due to the national security implications of reliance on the Russian-built engine,[1]which became a concern after theRussian annexation of Crimea.In 2021, Atlas manufacturerUnited Launch Allianceannounced that it was retiring the Atlas V and that it had already taken delivery of the RD-180 engines for the remaining rockets.[2]As of June 2024,16 launches remain. In 2022, Russian supplies and maintenance were discontinued as the result of trade sanctions imposed after the2022 Russian invasion of Ukraine.

Design and specifications

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Schematic of the RD-180 engine:
  • Helium
  • Low-pressure liquid oxygen
  • Low-pressure liquid fuel
  • High-pressure liquid fuel
  • High-pressure gaseous oxygen and preburner combustion products
EHA
Electro-hydraulic actuator
MR control EHA
Mix-ratio control EHA
PB fuel valve
Pre-burner fuel valve

The combustion chambers of the RD-180 share a single turbopump unit, much like in its predecessor, the four-chamberedRD-170.The RD-180 is fueled by anRP-1/LOXmixture and uses an extremely efficient, high-pressurestaged combustion cycle.The engine runs with an oxidizer-to-fuel ratio of 2.72 and employs an oxygen-rich preburner, unlike typical fuel-rich US designs.

The thermodynamics of the cycle allow an oxygen-rich preburner to give a greaterpower-to-weight ratio,but with the drawback that high-pressure, high-temperature gaseous oxygen must be transported throughout the engine. If the surfaces contacting this oxygen were bare metal, they would corrode too quickly. The RD-180 solves this problem using an inert enamel coating on all metal surfaces in contact with the hot oxygen.[3]

The movements of the engine nozzles are controlled by fourhydraulic actuators.The engine can be throttled from 47% to 100% of nominal thrust.[4]

History

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The roots of the RD-180 rocket engine extend to the SovietEnergialaunch vehicle. The RD-170, a four-chamber engine, was developed for use in the strap-on boosters for this vehicle, which ultimately launched theBuran orbiter.This engine was scaled down to a two-chamber version by combining the RD-170's combustion devices with half-size turbomachinery. After successful performance on a test stand and high-level agreements between theUS governmentand theRussian government,the engines were imported to the US for use on theLockheed MartinAtlas III,which flew from 2000 to 2005. The engine has been used since 2002 on theUnited Launch AllianceAtlas V,the successor to the Atlas III.[5]

The engine has design features similar[clarification needed]to theNK-33,which was developed by a different bureau (Kuznetzov) nearly a decade earlier.

2014–2015 availability concerns

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Doubts about thereliability of the supply chainfor the RD-180 arose following theRussian military intervention in Ukrainein March 2014. For over 13 years since the engine was first used in the Atlas III launch vehicle in 2000, there was no serious jeopardy to the engine supply, despite an uneven record of US–Russian relations since theCold War.However, worsening relations between the West and Russia after March 2014 led to several self-imposed blockages, including a short-lived judicial injunction from the US courts that was unclear whether the scope of the USsanctionscovered importing the Russian engine.[6]

On 13 May 2014, Russian Deputy Prime MinisterDmitry Rogozinannounced that "Russia will ban the United States from using Russian-made rocket engines for military launches"[7]—a frequent payload of theULAAtlas Vlaunch vehicle, which powers its first stage with a single RD-180 engine that isexpendedafter each flight.[8]In response, theUS Air Forceasked theAerospace Corporationto evaluate alternatives for powering the Atlas 5 booster with non-RD-180 engines. Early estimates in 2014 were that it would require five or more years to replace the RD-180 on the Atlas V.[9]

Even though the Russian government could cut off the supply to ULA of imported RD-180 engines, theUS Congress,with emerging support from theAir Force,came to the view that it would not be advantageous to build a US production line for the RD-180, mainly because it would need a license from the Russian government. However, the US Congress in 2014 advocated a new US rocket engine program to field a new engine by 2022.[10]

In June 2014,Aerojet Rocketdyneproposed that the federal government "fund an all-new, U.S.-sourced rocket propulsion system", the 2,200-kilonewton-class (500,000 lbf) thrust kerosene/LOXAR-1 rocket engine.As of June 2014,Aerojet's projection was that the cost of each engine would be underUS$25 millionper pair of engines—not including the up toUS$1 billiondevelopment cost to be funded by the US Government. Aerojet believed that the AR-1 could replace the RD-180 in the USEvolved Expendable Launch Vehiclefleet, and that it would be more affordable.[11]

On 21 August 2014, the U.S. Air Force released an officialrequest for information(RFI) for a replacement for the RD-180. The RFI seeks information on "booster propulsion and/or launch system material options that could deliver cost-effective, commercially-viable solutions for current and future National Security Space (NSS) launch requirements.Air Force Space Command(AFSPC) is considering an acquisition strategy to stimulate the commercial development of booster propulsion systems and/or launch systems forEvolved Expendable Launch Vehicle(EELV)-class spacelift applications. "The day before, theUnited Launch Alliancehad taken delivery of two RD-180s, the first since theRussian annexation of Crimea.It was not clear when or if the RD-180 would be replaced, and the RFI asked for several options including similarity to the Russian engine, whether it would come in a new configuration and the use of "alternative launch vehicles" for the EELV mission.[12]

In 2014, RD-Amross were selling the RD-180s (to ULA) for $23.4m each.[13]

In January 2015, Orbital Sciences Corporation received all the necessary permissions from government bodies for the delivery of 60 engines from NPO Energomash.[14]

On 24 December 2015, United Launch Alliance announced that it had placed an order for more RD-180 engines to be used by the Atlas V launch vehicle, in addition to 29 engines that the company had ordered before US sanctions were imposed on Russia over Crimea, and just days after the US Congress lifted the ban on Russian engines for American rockets.[citation needed]

Planned US production of the RD-180

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There were several plans to manufacture the RD-180 in the US, but none of them came to fruition.

UnderRD AMROSS,Pratt & Whitney is licensed to produce the RD-180 in the United States. According to a 2005 GAO Assessment of Selected Major Weapon Programs, Pratt & Whitney planned to start building the RD-180 in the United States in 2008 with a first military launch by 2012,[15]but this did not occur.

United Launch Alliance (ULA) announced in February 2015 that it was considering undertaking US production of the Russian RD-180 engine at theDecatur,Alabama, rocket stage manufacturing facility. The US-manufactured engines would be used only for government civil (NASA) and commercial launches, not for US military launches. This project was a backup plan to the new engine development work by ULA withBlue Originon theBE-4.[16] In 2014, the Defense Department estimated that it would require approximately $1 billion and five years to begin US domestic manufacture of the RD-180 engine.[17]

Overall, by April 14, 2021Energomashdelivered 122 RD-180 rocket engines to the United States over more than 20 years.[18]

In an interview on August 26, 2021, ULA's CEOTory Brunosaid that three or four RD-180s were installed on Atlas V rockets for upcoming missions, and the rest were sitting in a warehouse. “We took early delivery, if you will, with the RD-180, so I can end that relationship and not be dependent upon [Russia] because that’s what Congress asked us to do”, he said. The 122 RD-180 engines fromEnergomashgenerated billions in revenue for Russia's space program.[19]

Replacement options for the RD-180

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Several options for replacing the RD-180 on Atlas V were investigated, but ULA ultimately decided to replace the rocket withVulcan Centaurinstead.

In February 2010, despite the availability of necessary documentation and legal rights for producing RD-180 in the United States,NASAwas considering development of an indigenous core-stage engine that would be "capable of generating high levels of thrust approximately equal to or exceeding the performance of the Russian-built engine". NASA desired to produce a fully operational engine by 2020 or sooner, depending on partnership with the U.S. Defense Department.[20]

As a result of the geopolitical and USpoliticalconsiderations, United Launch Alliance considered a possible replacement for the Russian RD-180 engine used on the first-stage booster of the ULA Atlas V. Formal study contracts were issued in June 2014 to a number of US rocket-engine suppliers.[1]

In September 2014, ULA announced that it had entered into a partnership withBlue Originto develop theBE-4LOX/methaneengine to replace the RD-180 on a newfirst-stage boosterthat wouldsucceed the Atlas V.At the time, the engine was already in its third year of development by Blue Origin, and ULA expected the new stage and engine to start flying no earlier than 2019. Two of the 2,400-kilonewton(550,000lbf)-thrust BE-4 engines would be used on the new launch vehicle booster.[1]

Dynetics and Aerojet Rocketdyne (AJR) also offered theirAR1hydrocarbon-fueled rocket engine as replacement of the RD-180.[21][22]ULA CEO Tory Bruno said in early 2015 that both the AR-1 option and the US manufacture of the RD-180 by ULA under license were backup options to the primary option ULA was pursuing with the Blue Origin BE-4 engine.[16] By March 2016, theUS Air Forcehad signed development contracts with AJR and Blue Origin to fund development for both engines.[23]

The firstVulcanflight with new engines occurred in January 2024.[24]

As of May 25, 2020 (20 years since the first launch of the Atlas LV with RD-180), all 90 launches so far were recognized as successful.[by whom?]

Applications

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During the early 1990s,General DynamicsSpace Systems Division (later purchased byLockheed Martin) acquired the rights to use the RD-180 in theEvolved Expendable Launch Vehicle(EELV) and theAtlas program.As these programs were conceived to support United States Government launches, as well as commercial launches, it was also arranged for the RD-180 to be co-produced byPratt & Whitney.However, all production took place in Russia. The engine was sold by a joint venture between the Russian developer and producer of the engineNPO Energomashand Pratt & Whitney, calledRD Amross.

The RD-180 was first deployed on the Atlas IIA-R vehicle, which was theAtlas IIAvehicle with the Russian (hence the R) engine replacing the previous main engine. This vehicle was later renamed theAtlas III.An additional development program was undertaken to certify the engine for use on the modularCommon Core Boosterprimary stage of theAtlas V rocket.

Prospective uses

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RD-180 was proposed to be used[25]with a new family ofRus-MRussian space launch vehicles, proposed byRoskosmoscontractors,[26][27]but the program was canceled by the Russian Space Agency in October 2011.[28]

In March 2010, Jerry Grey, a consultant to theAmerican Institute of Aeronautics and AstronauticsandUniversities Space Research Associationand a former professor of aerospace engineering atPrinceton University,suggested using the RD-180 for a prospective NASA heavy-lift launch vehicle. For those who might be concerned about too much reliance on Russia, he pointed out that RD Amross was "very close to producing a U.S.-built version of the RD-180, and with some infusion of NASA funding could be manufacturing that engine (and perhaps even a 1,700,000 lbf or 7.6 MN thrust equivalent of the RD-170) in a few years".[29]

2022 Russian invasion of Ukraine

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On February 24, 2022, Russia begana large-scale military invasion of Ukraine.Six days later on March 2, 2022, as Russia continued the invasion, they announced an end of all sales and support of the RD-180 engines to the United States, in retaliation for sanctions placed on Russia by the US for the Ukraine attack.[30]

See also

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References

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  1. ^abcFerster, Warren (17 September 2014)."ULA To Invest in Blue Origin Engine as RD-180 Replacement".SpaceNews. Archived fromthe originalon 18 September 2014.Retrieved19 September2014.
  2. ^Roulette, Joey (26 August 2021)."ULA stops selling its centerpiece Atlas V, setting path for the rocket's retirement".The Verge.Retrieved1 September2021.
  3. ^Reusable Booster System: Review and Assessment.National Academic Press. January 2013. p. 29.ISBN978-0-309-26656-7.Retrieved23 July2024.
  4. ^Atlas V Launch Services User's Guide(PDF)(Rev. 11 ed.). Centennial, CO: United Launch Alliance. March 2010. pp. A8-9.Archived(PDF)from the original on 14 December 2020.Retrieved6 December2020.
  5. ^The Engines That Came In From The Cold!.Channel Four Television Corporation. 2000.Retrieved19 May2014.
  6. ^Foust, Jeff (12 May 2014)."Replacing the RD-180".The Space Review.Archivedfrom the original on 14 May 2014.Retrieved13 May2014.
  7. ^"Russia responds to US sanctions over Ukraine".ITV news.13 May 2014.Archivedfrom the original on 14 May 2014.Retrieved13 May2014.
  8. ^Gopal Ratnam and Henry Meyer (13 May 2014)."Russia Bans Rocket Engine Sales to U.S. Military".Bloomberg.Archivedfrom the original on 14 November 2014.Retrieved28 December2014.
  9. ^de Selding, Peter B. (19 May 2014)."Estimates on Time Needed to Replace RD-180 Vary Widely".Space News.Archived fromthe originalon 19 May 2014.Retrieved16 May2014.
  10. ^"Support Grows For New U.S. Rocket Engine".Aviation Week.26 May 2014.Archivedfrom the original on 27 May 2014.Retrieved27 May2014.
  11. ^Butler, Amy (3 June 2014)."Aerojet Rocketdyne Targets $25 Million Per Pair For AR-1 Engines".Aviation Week. Archived fromthe originalon 1 July 2014.Retrieved16 June2014.Aerojet Rocketdyne is targeting a cost of $20–25 million for each pair of new AR-1 engines as the company continues to lobby the government to fund an all-new, U.S.-sourced rocket propulsion system... The effort to build a new, 500,000-lb. thrust liquid oxygen/kerosene propulsion system would take about four years from contract award and cost roughly $800 million to $1 billion. Such an engine is eyed for United Launch Alliance's (ULA) Atlas V rocket as well as Orbital's Antares.… [we] 'believe [the AR-1 will be] on a par – if not better – than the performance of the RD-180. We also believe it is going to be more affordable,'
  12. ^"Air Force issues RFI for new rocket engine to replace Russian-made model".Air Force Times. 21 August 2014.Retrieved11 February2023.
  13. ^ReutersIn Pentagon deal with Russians, big profit for tiny Florida firmnov 2014Archived22 February 2019 at theWayback Machine.
  14. ^"US to buy 60 Russian rocket engines worth $1 bln — company".itar-tass.Archivedfrom the original on 19 January 2015.Retrieved10 April2018.
  15. ^"DEFENSE ACQUISITIONS: Assessments of Selected Major Weapon Programs"(PDF).United States Government Accountability Office(GAO).March 2005. p. 56.Archived(PDF)from the original on 18 January 2021.Retrieved4 September2021.
  16. ^abFleischauer, Eric (7 February 2015)."ULA's CEO talks challenges, engine plant plans for Decatur".Decatur Daily.Archivedfrom the original on 12 June 2017.Retrieved9 February2015.
  17. ^"U.S. RD-180 Coproduction Would Cost $1 Billion | Aviation Week Network".aviationweek.Archivedfrom the original on 4 September 2021.Retrieved5 October2021.
  18. ^"Russia hands over last RD-180 rocket engines to US under existing deal".Archivedfrom the original on 25 July 2021.Retrieved4 September2021.
  19. ^Roulette, Joey (26 August 2021)."ULA stops selling its centerpiece Atlas V, setting path for the rocket's retirement".The Verge.Archivedfrom the original on 4 September 2021.Retrieved4 September2021.
  20. ^"NASA Propulsion Plans Resonate with Some in Rocket Industry".SpaceNews.26 February 2010.Retrieved28 December2014.
  21. ^"Aerojet Rocketdyne Targets $25 Million Per Pair For AR-1 Engines".Archived fromthe originalon 1 July 2014.Retrieved16 June2014.
  22. ^"Spaceflight Now – Breaking News – Aerojet Rocketdyne says AR1 engine is best fit for Atlas 5".spaceflightnow.Archivedfrom the original on 12 September 2015.Retrieved10 April2018.
  23. ^Clark, Stephen."ULA's candidates to replace RD-180 engine win Air Force funding – Spaceflight Now".Archivedfrom the original on 13 August 2021.Retrieved5 October2021.
  24. ^McCrea, Aaron (8 January 2024)."Vulcan successfully launches Peregrine lunar lander on inaugural flight".NASASpaceFlight.Retrieved7 April2024.
  25. ^"Roscosmos designing a new space rocket complex Rus-M — Encyclopedia of safety".survincity.Archivedfrom the original on 30 November 2020.Retrieved5 October2021.
  26. ^"РИА Наука – РИА Новости".Rian.ru. Archived fromthe originalon 8 September 2012.Retrieved28 December2014.
  27. ^"Rus M: RD-180".Russianspaceweb.Archivedfrom the original on 27 February 2019.Retrieved28 December2014.
  28. ^"Replacement for Soyuz rocket canned by Russia".Spaceflight Now. 7 October 2011.Archivedfrom the original on 2 November 2011.Retrieved8 October2011.
  29. ^"Laying a Foundation for Human Space Exploration - SpaceNews".spacenews.29 March 2010.Archivedfrom the original on 5 October 2021.Retrieved10 April2018.
  30. ^"Russia is stopping rocket engine sales to the US and their space chief said, 'Let them fly on something else, their broomsticks'".MSN.Retrieved4 March2022.
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