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Raptor, Cryogenic methane-fueled rocket engine

Discussion in 'SpaceX' started by HVM, Aug 9, 2016.

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  1. HVM

    HVM Savolainen

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    #1 HVM, Aug 9, 2016
    Last edited: Aug 9, 2016
    WOW, SpaceX raptor program is advanced more, that I think before:

    C. G. Niederstrasser ‏@RocketScient1st

    "Shotwell - just shipped first Raptor engine to Texas last night. #SpaceX #smallsat"

    And Texas means here, the SpaceX Rocket Development and Test Facility in McGregor,

    Blah, Grendal ninjaposted me.
     
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  2. Grendal

    Grendal Active Member

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    Sorry about that.... :)
     
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  3. HVM

    HVM Savolainen

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    Raptor Specs:

    Cycle: Full-flow staged combustion
    Oxidizer: Subcooled liquid oxygen
    Fuel: Subcooled liquid methane
    Chamber Pressure: 300 bar
    Throttle Capability: 20% to 100% thrust

    Sea-Level Nozzle
    Expansion Ratio: 40
    Thrust (SL): 3,050 kN
    Isp (SL): 334 s

    Vacuum Nozzle
    Expansion Ratio: 200
    Thrust: 3,500 kN
    Isp: 382 s


    There should be two turbopumps and two pre-burners +turbines, can you find them?
    raptor.jpg
     
  4. siai47

    siai47 Member

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    I don't know anything about rocket engines---however a nice picture. Could the pumps be compound pumps? There appears to be one on the side and one of the top of the engine. The nozzle section looks more like the high bay lights in my shop---sure would be bright if lit up but would most likely clean out the shop before departing through the roof :) !
     
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  5. HVM

    HVM Savolainen

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    Nasaspaceflightcom's AP3 have same idea; guess for a flow diagram:
    Raptor_flow.jpg
    Where a LOX Pump, Turbine and the Preburners are integrated same blog as Combustion Chamber.
     
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  6. HVM

    HVM Savolainen

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    Interesting claim in NSF, about IPD and SpaceX.

    "The integrated powerhead demonstrator (IPD) was an U.S. Air Force project in the 1990s and early 2000s run by NASA and the Air Force Research Laboratory (AFRL) to develop a new rocket engine front-end (powerhead) that would utilize a full flow staged combustion cycle (FFSCC). The prime contractors were Rocketdyne and Aerojet.

    Future engine development work beyond the powerhead demo was never funded by the US government, and neither Rocketdyne—nor later Aerojet Rocketdyne after a 2013 merger—chose to pursue such development with their own or other private funding."
    -WIKI

    Apollo100 (NSF):
    "...Given that SX acquired the IPD Final report, all of the drawings, and all of the hardware, I would imagine that there is quite a bit of IPD heritage in the Raptor engine."
     
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  7. Grendal

    Grendal Active Member

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    Chris B - NSF on Twitter

    Chris B. wrote: Baby Raptor sure packs a punch! Photo by Gary Blair from an airplane over McGregor (well outside of any restricted area of course!).
    Here is the picture of the Raptor burn markings:

    Raptor.jpg
     
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  8. e-FTW

    e-FTW New electron smell

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    So, that had not planned appropriately? Sounds like a very efficient way to start a brush fire. Haha!
     
  9. Bobfitz1

    Bobfitz1 Member

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    That is an amazing photo of the Raptor burn markings. Gary Blair just missed one nearby detail!

    RaptorTest.png

    WilyRaptorTest.png
     

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  10. HVM

    HVM Savolainen

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    Raptor testing: (IAC 17)
    "Over 1200 seconds of firing across 42 main engine tests
    Longest test 100 seconds (Due test tanks size); 40 seconds typical tor Mars landing
    Test engine operates at up to 200 atmospheres (250 bar for the flight engine, 300 bar < end design target)"
    raptor_test40.jpg
     
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  11. Grendal

    Grendal Active Member

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    I expect we will see significant improvements in the Raptor engine as we've seen happen with the Merlin engine over the years. From what I'm hearing, it looks like they are moving forward with the Raptor they're testing with only slight modifications. That seems to coincide with the numbers we're seeing. It doesn't look like they're making it as large as was envisioned last year. What we do know is that the Raptor will become the main engine that SpaceX creates.
     
  12. Grendal

    Grendal Active Member

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    The Defense Department has awarded $40.75 million to further develop the Raptor engine this last Thursday.

    "Space Exploration Technologies Corp., Hawthorne, California, has been awarded a $40,766,512 modification (P00007) for the development of the Raptor rocket propulsion system prototype for the Evolved Expendable Launch Vehicle program. Work will be performed at NASA Stennis Space Center, Mississippi; Hawthorne, California; McGregor, Texas; and Los Angeles Air Force Base, California; and is expected to be complete by April 30, 2018. Fiscal 2017 research, development, test and evaluation funds in the amount of $40,766,512 are being obligated at the time of award. The Launch Systems Enterprise Directorate, Space and Missile Systems Center, Los Angeles AFB, California, is the contracting activity (FA8811-16-9-0001)."

    This follows the previous $33.66 million that SpaceX was previously awarded as part of this program back in early 2016:

    http://www.spaceflightinsider.com/missions/defense/orbital-atk-spacex-awarded-contracts-u-s-air-force/
     
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  13. ecarfan

    ecarfan Well-Known Member

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    (bold emphasis placed by me)
    Oh, the irony...
     
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  14. adiggs

    adiggs Active Member

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    Apparently the expendability of the launch vehicle is optional :)
     
  15. RDoc

    RDoc S85D

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    What are you talking about? DOD says they're going to expend it, so that's it! What possible advantage would there be for DOD to do something like, say, reuse?:rolleyes:
     
  16. jgalak

    jgalak Member

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    Anyone know if those "1200 seconds of firing across 42 main engine tests" are on a full-scale Raptor or is this still the baby-Raptor?
     
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  17. Grendal

    Grendal Active Member

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    All testing has been done on the mini Raptor. I believe Elon just posted on his recent AMA that they just completed building a full scale Raptor. So we might be hearing news on testing for that in the next few months.

    I am not a rocket scientist but I've read from more knowledgeable people that upscaling in size is not that big a deal in rocket engines. Dangers come from getting the process correct over different sized parts. Personally, I was surprised by that. SpaceX has successfully tested the process so now they just scale it up to production size.
     
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  18. rabar10

    rabar10 FFE until Model 3

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    I think this has changed quite a bit in recent years, with computer modeling and finite element analysis that is able to accurately simulate rocketry combustion and flow dynamics. There is a video somewhere that describes SpaceX's detailed work in this area with the Merlin engine.
     
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  19. Grendal

    Grendal Active Member

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    Very cool stuff.
     
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  20. ecarfan

    ecarfan Well-Known Member

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    I won’t pretend I understand everything those two rocket scientists were trying to explain, but the overall concepts are pretty awesome! What year was that talk given, and where?
     
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