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Soyuz fueling
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Soyuz fueling
On Sunday, July 15, 2018 at 2:34:13 PM UTC-4, Jeff Findley wrote:
If you're going to launch (presumably hours) after fueling, keeping the LOX below the boiling point would be very difficult. Launch vehicles that do this typically let the LOX boil off and just continuously replenish with liquid oxygen to make up for the boil off. Most US launch vehicles have done it this way. SpaceX Falcon is the exception. They sub-cool the LOX to well below its boiling temperature to increase its density. Hence the "load and go" timing of LOX filling. "We sub-cool the oxygen and methane to densify it, so compared to... propellants normally used close to their boiling point in most rockets, in our case we actually load the propellants close to their freezing point, and that can result in a density improvement of up to around 10 to 12 percent, which makes an enormous difference in the actual results of the rocket." "It also makes the... it gets rid of any cavitation risk for the turbo pumps, and it makes it easier to feed a high pressure turbo pump if you have very cold propellant." https://space.stackexchange.com/ques...turbo-pumps-an |
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