Citaat:
Oorspronkelijk geplaatst door kojak
En dan nog.
De combinatie H2 & Kerosine is nu de meest gebruikte brandstof.
H2 als brandstof leek blijkbaar veel belovender dan dat ze eerst was.
'.. What is the Best Rocket Fuel
Again it depends. The story is much the same as for rocket engines. Do you want high trust of high efficiency? Hydrogen gives high efficiency, or more specifically high specific impulse, but Kerosene gives more thrust. Why is that? Kerosene is 18 times denser than hydrogen which means more fuel can get pumped through the turbo-pump and into the combustion chamber. So that gives lots of thrust but it also means you burn it up faster. Hydrogen gives more energy relative to weight, so you can keep going for longer. In other words it gives better milage.
For this reason first stage rocket engines which need to escape the gravity of a planet, are better off using big high trust rocket engines with kerosene, while upper stages being used in outer space can be smaller and use hydrogen.
Also hydrogen is a highly problematic fuel. If we used it in the first stage, it would make the rocket enormous because the fuel tanks need to be so big. Additionally it needs to be cryogenically cooled and the bigger the tanks are, the thicker he walls need to be, making everything heavier. This makes hydrogen a poor choice for first stage...'
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Euh...
Space X raketten vliegen met vloeibare zuurstof (LOX) en Kerosine RP-1
Citaat:
https://en.wikipedia.org/wiki/Liquid...nt#Present_use
Present use
As of 2018, liquid fuel combinations in common use:
Kerosene (RP-1) / Liquid Oxygen (LOX)
Used for the lower stages of the Soyuz boosters, and the first stage of the U.S. Saturn V, Atlas, and Falcon 9 boosters. Very similar to Robert Goddard's first rocket.
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https://en.wikipedia.org/wiki/Liquid_oxygen
SpaceX is in 2016 ermee begonnen die LOX te gebruiken met enkele probleempjes:
Citaat:
https://www.youtube.com/watch?v=EjbIRi7FzyU
SpaceX Uses A Different Rocket Fuel From Anyone Else — That Could Be A Problem
Am 09.01.2017 veröffentlicht
For nearly a year, SpaceX has been trying out something new: super-cooling the liquid oxygen (LOX) which is a key ingredient in rocket fuel. It's called deep-cryo LOX, and the idea has been around since NASA began designing rockets in the first half of the 20th century. But no one has had the guts to actually fly rockets regularly with deep-cryo LOX.
We spoke with associate professor of aerospace engineering at Georgia Tech, Mitchell Walker, to understand why SpaceX chills its LOX cooler than anyone else and whether or not this is a good idea.
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En Space X was de eerste die LOX
zo diep koelde, -340 F:
Elon Musk?
Geverifieerd account
@elonmusk
Als antwoord op @PaigeANjax
@PaigeANjax
-340 F in this case. Deep cryo increases density and amplifies rocket performance. First time anyone has gone this low for O2.
17:34 - 17 dec. 2015