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Questions tagged [fuel-system]

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11
votes
1answer
730 views

Why is the Space Shuttle's External Tank fuelled through the Orbiter's main engine plumbing system?

This answer states that Space Shuttle's External Tank (ET) was fuelled (this process is known as Tanking) through the Orbiter's main engine plumbing system with the Tail Service Masts (TSM). One ...
13
votes
1answer
2k views

How was the space shuttle fuelled?

How was the external fuel tank filled with LH2 and LOX while the shuttle was on the launch pad? I know there was a gaseous oxygen umbilical on the top of the ET and a gaseous hydrogen umbilical about ...
6
votes
2answers
2k views

Why do rocket engines use nitrogen actuators to operate the fuel/oxidiser valves instead of electric servos?

Why do rocket engines use nitrogen actuators to operate the fuel/oxidiser valves instead of using electric servos?
0
votes
1answer
65 views

Could LNG fuel be used to pressure feed itself into combustion chamber?

In pressure fed cycle a high pressure gas tank contents are exhausted into the fuel and oxidizer tanks to essentially push them into the combustion chamber. Could a portion of the fuel from an LNG ...
5
votes
0answers
205 views

Why can’t cryogenic propellants be storable, at least on the ground, via refrigeration?

Cryogenic fuels (liquid hydrogen, liquid methane)1 and oxidisers (liquid oxygen)2 are the rocket propellants of choice where raw performance is the overriding concern, due to the very high performance ...
19
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1answer
2k views

Is Asparagus Staging Possible

Sorry if this is the wrong place to ask this question, as its very much hypothetical. In the computer game Kerbal Space Program , there are 3 main Staging Options that are used Conventional Staging ...
5
votes
2answers
242 views

With pressure-fed engines, is any measurable thrust generated by venting the pressurant out the engine bell after flameout?

A pressure-fed rocket engine supplies fuel and oxidiser to the combustion chamber by pressurising the fuel and oxidiser tanks with an inert gas (typically helium or nitrogen). Presumably, when a ...
3
votes
0answers
52 views

How do current reusable boosters create fuel pressure for retro-burn? [duplicate]

For the SpaceX launches of the Falcon9 and Falcon Heavy, and also Blue Origin launch vehicles, the booster stage lands with a controlled decent and firing of main engines for retro-thrust. During ...
7
votes
3answers
1k views

Is Cassini running out of fuel?

In their (misleadingly titled) article NASA's Cassini probe dives into Saturn's atmosphere, CNN reports Once the final five orbits are complete, Cassini will plunge towards Saturn, with seven ...
1
vote
2answers
171 views

Does the Falcon Heavy also use a helium system?

The Falcon 9 uses a helium system to pressurize the tanks. Does the Heavy first stage also use helium? How big would the explosion be in case of a failure assuming the boosters would go too?
2
votes
1answer
373 views

Filling of LOX tanks - 'cryogenic geyser cycling'

This article about the 2016 Sept 1 Falcon 9 explosion mention 'cryogenic geyser cycling' in reference to the filling of the LOX tanks as though it were a particular method of filling tanks. In ...
19
votes
3answers
4k views

How was fuel crossfeed achieved, between the main tank and the Shuttle?

Whenever a fan of Kerbal Space Program mentions the super-efficient 'asparagus staging' in any professional context, the automatic response is 'That won't work. KSP fuel pipes are pure magic.' The ...
5
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3answers
4k views

Autogenous pressurization with sub-cooled propellant

In his IAC 2016 talk, Elon Musk said (at 28m 4s in the video) that the ITS booster tanks would use autogenous pressurization. This means there is gaseous oxygen resp. methane in the tank. To stay ...
7
votes
2answers
425 views

Does SpaceX recover and reuse tank pressurization helium?

Given that SpaceX have successfully landed several Falcon 9 boosters and that these vehicles use helium pressure-fed engines, when these vehicles land, their propellant tanks will presumably be mostly ...
6
votes
2answers
4k views

How is a rocket engine started?

I understand the basic principle of how a rocket engine works, but what I cannot find any info about is how do they initiate the whole process. Can someone please explain to me what gives the turbo-...
7
votes
1answer
2k views

How much does a hydrogen tank weigh compared to the hydrogen in it?

For the kinds of tanks used in upper stages, what is the ratio of the weight of the tank to the weight of the hydrogen? Are larger tanks more efficient? This is for considering transport of hydrogen ...
18
votes
3answers
7k views

Can we use interstellar hydrogen as a fuel for interstellar travel?

From my understanding, space is not entirely empty. Infact, between the voids of space are molecules or maybe individual atoms of hydrogen just floating around. I understand that gathering massive ...
12
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3answers
6k views

Were Space Shuttle External Tanks recoverable and reusable?

During the launch of STS vehicle, the two stage 0 Solid Rocket Boosters (SRB) were jettisoned and recovered after they gently parachuted into the ocean: But what happened with the STS External Tanks ...
6
votes
1answer
149 views

What temperature difference do the injectors in a cryo engine experience?

A quick follow-up to Does ISRO's Cryogenic Upper Stage have restart capability? What temperature difference do the injectors in a cryo engine experience between the propellant tank, and the ...