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Results tagged with engine-design
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user 36625
Questions regarding the design or design process for a propulsion system.
2
votes
0
answers
108
views
Do smaller engines have a higher thrust to weight ratio?
For a given chamber pressure and shape,
thrust is proportional to nozzle area, which is proportional to the square of dimensions
mass is proportional to the volume, which is proportional to the cube …
0
votes
1
answer
124
views
How does SpaceX Raptor deliver a more benign turbine environment?
Raptor has been claimed to be able to deliver "long life ... and more benign turbine environments".
https://en.wikipedia.org/wiki/SpaceX_Raptor
The Raptor has hot oxygen flowing out of the oxidizer …
1
vote
1
answer
269
views
Can a spinning water film cool an engine cheaper and better than ablative?
Ablative cooling us an incredibly simple way to cool a liquid rocket engine, when compared to regenerative cooling. But ablatively cooled engines are (presumably) hard to refurbish.
Why not inject a s …
0
votes
0
answers
103
views
Can coking be avoided by pumping fuel after shutdown?
As I understand it, coking in kerolox engines occurs when the engine shuts down and fuel flow stops, causing fuel still in the coolant channels to overheat and decompose.
Can this problem.be avoided b …
6
votes
0
answers
240
views
How do spacecraft protect their engines from micrometeroids?
A meteoroid impact on an engine bell can easily rupture a coolant pipe. Or it can create an imperfection in the backing plate from where cracks can form. Or it can destroy an injector. All of these ca …
3
votes
1
answer
381
views
Why will the Raptor not face the same turnaround issues as Space Shuttle engines?
The RS-25's notoriously slow, expensive turnaround was blamed on its complexity. The Raptor appears about as complex.
Both use regenerative cooling.
Both use preburners to drive turbopumps.
While the …
4
votes
1
answer
808
views
SSME/RS-25: why seal between LOX pump and preburner?
Both the the fuel and oxidiser preburners ran fuel rich. In order to prevent the preburner gas from entering the LOX pump and blowing it up, they had this complex double seal with a gas purged void in …
2
votes
Accepted
How Intuitive Machines' engines "crank out unmatched performance in the space domain" allowi...
By "performance" they mean thrust, as opposed to ISP, as suggested in the comments. There are far more mass-efficient engines than theirs that are already in use eg: ion thrusters.
Their VR900 engine …
7
votes
2
answers
746
views
Does methalox fuel have a coking problem at all?
Methane was chosen for SpaceX Raptor because it has less coking problem that kerosene. But does it completely eliminate it? If not, how much less severe is it?
I googled 'thermal decomposition of meth …
2
votes
1
answer
132
views
How are combustion chamber baffles cooled?
Are they cooled the same way as the chamber walls, or do they somehow not require cooling?
5
votes
0
answers
196
views
Low-pressure pump-fed rocket engine?
I saw the above suggested in LEO on the Cheap. In P.130 it says:
A compromise between high-performance/lightweight pump-fed vehicle designs
and cost-optimized pressure-fed vehicles with heavier struc …