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Results tagged with rockets
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user 511
Questions regarding the boosters or thrusters used to propel man-made objects. For rockets firing opposite the primaries, see [retrorockets]. See wiki for other related tags.
3
votes
1
answer
343
views
Why does the exhaust plume apprear to be throbbing?
Here is a cropped video of the space shuttle exhaust. There appears to be some throbbing/oscillatory behaviour to the exhaust plume.
It is often visible along with an intensity changes/fluctuation i …
- 4,489
13
votes
1
answer
1k
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Why does the 2nd stage of Falcon 9 need compressed He tanks?
It is well known that the rapid disassembly of Falcon 9 static testing started with the rupture of the composite fibres of the copv He tanks.
But what is the need to have the composite tanks constrai …
- 4,489
5
votes
1
answer
189
views
Why NASA hosts many of their reports public, while ESA/JAXA/ Roscomos doesn't?
There are abundant resources available online in NTRS about the hard earned knowledge of rocket science. But NASA makes them available for free for all.
But there does exist some classified document …
- 4,489
2
votes
1
answer
1k
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Why spray LOx into combustion chamber, if GOx is more effective?
Are there any issues in transforming the liquid oxygen into gaseous oxygen before injecting into the combustion chamber?
Gaseous Oxygen will be readily available for combustion and will mix well with …
- 4,489
2
votes
0
answers
105
views
Effect of the location of igniter in starting liquid rocket engine
What will be the effect of off axis igniter, say a Spark igniter has to be used along with a pintle? Will the igniter being off axis have any effect on engine start?
Also, will an off-center igniter …
- 4,489
3
votes
0
answers
336
views
How are the liquid propellant umbilical cord protected from the exhaust?
The launch pad umbilical cords supply propellant to the rocket, and will definitely have some remaining at the time of liftoff.
I remember the Saturn V footage wherein a heavy protection door slams …
- 4,489
3
votes
1
answer
131
views
At which stage of rocket development does systems engineering become critical/useful? [closed]
Rockets are complicated system and the interaction of the sub-systems are even more complicated. …
- 4,489
2
votes
2
answers
476
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Why are LOx plumbing not insulated?(ref: Huzel and Huang)
In the book Modern Engineering for Design of Liquid Propellant Rocket Engines, the following excerpt appear in chapter 9 - Interconnecting Components and Mounts:
The liquid-oxygen lines were not i …
- 4,489
2
votes
0
answers
263
views
Why does the PSLV first stage's exhaust plume turn to bluish at high altitude?
After few seconds, post liftoff(anywhere between 60s and 90s), the exhaust plume of PSLV turns into a bluish colour. This is quite evident in night launches than day launches(obviously because the bri …
- 4,489
7
votes
3
answers
6k
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Why is Adiabatic wall temperature taken as the driving temperature in rocket engines?
Going by the definition of convective heat transfer coefficient from Wikipedia (which I have started to doubt; reason follows):
$h=\frac{q}{\Delta T}$, where the $\Delta T$ is taken as the difference …
- 4,489
20
votes
2
answers
4k
views
Where does the thrust act in a rocket engine and how is it transferred to rocket structure?
A rocket engine is basically a device that generates a high pressure inside the chamber and the pressure difference creates a force.
A nozzle helps in effectively accelerating the flow and increases …
- 4,489
4
votes
0
answers
92
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Why doesn't a regeneratively cooled engine crack due to differential expansion induced by th...
A liquid rocket engine with regeneratively cooled chamber walls and nozzles would definitely be one among those components experiencing the steepest thermal gradients (Chamber wall inner - $3000 K$ an …
- 4,489