Questions about the various methods used to propel aircraft.
Questions tagged [propulsion]
103 questions
14
votes
3 answers
How does turbojet thrust change with altitude?
I am studying the rate of climb of turbojets, I don't know how the thrust varies with altitude and in particular which are the differences between necessary thrust and effective thrust.
Hope being clear, I can't translate properly maybe so ask and…
Davide
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6
votes
2 answers
Would injecting water into a jet engine’s exhaust increase velocity?
Can high pressure mist of water be sprayed into jet engine exhaust, to create steam, to increase velocity? Would the steam generated from high pressure water being injected into the jet engine exhaust increase velocity?
Tom Daily
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4
votes
1 answer
When is jet engine thrust maximum?
Assuming we have a convergent nozzle I've read that the maximum thrust is achieved just in the moment the nozzle exit -minimum area- is chocked, i.e., the nozzle is adapted in the sense the pressure in the exit area equals the ambient pressure. How…
XF-91
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1
vote
1 answer
Where does this integral for a 'aerospike nozzle' come from?
Today I was reading about the aerospike nozzle and found this image:
(from section 10.3.1 of this lecture)
This image tells us how to measure the thrust of this kind of nozzle. I can understand all of it except this part:
Where does this integral…
Roh
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0
votes
0 answers
Do aircraft using the push pull configuration always use the same engine?
I am currently doing research for a “white paper design” aircraft and I have always been interested in push pull aircraft as they seem to be rare and I wanted to see some challenges in making a very crude and college level aircraft. What I have been…
Aidan.T
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0
votes
1 answer
How does one determine the freestream and ultimate slipstream velocities to estimate thrust?
The task before me is estimating the thrust of a propulsion system (a ducted fan) using this equation for thrust (Eq. 2.1.1)1:
$$T = (mass\; flow\; rate)\;(slipstream\; velocity - freestream\; velocity) $$
I know what the ideal inlet and exit…
David Walden
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