All Questions
10 questions
0
votes
2
answers
144
views
How do tubojets compare to afterburning turbofans in terms of efficiency?
Turbojets used to be more common in the 40's and 50's but once jet engine design matured they pretty much went extinct in favor of the more efficient turbofan. I know one advantage of the turbojets is ...
- 41
0
votes
1
answer
127
views
Why do we take into consideration holes for pressure thrust in jet engine calculations?
In many sources related to jet engine thrust calculations such as https://www.jet-x.org/a8.html ,
pressure thrust of a module such as combustion chamber, nozzle or compressor, is calculated by front ...
- 244
1
vote
1
answer
455
views
Do compressors and turbines in jet engines end with rotor or stator?
I am trying to understand compressor and turbine design principle based on stators and rotors.
I know that turbines and compressors both have a rotating and fixed section that constitute a stage.
For ...
- 244
1
vote
2
answers
469
views
Why are inlet and outlet (exhaust) pressure considered to be the same in a turbojet engine?
Why do we take outlet/exhaust pressure (station 6) as the same as in inlet (station 1) ?
In T-S diagram, we see that outlet temperature is much higher than inlet temperature since flow in outlet has ...
- 244
5
votes
3
answers
4k
views
How come a turboprop can't reach speeds as high as a turbofan?
I understand that turbofan powered aircraft can reach much faster speeds than turboprops like the C130 Hercules, and I can't imagine a turbofan turboprop powered 737 would be of any use really, but as ...
- 51
2
votes
2
answers
2k
views
Do jet fighters use Turbojet engines, and do cargo/passenger aircraft use Turbofan engines? [duplicate]
I have a feeling that Turbofan engines are used in jet fighters and Turbojet engines are used in cargo or passenger aircraft.
Is my perception correct?
Do jet fighters use Turbojet engines?
Do cargo/...
- 886
7
votes
1
answer
3k
views
What causes the horn-like noise during the start-up of some jet engines?
Here's the specific sound I'm talking about (it starts specifically 56 seconds into the video, as well as at 2:02 for the second engine):
I've only really heard that ...
- 73
1
vote
0
answers
218
views
How do the contrarotating turbines work in the F-119-PW-100?
I was reading about the F22 Raptor and found out that its powerplants use contrarotating turbines. How does this work
Also, if the spools and their connected compressors are rotating in opposite ...
- 11
19
votes
1
answer
20k
views
Which jet engines have the highest thermal efficiency?
Some automakers (Mercedes-Benz, Toyota) have recently been making news about the improved thermal efficiency of their engines, stating that they reached the 50% mark. I was wondering if it was the ...
- 922
6
votes
2
answers
2k
views
Are there turbofan/turbojet analogues to a centrifugal-compressing jet engine?
Axial-compressor jet engines fall into two categories (and only two as far as I'm aware): turbofan and turbojet. I'm wondering if centrifugal-compressor jets also have such a distinction or something ...
- 17.9k