Linked Questions

16
votes
10answers
7k views

Can hydrogen gas be an alternative fuel source for a gas turbine engine?

I want to do research for an alternative fuel source for a commercial aircraft that will reduce the cost for flights. Will the hydrogen gas be ignited in the combustion chamber and produce enough ...
36
votes
4answers
16k views

Why do gases in the combustion chamber only flow one direction to the gas turbine in a jet engine?

As far as I know from the working principle of jets engines, compressed air in the combustion chamber (or combustion canister) is mixed with fuel. The ignited mixture expands backwards to turn the ...
24
votes
6answers
7k views

In what way are the Concorde's engines considered efficient?

The Concorde is powered by a bunch of Rolls-Royce/Snecma Olympus 593 turbojet engines. Much has been said about how efficient they are at speed, and the fact that they allow long-range cruise at Mach ...
17
votes
3answers
4k views

Can high-bypass turbofans cruise at high altitude?

They have talked for years about re-engining the B-52 with something more modern than its TF33-P-3/JT3D turbofans, which are fairly low-bypass (1.42:1 for the JT3D). Modern engines are much higher ...
9
votes
2answers
2k views

What keeps an aircraft engine from flaming out at high altitude?

High altitude atmosphere has lower oxygen level. How do aircraft, especially the military ones, prevent engine flameout?
4
votes
2answers
4k views

What is the absolute velocity change through compressor+burner?

I thought that the velocity going through a turbojet increased as it went through the compressor and the burner. Intuitively, if the pressure/enthalpy increases, so would the velocity, right? I came ...
7
votes
1answer
1k views

How is flame stabilisation carried out?

How is flame stabilization done in a jet engine combustion chamber? What are the various ways of doing this? What are the challenges/ problems faced?
7
votes
1answer
743 views

What is high altitude testing?

When new engines are designed for aircraft (military or civilian) they undergo high altitude testing (especially the military ones). What is high altitude testing of engines? How is that important?
2
votes
2answers
773 views

Why do supersonic planes fly higher than subsonic airliners? [duplicate]

I saw on wiki that a boeing 737 flys at about 38,000ft and a Concorde flys at 60,000ft. What made it possible, and advantageous, for Concorde to fly so much higher?
1
vote
0answers
211 views

Why is the F-16's service ceiling 50,000ft? [duplicate]

What defines the service ceiling for aircraft, in particular the F-16? I suppose, as with almost everything, this depends on the aircraft, the engine type, etc. While I'm fine with a comprehensive ...