New answers tagged turbine
6
votes
Accepted
What is the purpose of variable stator vanes in the power turbine part of a free shaft gas turbine?
When you take a turboshaft engine and subject it to large and sudden load changes, that it doesn't have to cope with in an aircraft, like during gear ratio changes in a tank, you get very sudden ...
- 117k
2
votes
Accepted
How do gas turbine engines and turbofan engines keep constant compressor side rpm?
ALL these engines will runaway, if load is abruptly removed
What keeps RPM at sensible numbers is that usable power (load) is kept balanced with the fuel supplied.
There are a number of X-factors ...
3
votes
Accepted
Why is the turbine that drives the compressor is placed before the free turbine in a gas turbine engine?
The compressor-turbine spool, the "gas generator" in turboprop/turboshaft lingo, or "core engine", in a turbofan, has to come ahead of the power turbine because the turbine has to ...
- 117k
0
votes
Why is the turbine that drives the compressor is placed before the free turbine in a gas turbine engine?
The "compressor turbine" is the turbine (or group of turbines) which extract from the exhaust enough energy to drive the compressor stages, nothing more.
The remaining energy possessed by ...
- 6,026
1
vote
How do gas turbine engines and turbofan engines keep constant compressor side rpm?
With car engines, the connection between car speed and engine speed is stiff, and only changed by changing gears or operating the clutch. So a car engine need to change rpm often to adapt to car speed ...
- 111
10
votes
How do gas turbine engines and turbofan engines keep constant compressor side rpm?
The reason that car piston engines and turbine engines seem to behave differently is that they're used in different ways.
If ran at full throttle with no load, both types of engine would accelerate to ...
- 11.9k
2
votes
How do gas turbine engines and turbofan engines keep constant compressor side rpm?
Pretty early on in the development of jet engines they realized that it was necessary to limit fuel to prevent runaway RPM. For this reason RPM is governed by a Fuel Control Unit that meters fuel ...
- 21.7k
6
votes
How do gas turbine engines and turbofan engines keep constant compressor side rpm?
In a car, you virtually-always operate with the engine far below its power-limited RPM; this is usually not the case in a jet-engined airplane.
In both a piston-engined car and a jet-engined airplane, ...
- 27.5k
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