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Results tagged with turbofan
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user 33692
A type of jet engine which uses two different airflow streams (one passing through the core and another blown past it by a fan) for obtaining thrust.
6
votes
Can a turbofan run without the fan to provide power without thrust?
No, the fan is directly connected to the outer compressor and turbine (N1). There is no direct connection to the inner compressor and turbine (N2), which could run independently, but there is no switc …
- 58.3k
14
votes
Accepted
Why does the takeoff N1 limit start to decrease below 30°C OAT?
What you see is called a flat rated engine. It means the maximum thrust from the engine is constant below the flat rated temperature (usually 30°C). Above that temperature, thrust will decrease due to …
- 58.3k
42
votes
Accepted
Are large jet turbofans so easy to spin?
Yes, large turbofans can be turned by hand without too much force. On smaller aircraft this is regularly done as part of the preflight walkaround. You can see an example in this YouTube video of an A3 …
- 58.3k
4
votes
What is the relation between N1 and Wing anti-ice
When engine or wing anti-ice are needed, the required amount of bleed air increases. In order to provide enough bleed air at the required pressure, the engine idle speed must be increased. That way, t …
- 58.3k
7
votes
Accepted
Why do some Turbofan engines have multi-stage fans?
These engines need a low bypass ratio: Why do military turbofan engines use a low bypass ratio? … (SKYbrary - Turbofan Engine)
In principle, high bypass ratio engines where more air is accelerated less are more efficient and therefore used on modern airliners, but they are not suited for supersonic …
- 58.3k
14
votes
Accepted
Are the A380 engines interchangeable (given they are not all equipped with reverse)?
The Airbus A380 comes with two engine choices:
Rolls-Royce Trent 900
Engine Alliance GP7000
The thrust reversers are not part of the core engines. The reversers are developed by the company which …
- 58.3k
20
votes
Accepted
How does the bypass air provide thrust?
The bypass air is accelerated by the fan at the front of the turbofan engine. … How much will depend on the bypass ratio of the engine and other parameters, but 80% is plausible for a high bypass turbofan. Bernoulli's principle has nothing to do with this. …
- 58.3k
-1
votes
What is the fuel/air ratio of the CFM56-5A1 engine (in the A320 model)?
The ratio can be different for different phases of flight. It is easy to calculate for the Takeoff (TO) case because the required numbers are easily available:
TO Thrust: $ 25 \, 000 \, \text{lbs} $ …
- 58.3k