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Results tagged with turbofan
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user 24388
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.
2
votes
Does a trent 900 engine have the ability to spin extra or more fans?
A geared turbofan can spin a different fan at a different speed than an otherwise equivalent non geared engine. … But a geared turbofan does not have the ability to spin additional fans at the same rpm, or spin the same fan faster, than a non geared turbofan (if that's what you are asking?). …
- 4,543
12
votes
Why do turbofan engines not have a contrarotating second fan?
Pratt & Whitney have developed the geared turbofan, the PW1000G that first ran in 2008 and entered commercial use in 2016, flying on 4 different aircraft, including the Airbus A320neo. …
- 4,543
6
votes
Why is a contra-rotating High Pressure section more efficient?
These marketing type documents don't always mean "efficiency" in the true technical definition of the word, nor is it clear if they are talking about turbine stage efficiency (i.e. efficiency of the n …
- 4,543
1
vote
Turbofan design parameters
Your question doesn’t make complete sense, because to model the performance of an engine, you need a lot more parameters than the 3 listed. In addition, the first one can be calculated from the second …
- 4,543
1
vote
Why do jet engine fan blades have a twisted shape?
(Hot section) turbine blades are twisted (in the chord wise direction) because they are partially utilising reactive aero mechanical design, and impulse aero mechanical design. (The blade is also twis …
- 4,543
4
votes
Accepted
Why do compressors constrict flow if this decreases pressure?
Your understanding of Bernoulli's equation is correct, but the situation in a compressor is more complex, because energy is being added by the rotating blades.
When subsonic flow decreases in speed, …
- 4,543
3
votes
At what Mach Number do variable cycle engines (VCEs) start showing benefits over turbofans?
It's not a high Mach number that gives a variable cycle engine an advantage over a turbofan. … But lower fuel consumption in cruise occurs with a high bypass ratio turbofan. …
- 4,543
6
votes
Accepted
What is the operating temperature of a turbofan engine, and how is it kept at that temperature?
Q1: Assuming that by operating temperature you mean turbine inlet temperature, this article says the Pratt & Whitney F135 engine in the F-35 (JSF) has a TIT of 3600 °F (1982 °C / 2255 K), but that mos …
- 4,543
23
votes
Accepted
Which jet engines have the highest thermal efficiency?
Thermal efficiencies are very rarely quoted for aviation gas turbines. The metrics of interest are specific fuel consumption, and power to weight ratio. While a higher thermal efficiency will increase …
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