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Results tagged with engine-design
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user 24388
Questions about the process and principles used when designing aircraft engines. Use "jet-engine" and "piston-engine" tags to specify a certain type of engine.
13
votes
Why are there fewer stages in the turbine than in the compressor of a turbine engine?
Very simply, a turbine has fewer stages than the compressor, because the flow in the turbine is going in the direction of reducing pressure - the air wants to go that way naturally. But a compressor h …
- 4,543
8
votes
How do engine manufacturers derive varying amounts of thrust from a single engine model?
The CF34-3and CF34-10E are quite different engines. The -10 produces more thrust for a number of reasons:
It has a higher mass flow. The CF34-3 has a 44 inch fan, while the -10E has a 54 inch fan. So …
- 4,543
7
votes
Accepted
What is the difference between single and dual annular combustor?
Here's an engine with old combustor cans:
Here's a single annular combustor:
And in cross section:
And now here's a dual annular combustor (DAC) (pic from here) in cross section:
See how …
- 4,543
15
votes
Why does the B-52 outboard engine nacelle have a sharp change in shape?
A lot of pictures of this intake make it quite hard to determine what is the exact geometry. But the one below is by far the best - thank you @ymb1.
http://www.af.mil/News/Photos/igphoto/2001513002 …
- 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
27
votes
What is this hole at the front of the engine pylon on a Boeing 707?
Wikipedia tells you the answer:
The 707 uses engine-driven turbocompressors to supply pressurized air for cabin pressurization. On many commercial 707s, the outer port (number 1) engine mount is dis …
- 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. Most air-to-air combat happens at subsonic speeds, because drag gets very high when you start trying to tur …
- 4,543
3
votes
What is the difference between active tip clearance control system and passive tip clearance...
This is kind of half an answer, but the difference between active tip clearance control and passive tip clearance control is in the definition of “active” and “passive”. An active system has some way …
- 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 …
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