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Types Of Engines  
User currently offlineJAT From Canada, joined Feb 2000, 1101 posts, RR: 9
Posted (14 years 12 months 1 day 17 hours ago) and read 881 times:

What is the difference between a high by-pass ratio engine and a "regular" engine?

Thanks for the info.

4 replies: All unread, jump to last
User currently offlineJim From United States of America, joined Jul 1999, 455 posts, RR: 1
Reply 1, posted (14 years 12 months 1 day 16 hours ago) and read 829 times:

In a general definition, a high bypass turbofan engine will move more than 3 times the air through the cold stream than through the core.

JT8Ds are not high bypass fans, but they are a fan engine. CFM 56 and larger are true high bypass engines.


User currently offlinePurdue Arrow From United States of America, joined May 1999, 1574 posts, RR: 7
Reply 2, posted (14 years 12 months 1 day 14 hours ago) and read 822 times:

In a high bypass engine, the ratio of air that travels around the engine core (bypasses it) to the amount of air that flows through the engine core and is used for combustion is at least 5:1.

There was a previous discussion of this: Check it out

User currently offlineJAT From Canada, joined Feb 2000, 1101 posts, RR: 9
Reply 3, posted (14 years 12 months 21 hours ago) and read 806 times:

I assume this high by-pass engines are more powerfull?

User currently offline777x From United States of America, joined Dec 2014, 76 posts, RR: 0
Reply 4, posted (14 years 12 months 20 hours ago) and read 804 times:

because the air travelling around the engine (the bypass air) mixes with the high temp exhast from the engine core, reducing the temp and the velocity of the exhast, thereby reducing the noise as well.

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