Jim From United States of America, joined Jul 1999, 455 posts, RR: 1
Reply 1, posted
Tue Mar 7 2000 02:52:24 UTC (14 years 5 months 2 weeks 5 days 11 hours ago) and read 713 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.
Purdue Arrow From United States of America, joined May 1999, 1574 posts, RR: 8
Reply 2, posted
Tue Mar 7 2000 05:07:12 UTC (14 years 5 months 2 weeks 5 days 8 hours ago) and read 706 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
JAT From Canada, joined Feb 2000, 1101 posts, RR: 10
Reply 3, posted
Tue Mar 7 2000 22:08:47 UTC (14 years 5 months 2 weeks 4 days 15 hours ago) and read 690 times:
I assume this high by-pass engines are more powerfull?
777x From , joined Dec 1969, posts, RR:
Reply 4, posted
Tue Mar 7 2000 23:23:55 UTC (14 years 5 months 2 weeks 4 days 14 hours ago) and read 688 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.