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Types Of Engines  
User currently offlineJAT From Canada, joined Feb 2000, 1095 posts, RR: 10
Posted (13 years 2 months 3 weeks 1 day 16 hours ago) and read 523 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 (13 years 2 months 3 weeks 1 day 15 hours ago) and read 471 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.

Jim

User currently offlinePurdue Arrow From United States of America, joined exactly 14 years ago today! , 1574 posts, RR: 8
Reply 2, posted (13 years 2 months 3 weeks 1 day 13 hours ago) and read 464 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, 1095 posts, RR: 10
Reply 3, posted (13 years 2 months 3 weeks 20 hours ago) and read 448 times:

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

User currently offline777x From , joined Dec 1969, posts, RR:
Reply 4, posted (13 years 2 months 3 weeks 19 hours ago) and read 446 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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