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Types Of Engines  
User currently offlineJAT From Canada, joined Feb 2000, 1101 posts, RR: 10
Posted (14 years 4 months 3 weeks 6 days 19 hours ago) and read 758 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 exactly 15 years ago today! , 455 posts, RR: 1
Reply 1, posted (14 years 4 months 3 weeks 6 days 19 hours ago) and read 706 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 May 1999, 1574 posts, RR: 8
Reply 2, posted (14 years 4 months 3 weeks 6 days 17 hours ago) and read 699 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: 10
Reply 3, posted (14 years 4 months 3 weeks 6 days ago) and read 683 times:

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

User currently offline777x From , joined Dec 1969, posts, RR:
Reply 4, posted (14 years 4 months 3 weeks 5 days 22 hours ago) and read 681 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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