Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!att!cbnews!military
From: tek@CS.UCLA.EDU
Newsgroups: sci.military
Subject: Turbo{jet,fan}s
Message-ID: <14242@cbnews.ATT.COM>
Date: 22 Feb 90 03:44:21 GMT
Sender: military@cbnews.ATT.COM
Organization: UCLA
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From: tek@CS.UCLA.EDU

Here is a question for you aero experts:

What are the important differences between turbojet and turbofan
airplane engines?

My limited understanding is that a turbofan is a turbojet with a
bypass added. So some of the air goes around the ignition area and
then rejoins the exhaust flow. Is there any other basic difference? 

Why is bypassing a "good thing"? What does it accomplish?

How does changing the "bypass ratio" affect the engine performance?

Does turbofan performance tend to be limited by different factors than
turbojet performance? 

-ted

Ted Kim                           
UCLA Computer Science Department  Internet: tek@penzance.cs.ucla.edu
3804C Boelter Hall                UUCP:    ...!{uunet|ucbvax}!cs.ucla.edu!tek
Los Angeles, CA 90024		  Phone:   (213) 206-8696