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Turbofan question

 
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jjuutinen



Joined: 13 Jul 2003
Posts: 180

PostPosted: Wed Feb 01, 2006 19:42    Post subject: Turbofan question Reply with quote

Question: assuming constant TIT at which bypass ratio the bypassed air starts producing more thrust than the combustion gases?
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jschauer



Joined: 19 May 2004
Posts: 89
Location: Justin, Texas

PostPosted: Fri Feb 03, 2006 10:06    Post subject: Reply with quote

I contacted one of our powerplant engineers about that question. It may be a few weeks before I get an answer. I'm using a GE CF6-80C engine as an example.
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jschauer



Joined: 19 May 2004
Posts: 89
Location: Justin, Texas

PostPosted: Sat Feb 11, 2006 21:30    Post subject: Reply with quote

OK here's the answer. I contacted our Lead powerplant engineer and this is what he said in regards to a GE CF6-80C.
"The CF6 engine is a high bypass fan engine. 80% of the thrust is produced by the 1st stage fan, while 20% comes from the core through the low pressure turbine. The question of at what point the fan produces more thrust than the core is a very difficult, if not impossible, question to answer. There are too many variables such as atmospheric conditions and engine efficency that would have an affect. At idle, the fan is already producing more thrust than the gases produced through the core."
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